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Автор: Grafiati
Опубліковано: 30 липня 2022

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1

TAKEISHI, Hiroyuku, Noboru NAKAYAMA, and Hiroyuki MIKI. "Consolidation with Grain Refinement by Compression Shearing Method under Room Temperature." Journal of the Society of Materials Science, Japan 54, no. 3 (2005): 233–38. http://dx.doi.org/10.2472/jsms.54.233.

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2

Nakayama, Noboru, Hayato Inoue, Hideharu Kusunoki, Masaomi Horita, Yoshitaka Kumeda, and Keishi Nakamura. "Effect of Shearing Distance on Mechanical and Electrical Properties for Cu-11Mn-4Ni Thin Plate Formed by Compression Shearing Method at Room Temperature." Materials Science Forum 941 (December 2018): 1517–22. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1517.

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ince the temperature coefficient of resistance of Manganin (Cu-12Mn-2Ni) is extremely small, Manganin plate are used for resistors, especially shunts for current sensing.Generally, the melting and casting is used as a method to make an alloy such as Manganin. Further, the Manganin used as resistive material is produced by rolling after casting. Since such manufacturing processes have heating steps, long molding time is necessary and temperature control is important.In recent years, Cu-11Mn-4Ni powder has been developed. If manganin plate can be produced directly from alloy powder, simplification of the manufacturing process can be expected. A powder metallurgy is used as a method of solidifying and shaping the alloy powder. However many pores are generated in the sample because of using a binder. Therefore, the resistance value of the alloy fabricated through the method may not be stable.The Compression Shearing Method at Room Temperature (COSME-RT) is one of solutions to achieve the high density forming. In COSME-RT alloy powders are simultaneously loaded by a shearing force and a compressive stress in air at room temperature to form a plate. In the process, temperature control is unnecessary and the manufacturing time becomes shorter.In the present study, the fabrication of Cu-11Mn-4Ni plate is carried out by compression shearing method at room temperature and mechanical and electrical properties of the plate are evaluated.
3

Saito, Tetsuji, Hiroyuku Takeishi, and Noboru Nakayama. "New method for the production of bulk amorphous materials of Nd–Fe–B alloys." Journal of Materials Research 20, no. 3 (March 1, 2005): 563–66. http://dx.doi.org/10.1557/jmr.2005.0098.

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We report a new compression shearing method for the production of bulk amorphous materials. In this study, amorphous Nd–Fe–B melt-spun ribbons were successfully consolidated into bulk form at room temperature by the compression shearing method. X-ray diffraction and transmission electron microscopy studies revealed that the amorphous structure was well maintained in the bulk materials. The resultant bulk materials exhibited the same magnetic properties as the original amorphous Nd–Fe–B materials.
4

HORITA, Masaomi, Noboru NAKAYAMA, Hiroyuki MIKI, Takamichi MIYAZAKI, and Hiroyuku TAKEISHI. "Microstructure of Titanium Thin Plates Formed by Compression Shearing Method at Room Temperature." Journal of the Japan Society for Technology of Plasticity 54, no. 625 (2013): 186–90. http://dx.doi.org/10.9773/sosei.54.186.

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5

Sakuma, Tomoya, Noboru NAKAYAMA, Hiroyuki MIKI, and Hiroyuku TAKEISHI. "0601 Creation of CuZn by the compression rotation shearing method under room temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2013.50 (2013): 060101–2. http://dx.doi.org/10.1299/jsmehs.2013.50.060101.

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6

MIKI, Hiroyuki, Yuta KAWASAKI, Sho TAKEDA, Hiroyuki KOSUKEGAWA, and Toshiyuki TAKAGI. "Consolidation of dissimilar metal composite materials by Compression Shearing Method at Room Temperature." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): J0440101. http://dx.doi.org/10.1299/jsmemecj.2016.j0440101.

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7

Matsuura, Toru, and Noboru Nakayama. "312 Development of SKD/MoS2 Composite materials by Compression Revolution Shearing Method under Room Temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2010.47 (2010): 105–6. http://dx.doi.org/10.1299/jsmehs.2010.47.105.

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8

ABE, Shintaro, Masaomi HORITA, Noboru NAKAYAMA, Kousuke OKAZAWA, Shintaro TANAKA, Yoshihiro TSUCHIYA, Eisuke SUZUKI, and Hiroyuku TAKEISHI. "0915 Mechanical properties of Ti/VGCF composite material by Compression Shearing Method at Room Temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2012.49 (2012): 091501–2. http://dx.doi.org/10.1299/jsmehs.2012.49.091501.

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9

TAKEDA, Sho, Hiroyuki MIKI, Noboru NAKAYAMA, Hiroyuki TAKEISHI, and Toshiyuki TAKAGI. "J1110104 Tribological Behavior of MoS_2-dispersed Composite Formed by Compression Shearing Method at Room Temperature." Proceedings of Mechanical Engineering Congress, Japan 2014 (2014): _J1110104——_J1110104—. http://dx.doi.org/10.1299/jsmemecj.2014._j1110104-.

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10

Nakayama, Noboru, Shota Sakagami, Masaomi Horita, Hiroyuki Miki, Ayaka Takahashi, and Keizo Hashimoto. "Fabrication of WS2-Dispersed Al Composite Material by Compression Shearing Method at Room Temperature." Key Engineering Materials 622-623 (September 2014): 1066–74. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.1066.

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In this study, WS2-dispersed Al composite material was fabricated by Compression Shearing Method at Room Temperature, using various WS2content ratios. The mechanical and friction properties of the WS2-dispersed Al composites were measured. As a result, the density measurements showed that the compacted WS2-dispersed aluminum composite had a relative density of 95 to 99%. Tensile strength of WS2-dispersed Al has 200 MPa. The friction coefficient of Al/0.5vol.%WS2was 0.14, a reduction of 83%, in comparison with the 1.0 friction coefficient of the pure Al matrix material. The addition of WS2to the matrix systems used reduced the friction coefficient. Therefore, WS2-dispersed Al composite material is useful for maintenance-free material of slide member.
11

TAKEDA, Sho, Hiroyuki MIKI, Takamichi MIYAZAKI, and Toshiyuki TAKAGI. "J0440404 Consolidation and Friction Properties of Self-lubricating Composite Materials by Compression Shearing Method at Room Temperature." Proceedings of Mechanical Engineering Congress, Japan 2015 (2015): _J0440404——_J0440404—. http://dx.doi.org/10.1299/jsmemecj.2015._j0440404-.

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12

Nakayama, Noboru, M. Horita, H. Miki, T. Takagi, and H. Takeishi. "Mechanical and Electrical Properties of Carbon Nanofiber Dispersed Ti Composite Formed by Compression Shearing Method at Room Temperature." Materials Science Forum 783-786 (May 2014): 2485–90. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2485.

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The materials used for fuel cell separators require a bending strength of more than 70 MPa. Therefore, the contact resistance is required to be 10 mΩ∙cm2, respectively. In the present study, vapor grown carbon nanofibers (VGCF) were added to Ti composite using the compression shearing method at room temperature. The mechanical properties of the compacted powder were then measured. The microstructure of the Ti/VGCF composite material was Ti with dispersed VGCF (not alloyed). In addition, the bending strength of all Ti/VGCF composites was more than 800 MPa, and the bending strength of 0-1 vol% VGCF composites was twice as much as that for Ti rolled material (ASTM grade 2). Ti/VGCF thin plates also exhibited excellent electrical property. The contact resistance of 5 vol% VGCF was found to be three times smaller than that of Ti rolled material. These properties make the Ti/VGCF composite material suitable as a separator material.
13

Takeda, Sho, Hiroyuki Miki, Hiroyuku Takeishi, and Toshiyuki Takagi. "Cu-Based MoS2-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature." Tribology Online 12, no. 2 (2017): 29–36. http://dx.doi.org/10.2474/trol.12.29.

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14

Nakayama, Noboru, S. Kato, Hiroyuku Takeishi, and Hiroyuki Miki. "Consolidation of Ti Powder by a Compression Rotation Shearing System at Room Temperature - Effect of Pivot Rotation Speed on Consolidation." Advanced Materials Research 409 (November 2011): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.409.3.

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Ti has high strength, good corrosion resistance, is lightweight and shows good biocompatibility. It has thus been used extensively for mechanical and medical structural components. On the other hand, the disadvantages of Ti include a high melting point, ease of oxidization at high temperatures, low specific heat and low thermal conductivity. There are three specific problems associated with Ti metallurgy. The first is that powder metallurgical processing requires high temperatures and a high vacuum, the second is that samples produced by existing powder metallurgy techniques have a low density, and the third is the occurrence of burning because of a local temperature rise during the cutting process. Therefore, in the present work, a new high-speed, room-temperature molding process involving compression rotation shearing was developed. This method can be used for solidification of metal powders by enforced plastic flow and breaking of oxide films. Therefore, no external heat is required and the molding time is short. The proposed method represents an easy approach to consolidating high melting point metallic materials.
15

Miki, Hiroyuki, Eijiro Abe, Sho Takeda, Makoto Ohtsuka, and Manfred Kohl. "Metamagnetic Shape Memory Alloy Thin Plates Consolidated by Compression Shearing Method at Room Temperature for Thermal Energy Harvesting Device." Sensors and Materials 32, no. 8 (August 31, 2020): 2867. http://dx.doi.org/10.18494/sam.2020.2938.

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16

NAKAYAMA, Noboru, Masaomi HORITA, Hiroyuki MIKI, Takamichi MIYAZAKI, and Hiroyuku TAKEISHI. "Effects of Powder Size and Shape on Microstructure of Al Thin Plate Formed by Compression Shearing Method at Room Temperature." Journal of the Japan Society for Technology of Plasticity 54, no. 625 (2013): 191–95. http://dx.doi.org/10.9773/sosei.54.191.

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17

KATO, Akira, Noboru NAKAYAMA, Hiroyuki MIKI, and Hiroyuku TAKEISHI. "0917 Effect of Particle Size on Mechanical Properties in Pure Aluminum Sheet Formed by Compression Shearing Method at Room Temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2012.49 (2012): 091701–2. http://dx.doi.org/10.1299/jsmehs.2012.49.091701.

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18

HORITA, Masaomi, Noboru NAKAYAMA, Hiroyuki MIKI, Takamichi MIYAZAKI, and Hiroyuku TAKEISHI. "Effect of Ball-Milling Time on Tensile Properties of Ti/Al Thin Plate Formed by Compression Shearing Method at Room Temperature." Journal of the Japan Society for Technology of Plasticity 54, no. 625 (2013): 181–85. http://dx.doi.org/10.9773/sosei.54.181.

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19

Nakayama, Noboru, Masaomi Horita, Shota Sakagami, Hiroyuki Miki, Takamichi Miyazaki, and Hiroyuku Takeishi. "Effect of Powder Shape and Size on Mechanical Properties of Al Thin Plate Formed by Compression Shearing Method at Room Temperature." Procedia Engineering 81 (2014): 1163–68. http://dx.doi.org/10.1016/j.proeng.2014.10.282.

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20

HORITA, Masaomi, Noboru NAKAYAMA, Keita MISAWA, Eisuke SUZUKI, Yoshihiro TSUCHIYA, Hiroyuki MIKI, and Hiroyuku TAKEISHI. "0916 Effect of mechanical milling time on tensile properties of Ti/Al thin plate formed by Compression Shearing Method at Room Temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2012.49 (2012): 091601–2. http://dx.doi.org/10.1299/jsmehs.2012.49.091601.

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21

Takeda, Sho, Hiroyuki Miki, Julien Fontaine, Hiroyuku Takeishi, and Toshiyuki Takagi. "Role of MoS2 Addition in the Consolidation of Metal from Powder to Plate by the Compression Shearing Method at Room Temperature." Tribology Online 13, no. 1 (2018): 15–19. http://dx.doi.org/10.2474/trol.13.15.

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22

IZAWA, Naoki, Noboru NAKAYAMA, Naoto SAITO, Hiroyuki MIKI, and Hiroyuku TAKEISHI. "1205 Development of Biomaterials formed by Compression Shearing Method at Room Temperature for Titanium fiber : Effects of Changing the Aspect ratio on the Strength Property of Titanium fiber." Proceedings of Conference of Hokuriku-Shinetsu Branch 2012.49 (2012): 120501–2. http://dx.doi.org/10.1299/jsmehs.2012.49.120501.

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23

Lara, Antoni, Mercè Roca, Sergi Parareda, Núria Cuadrado, Jessica Calvo, and Daniel Casellas. "Effect of Sandblasting on Low and High-Cycle Fatigue Behaviour after Mechanical Cutting of a Twinning-Induced Plasticity Steel." MATEC Web of Conferences 165 (2018): 18002. http://dx.doi.org/10.1051/matecconf/201816518002.

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In the last years, car bodies are increasingly made with new advanced high-strength steels, for both lightweighting and safety purposes. Among these new steels, high-manganese or TWIP steels exhibit a promising combination of strength and toughness, arising from the austenitic structure, strengthened by C, and from the twinning induced plasticity effect. Mechanical cutting such as punching or shearing is widely used for the manufacturing of car body components. This method is known to bring about a very clear plastic deformation and therefore causes a significant increase of mechanical stress and micro-hardness in the zone adjacent to the cut edge. To improve the cut edge quality, surface treatments, such as sandblasting, are often used. This surface treatment generates a compressive residual stress layer in the subsurface region. The monotonic tensile properties and deformation mechanisms of these steels have been extensively studied, as well as the effect of grain size and distribution and chemical composition on fatigue behaviour; however, there is not so much documentation about the fatigue performance of these steels cut using different strategies. Thus, the aim of this work is to analyse the fatigue behaviour of a TWIP steel after mechanical cutting with and without sandblasting in Low and High-Cycle Fatigue regimes. The fatigue behaviour has been determined at room temperature with tensile samples tested with a load ratio of 0.1 and load amplitude control to analyse High-Cycle Fatigue behaviour; and a load ratio of -1 and strain amplitude control to determine the Low-Cycle Fatigue behaviour. Samples were cut by shearing with a clearance value of 5%. Afterwards, a part of the cut specimens were manually blasted using glass microspheres of 40 to 95 microns of diameter as abrasive media. The results show a beneficial effect of the sandblasting process in fatigue behaviour in both regimes, load amplitude control (HCF) and strain amplitude control (LCF) tests, when these magnitudes are low, while no significant differences are observed with higher amplitudes. low-cycle fatigue, high-cycle fatigue, mechanical cutting, sandblasting, high manganese steel, TWIP steel
24

Miki, Hiroyuki, Noboru Nakayama, and Hiroyuku Takeishi. "Dynamic Molding of Powder Particles at Room Temperature." Materials Science Forum 706-709 (January 2012): 1955–60. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1955.

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A new method of solidifying metal powder by dynamic molding under compression stress was developed. In the solidified specimen, recrystallization is suppressed, so that nanoscale crystal grains remain. The hardness of the specimen prepared by this process is increased relative to materials prepared by other methods. The material properties and preferred orientation of an aluminum plate with crystal grains 100−200 nm in diameter prepared by the new molding process are reported. The correlation between the crystal structure and properties of crystallization are clarified.
25

Hua, Pei Tao, Wei Hong Zhang, Wen Ru Sun, Lin Jie Huang, and Sheng Chao Li. "Uniaxial Compression Test and FEM Simulation for GH4145 Superalloy at Room Temperature." Materials Science Forum 788 (April 2014): 438–45. http://dx.doi.org/10.4028/www.scientific.net/msf.788.438.

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In this paper, uniaxial compression testsfor GH4145 superalloywere conducted on Gleeble-3800 at room temperature and 60°C with strain rates ranging from 0.5s-1 to 10s-1. No cracks were observed in all the specimens deformed from 10% to 70%, indicating that the GH4145 superalloy possesses great ductility under room temperature. The flow stress of GH4145 superalloywas not sensitive to strain rate deformed around room temperature and it decreased slightly with the temperature increasing. Dynamic recovery during deformation will start to balance the effect of work hardening when the true strain was arisen up to 0.4. Good agreement between the calculated and simulated temperature and strain shows that calculation method is accurate enough for the prediction.
26

Siemiaszko, Dariusz, and Iwona Garwacka. "Unexpected High Ductility of Fe40Al Alloys at Room Temperature." Materials 14, no. 17 (August 28, 2021): 4906. http://dx.doi.org/10.3390/ma14174906.

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Iron aluminium alloys, especially those sintered from elemental powders, suffer from low ductility. In this paper, an iron aluminium alloy (Fe40Al) produced by pressure-assisted induction sintering from elemental powders is shown and described. Samples produced by this method show an unexpectedly high ductility in the compression test that is an order of magnitude higher than the literature values. Microstructural observations show plastic behaviour with significant deformation of the grains and a lack of decohesion. At the same time, the tensile properties of these samples remain at much lower levels. An attempt to explain this phenomenon is made and described in this paper.
27

Lai-Fook, Stephen J., and Yih-Loong Lai. "Airway resistance due to alveolar gas compression measured by barometric plethysmography in mice." Journal of Applied Physiology 98, no. 6 (June 2005): 2204–18. http://dx.doi.org/10.1152/japplphysiol.00869.2004.

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We developed a method for measuring airway resistance (Raw) in mice that does not require a measurement of airway flow. An analysis of Raw induced by alveolar gas compression showed the following relationship for an animal breathing spontaneously in a closed box: Raw = AbtVb/[Vt (Ve + 0.5Vt)]. Here Abt is the area under the box pressure-time curve during inspiration or expiration, Vb is box volume, Vt is tidal volume, and Ve is functional residual capacity (FRC). In anesthetized and conscious unrestrained mice, from experiments with both room temperature box air and body temperature humidified box air, the contributions of gas compression to the box pressure amplitude were 15 and 31% of those due to the temperature-humidity difference between box and alveolar gas. We corrected the measured Abt and Vt for temperature-humidity and gas compression effects, respectively, using a sinusoidal analysis. In anesthetized mice, Raw averaged 4.3 cmH2O·ml−1·s, fourfold greater than pulmonary resistance measured by conventional methods. In conscious mice with an assumed FRC equal to that measured in the anesthetized mice, the corrected Raw at room temperature averaged 1.9 cmH2O·ml−1·s. In both conscious mice and anesthetized mice, exposure to aerosolized methacholine with room temperature box air significantly increased Raw by around eightfold. Here we assumed that in the conscious mice both Vt and FRC remained constant. In both conscious and anesthetized mice, body temperature humidified box air reduced the methacholine-induced increase in Raw observed at room temperature. The method using the increase in Abt with bronchoconstriction provides a conservative estimate for the increase in Raw in conscious mice.
28

Oliveira, Louise Fernanda Rodrigues, Mauricio David Martins das Neves, and Fernando dos Santos Ortega. "AISI 310 Stainless Steel Formed by Gelcasting: An Alternative Manufacturing Method." Materials Science Forum 1012 (October 2020): 325–30. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.325.

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This work evaluates the microstructure and the yield strength under compression at room temperature and at 800°C of specimens prepared with AISI 310 stainless steel powder (D50 = 10 μm), manufactured by gelcasting. Parts were vacuum sintered in a single batch at 1280°C. At room temperature, specimens presented average yield strength of 270 MPa, and at 800°C, 105 MPa. Microstructure analysis involved the measurement of grain size along the vertical axis of cylindrical specimens, with special attention to the effect of particles settling, and was conducted using scanning electron and optical microscopy, and X-ray diffraction. Settling effect was assessed considering the position where the specimen was taken and was negligible: both density and yield strength did not vary significantly along the vertical axis.
29

ZHOU, JIANQIU, RONGTAO ZHU, and ZHENZHONG ZHANG. "DEFORMATION MECHANISM OF BULK NANOCRYSTALLINE NI PREPARED BY PLASMA EVAPORATION METHOD." International Journal of Modern Physics B 23, no. 06n07 (March 20, 2009): 1640–45. http://dx.doi.org/10.1142/s0217979209061391.

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Bulk nanocrystalline Ni samples were prepared by plasma evaporation method combined with hot pressure sintering. The compressive mechanical properties of the bulk samples were tested under quasi-static strain rates at room temperature and the evolution of microstructure of bulk sample before and after compression was studied. The experimental results indicated that the bulk samples show a good combination of strength and ductility and have obvious strain rate sensitivity. Both dislocation glide mediated and grain boundary mediated deformation mechanism were found to be main operating deformation mechanisms for the bulk samples based on the mechanical behaviors and grain refinement after compression.
30

Fatemi, S. M., A. Zarei-Hanzaki, and H. Paul. "Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion." Archives of Metallurgy and Materials 61, no. 3 (September 1, 2016): 1593–600. http://dx.doi.org/10.1515/amm-2016-0260.

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Abstract An AZ31magneium alloy was processed through accumulative back extrusion (ABE) process at 280 °C up to six passes. Compressive deformation behavior of the processed materials was studied by employing uniaxial compression tests at room temperature. The results indicated that grains of 80 nm to 1 µm size were formed during accumulative back extrusion, where the mean grain size of the experimental material was reduced by applying successive ABE passes. A deformation texture characterizing with the basal plane mainly lie inclined to the deformation axis was developed. Compressive yield and maximum compressive strengths were measured to increase by applying successive extrusion passes, while the strain-to-fracture dropped. The evolution of mechanical properties was explained relying on the grain refinement effect as well as texture change. It was described that the share of different deformation mechanisms and developing of shearing regions near the grain boundaries may influence the deformation behavior of the ultrafine/nano grained AZ31 alloy.
31

LEONTYEV, V. V., E. V. KONDRATOVA, and V. P. KOLOMIYCHENKO. "STRESS-STRAIN STATE OF AN UNLOADED RIVET JOINT OBTAINED BY THE HOT METHOD." Fundamental and Applied Problems of Engineering and Technology, no. 1 (2021): 28–33. http://dx.doi.org/10.33979/2073-7408-2021-345-1-28-33.

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A method for creating a rivet connection using hot riveting is considered. A rivet heated to a temperature of 900 С is placed in a cylindrical hole in the plates at room temperature. When cooled to room temperature, the rivet is subjected to thermal compression and creates a tight fit. The elastic-plastic contact heat-strength problem for such a compound in the COMSOL MULTIPHYSICS software package was solved using the finite element method. The problem is solved in a three-dimensional statement. The first stage is the temperature distribution in the rivet-sheet system. The resulting temperature field is used as a parameter at the second stage when solving the strength problem. The fields of residual stresses in the connection parts are obtained. It is shown that the equivalent stresses are close to the ultimate strength of the material of these parts. The analysis of axial stresses confirms the possibility of creating a tight connection by hot riveting. Recommendations for calculating the strength of such compounds are given.
32

Sopha, Suthiphong, Santirat Nansa-Arang, and Prachya Peasura. "Synthesis of Closed Cell Aluminum Foam Using the Compression Method." Advanced Materials Research 711 (June 2013): 195–98. http://dx.doi.org/10.4028/www.scientific.net/amr.711.195.

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This research was to study the synthesis of aluminum foam with pure aluminum and its mechanical properties. The synthesis varied at 1% - 5% of TiH2 and mixed with 99.7 % aluminum powder size of 44 µm. then compressed by hydraulic at 25, 30 and 35 tons in the diameter 27 mm, high 60 mm molded. The Aluminum foams were produced by using heat treatment at 800 °C for 10 minutes then cool to room temperature and tested its mechanical properties. The results showed that aluminum foams which lowest bulk density (0.958 g/cm3) was 2% TiH2 synthesized, compressed at 35 tons and highest bulk density (1.393 g/cm3) was 1% TiH2 synthesized, compressed at 25 tons. Moreover, the highest compressive strength (847 kg/cm2) showed at 2% TiH2 synthesized and compressed at 35 tons. Thus, this research contributes to a body of knowledge that informs the application of aluminum foam.
33

Pan, Kun Ming, Lai Qi Zhang, Wei Du, and Jun Pin Lin. "Room Temperature Brittlement of T2 in the Mo-Si-B System." Materials Science Forum 747-748 (February 2013): 132–38. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.132.

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Compression and three-point bending tests were conducted at room temperature (RM) on the Mo5SiB2 (T2) alloy, which was prepared by sparking plasma sintering (SPS). It was found that almost no plastic deformation occured in the T2 alloy before failure but with a tremendous compressive strength of 2907 MPa. The fracture toughness determined from the single edge notch bend specimen is 3.34 MPa·m1/2, similar to the value of 3.5 MPa·m1/2 in ɑ-Al2O3. Once the cleavage crack initiated near the notch under continuous loads, it propagated on a certain plane (001) until the specimen completely fractured. In this work, the electronic structure was also calculated by the first-principles method, indicating that the contribution to RM brittleness is mainly caused by the covalent bonds which arrange alternately in the T2 phase.
34

Peng, De-Xing. "Room temperature tribological performance of biodiesel (soybean oil)." Industrial Lubrication and Tribology 68, no. 6 (September 12, 2016): 617–23. http://dx.doi.org/10.1108/ilt-10-2015-0143.

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Purpose This paper aims to evaluate the effect of biodiesel additive in fuel system of diesel engines to reduce wear characteristics. Biofuels are environmentally friendly and renewable alternatives to mineral-based fuels and cause low pollution; thus, they can be used to comply with future emission regulations to safeguard environmental and human health. Design/methodology/approach Two types of diesel fuel, pure petrodiesel and soybean oil, were compared for their fuel properties and tribological performance. The ball-on-disk wear testing method was used as an analytical tool for this purpose. The lubricating efficiency of the fuels was estimated using a photomicroscope to measure the average diameter of the wear scar produced on the test ball. Findings The wear experiments showed that the wear scar diameters were 1.13 and 0.94 mm for lubrication of the pure petro-diesel and soybean oil, respectively. However, fatty acids containing biodiesel typically have thicker molecular layers than mineral pure petro-diesel, and thus can reduce the wear rate of the sliding metals. This improved the boundary lubrication conditions and the lubricity of the fuel. Biodiesel fuels are effective lubricity enhancers and have greater lubricity enhancing properties than petro-diesel. Originality/value The ability of biodiesel to be highly biodegradable and its superior lubricating property when used in compression ignition engines make it an excellent fuel. Biofuel is an attractive alternative fuel to various energy sectors, particularly the transportation sector. Biofuel has immense potential for use in a sustainable energy mixture in the future.
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Sakai, Taisei, Hiroyuki Yamada, Nagahisa Ogasawara, Muneyuki Kokudai, and Tsutomu Fukui. "Strain rate dependence of SM490B at room temperature and application to Cowper-Symonds constitutive models." EPJ Web of Conferences 250 (2021): 05005. http://dx.doi.org/10.1051/epjconf/202125005005.

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Steel is widely used as a constituent material for various structures such as automobiles and ships. To perform high precision analysis including high strain rate behavior, an understanding for the strain rate dependence of material strength becomes very important. The purpose of this study is to evaluate the strain rate dependence of material strength with rolled steels for welded structure, JIS SM490B (ASTM E). We investigated the deformation characteristics at room temperature by performing compression tests at a wide range of strain rates and applied the obtained experimental results to the material constitutive model using an optimization method of Nelder-Mead method. The quasi-static tests were conducted using a universal testing machine at the strain rate of 10-3, 10-2 and 10-1 s-1. The impact test was conducted using a split Hopkinson pressure bar apparatus at the strain rate of approximately 103 s-1. As the results of the compression tests, it was confirmed that SM490B has a positive strain rate dependence of material strength. The Cowper-Symonds constitutive model showed good agreement with the experimental results up to the strain of 20%. However, the error became larger between experimental results and CS approximation as the strain increases to 20% or more.
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Dong, Xue, Jia Chen Liu, Zhen Guang Hou, Min Wang, and Geng Tian. "Mechanical Evaluation of the Porous Ceramics Prepared by Filtration with a Framework Structure of the Polycrystalline Fibers." Materials Science Forum 745-746 (February 2013): 565–70. http://dx.doi.org/10.4028/www.scientific.net/msf.745-746.565.

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Porous ceramics with a framework structure of the polycrystalline mullite fibers, in which the silica sol were impregnated into the intertwined points, were synthesized by the infiltration method. The sample has a porosity of 90 %, and the compression strength was significantly improved compared with the matrix without any addictives. The elastic behavior was investigated by changing the loading speeds. It is found that the elastic behavior of the porous ceramics was different from the traditional ceramics. The compression set is about 15% and the rebound resilience is 85 % at room temperature. The composite can keep good performance of compression-rebound.
37

Scudino, Sergio, Kumar B. Surreddi, Hoang V. Nguyen, Gang Liu, Thomas Gemming, Mira Sakaliyska, Ji S. Kim, Jens Vierke, Markus Wollgarten, and Jurgen Eckert. "High-strength Al87Ni8La5 bulk alloy produced by spark plasma sintering of gas atomized powders." Journal of Materials Research 24, no. 9 (September 2009): 2909–16. http://dx.doi.org/10.1557/jmr.2009.0359.

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In situ devitrification and consolidation of gas atomized Al87Ni8La5 glassy powders into highly dense bulk specimens was carried out by spark plasma sintering. Room temperature compression tests of the consolidated bulk material reveal remarkable mechanical properties, namely, high compression strength of 930 MPa combined with plastic strain exceeding 25%. These findings demonstrate that the combined devitrification and consolidation of glassy precursors by spark plasma sintering is a suitable method for the production of Al-based materials characterized by high strength and considerable plastic deformation.
38

Samantaray, Sai Smruti, Seth T. Putnam, and Nicholas P. Stadie. "Volumetrics of Hydrogen Storage by Physical Adsorption." Inorganics 9, no. 6 (June 4, 2021): 45. http://dx.doi.org/10.3390/inorganics9060045.

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Physical adsorption remains a promising method for achieving fast, reversible hydrogen storage at both ambient and cryogenic conditions. Research in this area has recently shifted to focus primarily on the volumetric (H2 stored/delivered per volume) gains achieved within an adsorptive storage system over that of pure H2 compression; however, the methodology for estimating a volumetric stored or delivered amount requires several assumptions related to the ultimate packing of the adsorbent material into an actual storage system volume. In this work, we critically review the different assumptions commonly employed, and thereby categorize and compare the volumetric storage and delivery across numerous different porous materials including benchmark metal-organic frameworks, porous carbons, and zeolites. In several cases, there is a significant gain in both storage and delivery by the addition of an adsorbent to the high-pressure H2 storage system over that of pure compression, even at room temperature. Lightweight, low-density materials remain the optimal adsorbents at low temperature, while higher density, open metal-containing frameworks are necessary for high-density room temperature storage and delivery.
39

Yu, Weixin, Shusen Hou, Zhijun Yang, Jinyong Zhang та Shaoting Lang. "Characterization and Modeling of Room-Temperature Compressive Creep Behavior of a Near α TA31 Titanium Alloy". Metals 10, № 9 (4 вересня 2020): 1190. http://dx.doi.org/10.3390/met10091190.

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The creep behavior of a near α TA31 titanium alloy under different compressive pressures has been studied by long-time (up to 500 h) compression tests at room temperature. The experimental results show that several thresholds of the compressive pressure were found to exist in the compression process of the TA31 alloy. When the compressive stress is lower than 0.80Rp0.2, there is no creep. There is a steady-state creep stage at the compressive stresses between 0.85Rp0.2 and 0.93Rp0.2, in which the strain rate is approximately a constant value. When the compressive stress reaches a threshold stress between 0.93Rp0.2 and 0.95Rp0.2, the sample enters the accelerating creep stage directly. The creep model of TA31 alloy has been built by using the regression method, from which the creep strain rate of TA31 titanium alloy in the steady-state creep stage under different compressive stress levels can be calculated. The mean difference between the calculated and the experimental value is 2.54%, indicating the creep model can efficiently predict the creep behavior of TA31 alloy.
40

Kunheng, Li, Chen Zhiyong, and Shi Wenku. "Rubber aging life prediction based on interpolation and improved time-temperature superposition principle." Materials Research Express 9, no. 1 (January 1, 2022): 015301. http://dx.doi.org/10.1088/2053-1591/ac45ba.

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Abstract With focus on quickly and accurately predicting and evaluating the aging performance degradation of rubber at room temperature, the pseudo-failure life at each different acceleration temperature is proposed to be calculated by interpolation method based on indoor high temperature accelerated aging data, and on the basis of the obtained pseudo-failure life. By introducing the time-temperature equivalence principle, a shift factor obeying to an Arrhenius law is derived, and master curves are built as well for the compression set as for the ultimate mechanical properties. The concept of the sum of squares of dispersion coefficient errors is proposed to evaluate the prediction accuracy. Meanwhile a quantitative calculation method that considers the effect of temperature on the performance degradation curve and the shift factor is innovatively proposes. The results show that the proposed optimization method based on the traditional time-temperature superposition principle can quickly process the aging life at room temperature, and the prediction results are distributed within the 3-fold dispersion line, which can well meet the engineering requirements. The reduction of the DSC value from 1.4164 to 1.0828 further demonstrates the effectiveness of the proposed method above. This method can provide some reference for other related polymer materials accelerated aging data processing and life prediction.
41

Yavari, A. R., J. J. Lewandowski, and J. Eckert. "Mechanical Properties of Bulk Metallic Glasses." MRS Bulletin 32, no. 8 (August 2007): 635–38. http://dx.doi.org/10.1557/mrs2007.125.

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AbstractIn the absence of dislocation-mediated crystallographic slip, room-temperature deformation in metallic glasses occurs in thin shear bands initially only ∼10 nm thick. A sharp drop in viscosity (shear softening) occurs in deformed glassy matter and facilitates additional flow in existing shear bands. This further localization of plastic flow leads to shearing-off failure without any significant macroscopic plasticity.However, whereas most bulk metallic glasses fail in this manner, some undergo surprisingly extensive plastic deformation (in some cases, up to 50% or more) in compression or bending. When this occurs, the flow is “jerky,” as indicated by serrated stress–strain curves. Each serration may correspond to the emission of a shear band that then ceases to operate, at least temporarily, despite the predicted shear softening. As elastic energy is converted to heat during shear, temperatures rise sharply at or near shear bands. This heating may lead to the growth of nanocrystals that then block propagation of shear bands and cracks. The understanding of the dependence of mechanical response of metallic glasses on intrinsic (elastic constants, chemistry) and extrinsic factors (shapes, flaws) is the subject of intense current interest.
42

Mašek, Bohuslav, David Aišman, Hana Jirková, and Stefan Wurster. "Micro-Compression Test of Thixoformed Austenite." Solid State Phenomena 192-193 (October 2012): 215–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.192-193.215.

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Thixoforming is an alternative forming method, by which intricate and complex-shaped products can be manufactured using a single production step. This technology allows a material’s microstructure to be altered profoundly. Typical microstructure of steels processed in this manner consists of quasi-polyhedral austenite grains embedded in a ledeburite-carbide network. This type of microstructure was produced by processing the experimental material in this study: the X210Cr12 steel. Since austenite is a metastable component depending on oversaturation with a number of elements, its thermal and mechanical stability needs to be known. This information is required for further modification and enhancment efforts. In previous experiments, the thermal stability was tested by thermal exposure. In the present work, the behaviour of austenite was explored under mechanical load at room temperature in a micro-compression test. A single block of austenitic material was used for making a test specimen with the dimensions of 2.4×2.2×4.9 µm. Its mechanical properties were measured and deformation stability was investigated using compressive deformation.
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Akhtar, Naveed, Muhammad Afzal, Muhammad Awais, and Muhammad Akbar. "Optimizing Cold Compression Deformation to Remove Residual Stresses in Die Forged Disc of Al-Mg-Si Alloy." Key Engineering Materials 778 (September 2018): 53–60. http://dx.doi.org/10.4028/www.scientific.net/kem.778.53.

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Quenching residual stresses in Al-Mg-Si alloy forged disc were balanced via cold deformation compression method. In this experiment firstly, the forged disc of Φ210x52 mm was prepared from extruded stock material of Φ160x90 mm through close die forging technique. Next, the forged discs were quenched in water and cold compressed immediately. Finally, the discs were artificial aged to finish in T652 temper. Close die forging and cold compression deformation was performed on a 1200 Ton hydraulic forging press. The amount of cold compression deformation was varied from 2.0 to 5.0% to gauge the optimum level of cold compression for the removal of quenching residual stresses. The residual stresses were measured in terms of dimensional stability of the machined component. Results showed that the 3.8% cold compression deformation was the optimized value for the work piece geometry under investigation. Further, the effect of cold (room temperature) and hot water (~60°C) quenching on the residual stresses was also studied and compared with that of cold compression method.
44

Rodak, Kinga, and Tomasz Goryczka. "Refinement of the Cu Structure by Oscillatory Compression Test." Solid State Phenomena 130 (December 2007): 111–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.130.111.

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Polycrystalline Cu has been deformed at room temperature by oscillatory compression method to true reduction εh = 0.6 and 1. Microstructure by using transmission electron microscopy (TEM) and texture evolution after deformations was investigated. Oscillatory compressed microareas contains two distinctive regions: fine grains inside banded microstructure with large misorientation and surrounding matrix with submicrometer subgrains with a fraction of both low and high angle boundaries. Moreover nucleation of new grains under recrystallization takes place at the local-regions. The study of the crystal orientation distribution during applied deformation showed that the pole figure registered for the sample after compression shows ring of pole density, which concentrates around projection of <011>. Oscillatory compression causes formation of two axial texture components: <001> and <011>.
45

Błażejewski, Wojciech, Michał Barcikowski, Marek Lubecki, Paweł Stabla, Paweł Bury, Michał Stosiak, and Grzegorz Lesiuk. "The Mechanical Investigation of Filament-Wound CFRP Structures Subjected to Different Cooling Rates in Terms of Compressive Loading and Residual Stresses—An Experimental Approach." Materials 14, no. 4 (February 22, 2021): 1041. http://dx.doi.org/10.3390/ma14041041.

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Although cooling at ambient temperature is widely used and is said to be safe and convenient, faster cooling may have an influence not only on the time of the manufacturing process but also on the mechanical response, especially the residual stress. The study aimed to investigate the influence of the cooling rate after curing on the mechanical response of filament-wound thick-walled carbon fiber reinforced polymer (CFRP) rings. Three cooling rates were taking into consideration: cooling with the oven, at room temperature, and in the water at 20 °C. The splitting method was used to examine the residual strains. In the radial compression test, the mechanical response was investigated between the rings with different cooling regimes. The FEM analysis of the compression test in elastic range was also performed. Both the splitting method and the radial compression test showed no significant difference in the mechanical response of the CFRP rings. The presented results showed that the fast-cooling rate slightly decreases the mechanical performance of the filament-wound rings.
46

Shen, Yung Kang. "A Novel Fabrication Method for Mold Insert of Injection Molded Microlens Array." Materials Science Forum 532-533 (December 2006): 665–68. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.665.

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This paper reports a simple and novel procedure for mold insert of microlens array. The micro injection molding (MIM) and micro injection-compression molding (MICM) are used to replicate the microlens array. The 200×200 arrays of molded microlens, with a diameter of 150 $m, a pitch of 200 $m and a sag height of 11.236 $m have been successfully fabricated. The average surface roughness of the Ni mold insert is 6.916 nm. The average surface roughness of the molded microlens array is 4.608 nm for MIM and 4.555 nm for MICM. The complete fabrication process of mold insert is executed at room temperature and low pressure for this paper.
47

Inomoto, Masahiro, Norihiko L. Okamoto та Haruyuki Inui. "Compression of Single-Crystal Micropillars of the Γ Intermetallic Phase in the Fe-Zn System". Advanced Materials Research 922 (травень 2014): 264–69. http://dx.doi.org/10.4028/www.scientific.net/amr.922.264.

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The deformation behavior of the Γ (gamma) phase in the Fe-Zn system has been investigated via room-temperature compression tests of single-crystal micropillar specimens fabricated by the focused ion beam method. Trace analysis of slip lines indicates that {110} slip occurs for the specimens investigated in the present study. Although the slip direction has not been uniquely determined, the slip direction might be <111> in consideration of the crystal structure of the Γ phase (bcc).
48

Trojanová, Zuzanka, and Zoltán Száraz. "Enhanced Plasticity of a Mg-8Li Alloy Reinforced with SiC Particles." Key Engineering Materials 465 (January 2011): 378–81. http://dx.doi.org/10.4028/www.scientific.net/kem.465.378.

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Mg8Li alloy reinforced by 7 vol.% SiC particles was processed by a powder metallurgical method. Samples were deformed in tension and compression at temperatures from room temperature up to 300 °C. The yield stress as well as the maximum stress decrease with increasing temperature. Decreasing stresses detected at temperatures higher than 150 °C indicate possible presence of recovery process/es. Estimated activation enthalpy is close to the activation enthalpy for the grain boundary sliding. Strain rate sensitivity was estimated at elevated temperatures. Enhanced plasticity was estimated at 300 °C. Light and scanning electron microscopy revealed the cavitations during the high temperature deformation.
49

Zhang, Lei, Rui Wu Zhang, Li Dong Wang, Ying Jie Qiao, Shi Chong Xu, and Wei Dong Fei. "Effect of MgO Coating on Whisker Preform Strength of Aluminum Matrix Composite Fabricated by Squeeze Casting." Advanced Materials Research 750-752 (August 2013): 2126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.2126.

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In this paper, MgO with different contents was coated on the surface of magnesium borate whisker using chemical precipitation method. The resistance to compression of whisker perform was measured, and the effect of MgO coating on the deformation resistance of magnesium borate whisker perform was studied. The result shows that the compression strength of whisker perform sintered at 900°C was enhanced with increasing MgO coating ratio to magnesium borate whisker. The compression strength was increased from 0.80MPa for coating ratio of 0 to 1.34Mpa for coating ratio of 1:10. Then magnesium borate whisker-reinforced pure aluminum (MBOw/Al) composite without apparent microscopic defects was fabricated using modified whisker perform. The tensile strength and elastic modulus at room temperature attain 240MPa and 130GPa, respectively.
50

Aitviriyaphan, Vanussanun, Thanapong Sareein, Sudarath Suntaropas, Panakamon Thonglor, Sangwoei Sawekwiharee, Suejit Pechprasarn, Wirote Ritthong, Supree Pinitsoontorn, and Naphat Albutt. "Study, Magnetic Properties of BaTiFeO3 Perovskite Prepared by Solid State Method." Applied Mechanics and Materials 891 (May 2019): 230–35. http://dx.doi.org/10.4028/www.scientific.net/amm.891.230.

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The magnetic properties of BaFeTiO3 (BTFO) perovskite are investigated. BTFO samples were prepared by solid state reaction method through compression. Magnetic properties are influenced by electron environments of the Fe3+ ions within the perovskite structure. Furthermore, the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered at 800 oC for sintering as 800 oC for 6 hours at 1.898 emu/g, which is magnetization strength material more than sintering at 4 hours, 8 hours, 10 hours as 1.794 emu/g, 1.333 emu/g and 1.192 emu/g at measured of low temperature. Using the Curie-Weiss law fitting for investigate μeff~38μB high spin of Fe, negative of θ present to antiferromagnetic characteristics of BTFO sample. Finally, BTFO sintering at the high temperature of 800 oC for 6 hours exhibited the high Ms~1.898 emu/g at 50 K and ~1.216emu/g at room temperature.

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