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Journal articles on the topic 'Ti–TiB2 powder'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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1

Hou, Jiabin, Lin Gao, Guorong Cui, Wenzhen Chen, Wencong Zhang, and Wenguang Tian. "Grain Refinement of Ti-15Mo-3Al-2.7Nb-0.2Si Alloy with the Rotation of TiB Whiskers by Powder Metallurgy and Canned Hot Extrusion." Metals 10, no. 1 (2020): 126. http://dx.doi.org/10.3390/met10010126.

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In situ synthesized TiB whiskers (TiBw) reinforced Ti-15Mo-3Al-2.7Nb-0.2Si alloys were successfully manufactured by pre-sintering and canned hot extrusion via adding TiB2 powders. During pre-sintering, most TiB2 were reacted with Ti atoms to produce TiB. During extrusion, the continuous dynamic recrystallization (CDRX) of β grains was promoted with the rotation of TiBw, and CDRXed grains were strongly inhibited by TiBw with hindering dislocation motion. Eventually, the grain sizes of composites decreased obviously. Furthermore, the stress transmitted from the matrix to TiBw for strengthening i
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2

Silva, Gilbert, Erika Coaglia Trindade Ramos, and Alfeu Saraiva Ramos. "Effect of Milling Parameters on the TiB and TiB2 Formation in Ti-50at%B and Ti-66at%B Powders." Materials Science Forum 591-593 (August 2008): 135–40. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.135.

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This work discusses on the effect of milling parameters on the TiB and TiB2 formation in Ti-50at%B and Ti-66at%B powders, respectively. Both powder mixtures were processed in a planetary ball Fritsch P-5 ball mill under Ar atmosphere, varying the milling parameters: rotary speed (150 and 200 rpm), size of balls (10 and 19mm diameter) and ball-to-powder weight ratio (2:1 and 10:1). In order to obtain the equilibrium structures the milled powders were heated at 1200oC for 1h. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal analysis (DSC). XR
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3

Zhao, Jin Nan, Jing Liang, Sui Yuan Chen, Chang Sheng Liu, and Feng Hua Liu. "Microstructure and Wear Properties of Laser Synthesized Composite Coatings on Ti-6Al-4V." Applied Mechanics and Materials 217-219 (November 2012): 1354–58. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1354.

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Ti-6Al-4V, C and TiB2 powders (71.5%Ti-6Al-4V+ 26.2%TiB2+2.3%C in wt. %) were prepasted and then laser clad on Ti-6Al-4V substrates. Laser cladding was carried out with a Nd:YAG pulse laser with the parameters of defocus length 15mm, pulse frequency 15Hz, scanning speed 2-4mm/s, electric current 200-240A. Microstructure and phases were analyzed with the Optical Microscopy(OM), Scanning Electron Microscopy(SEM) and X-Ray Diffraction(XRD). Laser cladding layers with smooth surfaces, good metallurgical bonding with no cracks and pores were formed. The average thickness of the coatings is approxim
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4

Luo, Ping, Shi Jie Dong, Zhi Xiong Xie, Wei Yang, and An Zhuo Yangli. "In Situ Synthesis of TiC-TiB2 Composites via High Energy Ball Milling and Pressureless Sintering." Applied Mechanics and Materials 401-403 (September 2013): 635–38. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.635.

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TiC-TiB2 composite ceramics were successfully fabricated via planetary ball milling of 72 mass% Ti and 28 mass % B4C powders, followed by low temperature sintering process at 1200°C. The microstructure of the ball-milled powder mixtures and composite ceramics were characterized by Differential thermal analysis equipment (DTA), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results showed that the ball-milled powder mixtures (Ti and B4C powders) were completely transformed to TiC-TiB2 composite ceramics as the powders were milled for 60 h and sintered at 12
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5

Stasic, J., and D. Bozic. "The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting." Science of Sintering 52, no. 1 (2020): 15–23. http://dx.doi.org/10.2298/sos2001015s.

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A comparison was made between layer-by-layer laser melting (LM) of two types of feedstock powders: (1) elemental powder blend and (2) mechanically alloyed powder. LM was done by Nd:YAG laser at 1064 nm (max. average power 100 W) in argon ambience. Samples synthesized were Cu-Ti-TiB2 rectangular tracks (20?6?1 mm), and input parameters of the process: powder layer thickness 100-250 ?m, hatch spacing 1 mm, pulse length 4 ms, energy 4 J, pulse repetition rate 20 Hz. Part of the samples was heat-treated in argon at 900 ?C, 10 h. Structural characterization of the samples was done using light micro
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6

Liang, Jing, Xiao Meng Tan, Cheng Jin Wang, Sui Yuan Chen, Chang Sheng Liu, and Jin Cheng Qin. "Microstructure on Laser In Situ Deposit of TiBx/TiC ReinforcedComposite Coatings." Materials Science Forum 849 (March 2016): 665–70. http://dx.doi.org/10.4028/www.scientific.net/msf.849.665.

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In situ synthesized TiBx/TiC reinforced composite coatings were prepared on Ti-6Al-4V substrate by laser in situ deposition using 10B4C-18TiNi-72Ti-6Al-4V (wt. %) powder blends as the feedstock materials. The microstructural analysis of the composites was performed using scanning electron microscope, and phase analysis was done with X-ray diffraction. The results showed that the composite coatings contained long needle TiB, irregular block TiB2 and disperse particles/dendrites TiC, the thick rod phase which was a inlay structure consisted of TiB2 and TiC. These composite reinforced phases were
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7

Kato, Shinji, Makoto Kobashi, and Naoyuki Kanetake. "Effects of Cu Powder Size on the Microstructure of TiB2/Cu Composites Fabricated by Reactive Infiltration Process." Materials Science Forum 654-656 (June 2010): 2724–27. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2724.

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Recently, industrial technology for both improving thermal conductivity and controlling the coefficient of thermal expansion of heat sink materials has became an important issuebecause of the downsizing of electronic devices. We have been investigating the innovative processing method for TiB2 dispersed Cu matrix composite by reactive infiltration process in which the combustion reaction of elemental powders (Ti+2B+Cu → TiB2+Cu) and pressureless infiltration of molten Cu into porous reaction product (TiB2/Cu composite) are combined. By this process, fine TiB2particles (2~3µm) can be dispersed
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8

SAKAMOTO, Tadashi, Tadahiko WATANABE, and Kazuhisa SHOBU. "Vacuum Sintering of Ti(CN)-TiB2 Powder." Journal of the Ceramic Association, Japan 93, no. 1082 (1985): 666–67. http://dx.doi.org/10.2109/jcersj1950.93.1082_666.

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9

Matsuura, Kiyotaka, and Yuki Obara. "Combustion Synthesis of TiB2 Particle Dispersed Metal Matrix Composites." Materials Science Forum 539-543 (March 2007): 809–13. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.809.

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FeAl-TiB2 composites have been combustion synthesized from mixtures of Fe, Al, Ti and B powders. When the powder mixture was heated in vacuum to approximately 900 K, an abrupt increase in temperature was observed, indicating that the combustion synthesis reactions occurred in the powder mixture. X-ray diffraction analyses revealed that the combustion-synthesized sample consisted of only FeAl and TiB2. Metallographic investigations using a scanning electron microscope revealed that fine TiB2 particles were dispersed in FeAl matrix phase. As the volume fraction of the TiB2 particles increased fr
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10

Kwon, Dae Hwan, Thuy Dang Nguyen, Dina V. Dudina, et al. "Thermal Stability and Properties of Cu-TiB2 Nanocomposites Prepared by Combustion Synthesis and Spark-Plasma Sintering." Materials Science Forum 534-536 (January 2007): 1517–20. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1517.

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In the present work, Cu-TiB2 nanocomposite powders were synthesized by combining high-energy ball-milling of Cu-Ti-B mixtures and subsequent self-propagating high temperature synthesis (SHS). Cu-40wt.%TiB2 powders were produced by SHS reaction and ball-milled. The milled SHS powder was mixed with Cu powders by ball milling to produce Cu-2.5wt.%TiB2 composites. TiB2 particles less than 250nm were formed in the copper matrix after SHS-reaction. The releative density, electrical conductivity and hardness of specimens sintered at 650-750°C were nearly 98%, 83%IACS and 71HRB, respectively. After he
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11

Huynh, X. K., B. W. Kim, and J. S. Kim. "Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB." Archives of Metallurgy and Materials 62, no. 2 (2017): 1393–98. http://dx.doi.org/10.1515/amm-2017-0215.

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AbstractThe in situ formation of TiB2particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH2and the interface reactions between Ti and FeB powders to form TiB2were investigated. Powder mixtures were fabricated using planetary ball-milling under various milling conditions. The specific ball-milling energy was calculated from the measured electrical power consumption during milling process. High specific milling energy (152.6 kJ/g) resulted in a size reduction and homogeneous dispersio
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12

Miyamoto, Yoshinari, Takashi Nakamoto, Mitsue Koizumi, and Osamu Yamada. "Ceramic-to-metal welding by a pressurized combustion reaction." Journal of Materials Research 1, no. 1 (1986): 7–9. http://dx.doi.org/10.1557/jmr.1986.0007.

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A new method of ceramic-to-metal welding has been developed using a pressurized combustion reaction to form Mo—TiB2—Mo and Mo—TiC—Mo couples. Mixtures of Ti powder with B or C between Mo disks were electrically ignited under 3 GPa pressure. The exothermic reaction of the powders resulted in the formation of TiB2 and TiC and reaction with Mo at the metal interface. Weld strengths of the Mo—TiB2—Mo and Mo—TiC—Mo couples were 20—40 MPa and ∼ 10 MPa, respectively.
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13

Kaplan, Yavuz, Mehmet Gülsün, and Sinan Aksöz. "Formation of boride layers on a commercially pure Ti surface produced via powder metallurgy." International Journal of Materials Research 112, no. 4 (2021): 303–7. http://dx.doi.org/10.1515/ijmr-2020-8163.

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Abstract In this study, powder metallurgy was applied in a furnace atmosphere to form titanium boride layers on a commercially pure Ti surface. Experiments were carried out using the solid-state boriding method at 900 °C and 1000°C for 12 h and 24 h. Samples were produced by pressing the commercially pure Ti powders under 870 MPa. The sintering process required by the powder metallurgy method was carried out simultaneously with the boriding process. Thus, the sintering and boriding were performed in one stage. The formation of the boride layer was investigated by field emission scanning electr
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14

Zherebtsov, S., M. Ozerov, M. Klimova, D. Klimenko, V. Sokolovsky, and N. Stepanov. "Evolution of microstructure and mechanical properties of Ti-based metal-matrix composites during hot deformation." MATEC Web of Conferences 321 (2020): 12016. http://dx.doi.org/10.1051/matecconf/202032112016.

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Two Ti-based composites, viz. Ti/TiB and Ti-15Mo/TiB were produced by spark plasma sintering using a Ti-10wt.%TiB2 powder mixture at 1000°C or Ti-14.25(wt.)%Mo-5(wt.)%TiB2 powder mixture at 1400°C, respectively. Specimens of the metal-matrix composites (MMCs) were subjected to uniaxial compression in the temperature range from 500 to 1050°С to determine processing window. Processing maps for both MMCs were constructed and analyzed. Mechanical behavior and microstructure evolution of both MMCs during multiaxial forging (MAF) at 700°C and at a strain rate 10-3 s-1 were studied. The flow stress f
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15

Yang, Fang, Zhi Meng Guo, Jun Jie Hao, and Yong Liang Shi. "Self-Propagating High-Temperature Synthesis of TiB2-Ti(C, N) Cermets Composite Powder." Advanced Materials Research 468-471 (February 2012): 1247–50. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1247.

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The ultra-fine TiB2-Ti(C, N) composite powders were prepared by self-propagating high-temperature synthesis (SHS) with Ti, BN and C powders as its starting materials. The morphology of the products was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed the composite powders were consisted of the mainly phases Ti(C, N), TiB2 and a small amount of TiN phase. With the Ni addition, the brittle phase Ni3B was appeared. SEM results revealed that the composite powders had a uniform particle size, a round grain-shaped structure and a narrow size distrib
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16

Yoshida, Wataru, Makoto Kobashi, and Naoyuki Kanetake. "Effect of Powder Blending Ratio on Synthesis of TiB2 Particles by Al-Ti-B Combustion Reaction." Advanced Materials Research 26-28 (October 2007): 325–28. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.325.

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It is favorable to disperse fine strengthening particles under 1μm to expect the effective dispersion strengthening mechanism of metal matrix composites. In this research, TiB2 particle was synthesized in Al matrix by a combustion reaction and the influence of the powder blending ratio was examined in detail. The mole mixture ratio of Ti and B powder was fixed to B/Ti=2, and the blending ratio of Al powder was varied from 40 to 70vol%. The compacted blended powder was heated under an Ar atmosphere in an induction furnace, and heating was stopped immediately after the combustion reaction took p
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17

Liu, Hong Wei. "Influence of Powder Preparation Technology on In Situ Reactive Synthesized Ti (C,N)-TiB2 Composite Ceramics." Advanced Materials Research 744 (August 2013): 334–38. http://dx.doi.org/10.4028/www.scientific.net/amr.744.334.

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Mechanical adhesion method and precursor method were used to prepare Ti-B4C-C and Ti-B4C-Sucrose composite powders respectively with Ti, B4C, graphite and sucrose (precursor of C) as raw materials. Ti (C,N)-TiB2 composite ceramic preforms were prepared with the two kinds of powders by self-reactive spray forming technology. The compositions and microstructure were analyzed and observed by means of XRD and SEM. The porosity and fracture toughness of the preforms were tested. Then the influence of powder preparation technology on the microstructure and properties of the preforms were contrastive
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18

Kwon, Dae Hwan, Khoa Xuan Huynh, Thuy Dang Nguyen, et al. "Mechanical Behavior of TiB2 Nanoparticles Reinforced Cu Matrix Composites Synthesized by In-Situ Processing." Materials Science Forum 510-511 (March 2006): 346–49. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.346.

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Cu-TiB2 nanocomposite powders were in situ synthesized by combining high-energy ball milling of Cu-Ti-B elemental powder mixtures as precursors and subsequent self-propagating high temperature synthesis (SHS). Cu-40wt.% TiB2 was produced after SHS reaction and then diluted by copper to obtain desired homogeneous composites with 2.5, 5 and 10wt.%TiB2. Spark plasma sintering (SPS) was used to inhibit grain growth and thereby obtain fully Cu-TiB2 sintered bodies with nanocomposite structure. After SHS reaction, only Cu and TiB2 phases were detected in the SHS-product. Spheroidal TiB2 particles sm
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19

Huang, Xue Gang, Jie Huang, Zhong Min Zhao, and Jun Yan Wu. "Crystal Growth and Fracture Behavior of Solidified TiC-TiB2 Prepared by Combustion Synthesis in High-Gravity Field." Key Engineering Materials 680 (February 2016): 141–46. http://dx.doi.org/10.4028/www.scientific.net/kem.680.141.

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Based on the technology of combustion synthesis in high-gravity field, the TiC-TiB2 ceramics with refined microstructures have been fabricated by adjusting the technological parameter and proportioning of raw starting powders. The effects of particle size of raw powders on crystal growth and mechanical properties were studied in this paper. It found that the propagation rate and the combustion temperature can be improved by decreasing the grain size of raw powders, as well as the heat exchange and mass diffusion were enhanced too, so that the microstructure homogenization, densification and me
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20

Zhang, Duo, Yu Ling Yang, and Yi Ju. "Thermodynamics and Phase Constituents of Laser Induced In-Situ-Fabrication of TiB2 Ceramic Coating on Ti-6Al-4V." Applied Mechanics and Materials 275-277 (January 2013): 2304–7. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.2304.

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In-situ fabrication of TiB ceramic coating by laser cladding technology (LC) was investigated. Pulsed YAG laser with the power of 500 W was used. The mixture of Titanium powder (with the size of 20 m) and B powder (with the size of 140 m) were utilized as the precursor. The reactive transformation mechanism and phase constituents of the in-situ fabricating coating during the laser cladding process were studied by thermodynamics analysis, as well as XRD methods. Gibbs free energy theory was used to calculate the increment of Gibbs free energy at different temperature. The results show that th
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21

Ropars, Ludovic, Moukrane Dehmas, Elisabeth Aeby-Gautier, David Tricker, Dominique Schuster, and Sophie Gourdet. "Effect of Processing Route on Microstructure and Mechanical Properties of a Ti-3Al-2.5V/TiB Composite." Materials Science Forum 941 (December 2018): 1950–55. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1950.

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A Ti-3Al-2.5V matrix composite reinforced with 8.5 vol.% TiB was produced using a powder metallurgy route. Processing included the mechanical alloying of Ti-3Al-2.5V and TiB2 powders and Hot Isostatic Pressing (HIP) of the resultant composite powders, to produce a dense billet. These billets were subsequently extruded and/or subjected to various Conversion Heat Treatments (CHT), to complete the transformation of the TiB2 particles into TiB needles. The CHT was performed either before or after extrusion. Microstructures and tensile properties of the materials at each stage of the processing rou
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22

Sundaram, V., K. V. Logan, and R. F. Speyer. "Reaction path in the magnesium thermite reaction to synthesize titanium diboride." Journal of Materials Research 12, no. 10 (1997): 2657–64. http://dx.doi.org/10.1557/jmr.1997.0355.

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TiB2, along with MgO and Mg3B2O6, was formed by a thermite reaction between Mg, amorphous B2O3, and TiO2 powders in argon. The mixture 5Mg–TiO2–B2O3 along with binary mixtures and single components were analyzed using differential thermal analysis (DTA) and x-ray diffraction (XRD). Large (25 g) specimens were also ignited in bulk using a resistance-heated nichrome wire. The reaction path in forming TiB2 in the three component mixture was deduced. Mg reduces TiO2 and B2O3 to form Ti and MgB2, respectively, which in turn react to form TiB2. In an oxidizing atmosphere, the significant speed of th
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23

Liu, Le, Sofiya Aydinyan, Tatevik Minasyan, and Irina Hussainova. "SHS Produced TiB2-Si Powders for Selective Laser Melting of Ceramic-Based Composite." Applied Sciences 10, no. 9 (2020): 3283. http://dx.doi.org/10.3390/app10093283.

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One of the main limitations for widespread additive manufacturing is availability and processability of the precursor materials feedstock. For the first time, this study reports the development of a “pomegranate-like” structured TiB2-Si ceramic-metalloid powder feedstock suitable for selective laser melting (SLM) of ceramic-based composite. The powder was produced via self-propagating high temperature synthesis (SHS) at a moderate combustion temperature of 1530 °C. The effective activation energy in the Ti-B-Si system for the slow step of the combustion process was estimated as 184 kJ. Conditi
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24

Zavareh, Mitra Akhtari, Mohd Hamdi Bin Abdul Shukor, Reza Rahbari Ghahnavyeh, Malihah Amiri Roudan, and Mohsen Shafieirad. "Fabrication of TiB2-TiC Composites Optimized by Different Amount of Carbon in the Initial Ti-B-C Powder Mixture." Applied Mechanics and Materials 315 (April 2013): 720–23. http://dx.doi.org/10.4028/www.scientific.net/amm.315.720.

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Composites of TiC and TiB2 (TiC-TiB2) were prepared by self-propagating high-temperature synthesis (SHS), using compacted reactant different combinations of Ti, C, and B powders. It is very difficult to densify these materials using conventional sintering techniques. It was found that the chemical reaction between the starting Titanium, boron and carbon particles could be completed at 1200°C producing a pure TiB2+TiC ceramic composite. Various carbon content causes the microstructure of the final products was different.
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25

MOALLEM, MAHBOOBEH, MOHAMMAD HASAN ABBASI, and FATHOLLAH KARIM ZADEH. "SYNTHESIS AND CHARACTERIZATION OF TiB2 NANOCRYSTALLINE POWDER BY MECHANICAL ALLOYING." International Journal of Modern Physics: Conference Series 05 (January 2012): 204–11. http://dx.doi.org/10.1142/s2010194512002036.

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In this investigation, TiB 2 nanocrystalline powder was synthesized by mechanical alloying of the elemental mixture of Ti and B powders in argon atmosphere. In order to study the structural evolution of the powder during ball milling, X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used. Adiabatic temperature calculations were performed for characterization of TiB 2 powder. Also, the effects of heat treatment on the structural evolution and thermal stability of mechanically alloyed powders were investigated. It was found from the XRD patterns that TiB 2 was formed via combu
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26

Lomovsky, O. I., Vjacheslav I. Mali, Dina V. Dudina, et al. "Shock-Wave Synthesis of Titanium Diboride in Copper Matrix and Compaction of TiB2-Cu Nanocomposites." Materials Science Forum 534-536 (January 2007): 921–24. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.921.

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TiB2-Cu composites in a nanostructured state are candidates for high-strength conductive and erosion-resistant materials. In this work, we studied formation of nanostructured TiB2-Cu composites under shock wave conditions. We investigated the influence of preliminary mechanical activation (MA) of Ti-B-Cu powder mixtures on the peculiarities of the reaction between Ti and B under shock wave. In the MA-ed mixture the reaction proceeded completely while in the nonactivated mixture the reagents remained along with the product – titanium diboride. The size of titanium diboride particles in the cent
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27

Ahn, Chi-Won, Oh-Choon Kwon, Kurn Cho, Hong Yong Sohn, and Hyung-Bock Lee. "Phase characterization and burning rate in the self-propagating high-temperature synthesis of titanium borides." Journal of Materials Research 10, no. 12 (1995): 3179–84. http://dx.doi.org/10.1557/jmr.1995.3179.

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Combustion synthesis of titanium borides from Ti and B binary powder mixtures having molar ratios B/Ti of 1.9 to 2.4 resulted in the formation of TiB2 as the primary phase and TiB as the secondary phase. The amount of TiB decreased when the particle size of the Ti in the powder mixtures became small and when the B content was increased. The results are discussed in terms of the homogeneity of reactant powder mixtures and the degree of boron saturation of the Ti-B melt. The burning rate increased from 11 to 15 mm/s as the titanium particle size decreased from −100 to −325 mesh with the same bor
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28

Wang, Gui Song, and Lin Geng. "Microstructure Formation Mechanism of (Al2O3+TiB2+Al3Ti)/Al Composites Fabricated by Reactive Hot Pressing." Key Engineering Materials 353-358 (September 2007): 1439–42. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1439.

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The two (Al2O3+TiB2+Al3Ti)/Al composites were fabricated from Al-B2O3-TiO2 and Al-B-TiO2 raw powders by reactive hot pressing, respectively. The microstructure of in situ two composites was analyzed by OM, SEM and TEM. The results showed that coarse Al3Ti blocks with several tens of micrometers size were formed during hot pressing. The equiaxed Al2O3 particulates and hexagonal TiB2 particulates with finer sizes were formed in the composites simultaneously. The microstructure formation mechanism of (Al2O3+TiB2+Al3Ti)/Al composites were discussed. The results showed that Al2O3 reinforcements wer
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29

Ota, Akinori, Masahiro Yamazaki, and Hiroshi Izui. "Effects of Raw Powder Morphology and Size on Tensile Properties of SPS-Consolidated TiB/Ti Composites." Key Engineering Materials 520 (August 2012): 276–80. http://dx.doi.org/10.4028/www.scientific.net/kem.520.276.

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Titanium matrix composites (TMC) exhibit excellent specific strength and corrosion resistance. TiB whiskers can be formed in titanium by solid-state reaction between titanium and TiB2 powders. The formation of TiB whiskers results in the improvement of tensile strength, Young's modulus and Vickers hardness. In this study, TiB reinforced pulverized or gas atomized pure titaniums were fabricated by spark plasma sintering. We focus on the effects of the powder morphology and size on the tensile properties of TiB/Ti composites. We will investigate the sintering performance and microstructures of T
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30

Wang, Shun Cheng, Ji Lin Li, Chun Lei Gan, and Kai Hong Zheng. "Grain Refinement Mechanism and Effective Nucleation Phase of Al-5Ti-1B Master Alloy." Materials Science Forum 898 (June 2017): 1231–35. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1231.

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The Al-5Ti-1B, Al-10Ti, Al-4B master alloys and TiB2 powder were applied to refine the pure aluminum, respectively. The effects of the TiAl3 phase, TiB2 particle, and AlB2 phase on the grain size of pure aluminum were compared. The grain refinement mechanism of the Al-5Ti-1B grain refiner was studied. The results showed that the TiAl3 phase was an effective heterogeneous nucleus of the α-Al grain. But the TiAl3 phase in the Al-5Ti-1B grain refiner was not the heterogeneous nucleus of the α-Al grain due to its re-melting in the Al melt. The separate TiB2 particle or AlB2 phase was not the heter
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31

Wang, Y. H., J. P. Lin, Y. H. He, Y. L. Wang, and G. L. Chen. "Microstructural characteristics of Ti–45Al–8.5Nb/TiB2 composites by powder metallurgy." Journal of Alloys and Compounds 468, no. 1-2 (2009): 505–11. http://dx.doi.org/10.1016/j.jallcom.2008.01.057.

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32

Promakhov, Vladimir, Alexey Matveev, Nikita Schulz, et al. "High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2." Applied Sciences 11, no. 5 (2021): 2426. http://dx.doi.org/10.3390/app11052426.

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Currently, metal–matrix composite materials are some of the most promising types of materials, and they combine the advantages of a metal matrix and reinforcing particles/fibres. Within the framework of this article, the high-temperature synthesis of metal–matrix composite materials based on the (Ni-Ti)-TiB2 system was studied. The selected approaches make it possible to obtain composite materials of various compositions without contamination and with a high degree of energy efficiency during production processes. Combustion processes in the samples of a 63.5 wt.% NiB + 36.5 wt.% Ti mixture an
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33

Jin, Hua, Yu Tao Zhao, Shuai Chen, and Gui Rong Li. "Preparation and Microstructure of TiB2/Al Composites." Advanced Materials Research 393-395 (November 2011): 249–53. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.249.

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TiB2/Al composites were prepared by the direct melt reaction using Al-3B master alloy and Ti powder as the reactive materials. The phase composition and the microstructure of the as-prepared composites were investigated by XRD, SEM, TEM etc.. It is showed that the reinforcement was only TiB2, moreover, the volume fraction of the reinforcements increased with the increasing of the reactants. The TEM images showed that TiB2particle was in the shape of hexagonal, circle and rectangle, and its size was 0.5-2μm.
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34

YAZDI, ROUHOLLAH, and SEYED FAESHID KASHANI-BOZORG. "FORMATION OF TiN/TiB2/TiAl NANO-COMPOSITE BY MECHANICAL ALLOYING OF A POWDER MIXTURE OF Ti-Al-BN." International Journal of Modern Physics: Conference Series 05 (January 2012): 581–88. http://dx.doi.org/10.1142/s2010194512002504.

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In this investigation, TiN / TiB 2/ TiAl nano-composite powder was produced by mechanical alloying technique and subsequent heat treatment. A powder mixture of Ti , BN , and Al with a molar ratio of 4:2:1 was milled for up to 70 h. Microstructures were studied and characterized using X-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy. The results indicated that TiN and TiB 2-based phases were formed in an amorphous Ti ( Al ) matrix after 30 h of ball milling. With progression of the milling, the amorphous Ti ( Al ) solid solution is partially crystallized and th
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35

Zhukov, Ilya, Vladimir Promakhov, Yana Dubkova, Alexey Matveev, Mansur Ziatdinov, and Alexander Zhukov. "Al-Ti-B4C materials obtained by high-temperature synthesis and used as a master-alloy for aluminum." MATEC Web of Conferences 243 (2018): 00010. http://dx.doi.org/10.1051/matecconf/201824300010.

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The paper presents microstructure, composition, and burning rate of Al alloy produced by high-temperature synthesis (SHS) from powder mixture Al-Ti-B4C with different concentration of Al powder. It has been established that the phase composition of materials obtained at gas-free combustion includes TiB2, Al, and TiC. It is shown that Al content growth powder in initial Al-Ti- B4C mixture from 7.5 to 40 wt.% reduces the burning rate of the powder from 9*10-3 to 1.8*10-3 m/s. For the system consisting of 60 wt.% of (Ti + B4C) and 40 wt.% of Al there is the increase in the porosity of the compact
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36

Wang, Hui Hua, Shu Chen Sun, De Yong Wang, and Gan Feng Tu. "Effect of Ball Milling on Reaction Mechanism between Ti and B4C and Subsequent Densification." Advanced Materials Research 479-481 (February 2012): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.8.

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The effect of ball milling pretreatment of the starting Ti and B4C powder blends on the synthesis of dense TiB2/TiC composite was investigated. X-ray diffraction analysis showed that the TiC phase was not produced until the milling time was up to 18h and only a minimal amount of TiB2was generated, even after 48h of milling. It is clear that no complete conversion of the starting reactants to the desired products characterized as TiB2/TiC powder mixture take place within the investigated conditions. The decreased particle sizes of the reactants and high concentration of defects induced from bal
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37

Saikov, Ivan V., Andrey Yu Malakhov, Vitaliy G. Salamatov, Stepan A. Seropyan, Ilya E. Semenchuk, and D. Yu Kovalev. "Synthesis in SHS-Mixtures by Explosive Loading." Key Engineering Materials 839 (April 2020): 114–18. http://dx.doi.org/10.4028/www.scientific.net/kem.839.114.

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The article is devoted to the study of the characteristics of shock-wave processing of powder mixtures capable of an exothermic reaction of the synthesis of metal-ceramic materials. Experiments on shock-wave initiation of synthesis in systems based on Ti-B and Ti-C with 10% and 20% Ni content were carried out. Explosive loading was carried out by oblique throwing of a steel drummer with speeds of 1000 m / s and 1500 m / s. X-ray phase analysis of synthesis products showed the presence of TiB2 diboride and TiC carbide in the nickel bond. The significant role of the mechanical activation of powd
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38

XU, JIANG, YIDE KAN, and WENJIN LIU. "IN-SITU SYNTHETIC TiB2 PARTICULATE REINFORCED METAL MATRIX COMPOSITE COATING ON AA2024 ALUMINUM ALLOY BY LASER CLADDING TECHNOLOGY." Surface Review and Letters 12, no. 04 (2005): 561–67. http://dx.doi.org/10.1142/s0218625x05007438.

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In order to improve the wear resistance of aluminum alloy, in-situ synthesized TiB 2 and Ti 3 B 4 peritectic composite particulate reinforced metal matrix composite, formed on a 2024 aluminum alloy by laser cladding with a powder mixture of Fe -coated Boron, Ti and Al , was successfully achieved using 3-KW CW CO 2 laser. The chemical composition, microstructure and phase structure of the composite clad coating were analyzed by energy dispersive X-ray spectroscopy (EDX), SEM, AFM and XRD. The typical microstructure of the composite coating is composed of TiB 2, Ti 3 B 4, Al 3 Ti , Al 3 Fe and α
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39

Cui, Gongjun, Yanping Liu, Guijun Gao, Huiqiang Liu, Sai Li, and Ziming Kou. "Preparation, Mechanical Properties, and High-Temperature Wear Resistance of Ti–Al–B alloy." Materials 12, no. 22 (2019): 3751. http://dx.doi.org/10.3390/ma12223751.

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Ti–Al matrix alloy reinforced with a high content of boron was fabricated by using a high-temperature alloying method and powder metallurgy technique (P/M). The preparation method of Ti–Al–B alloying powder was put forward. Phases, microstructure, and mechanical properties of the alloys were investigated. Wear and friction performance were studied by using a ball-on-disc tribotester sliding against a Si3N4 ceramic ball from 23 °C (room temperature) to 900 °C. The Ti–Al–B alloy had a higher specific strength than that of the Ti–Al alloy. The boron element obviously enhanced the wear resistance
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40

Ucar, Nazim, Sule Dogan, Mustafa Serdar Karakas, and Adnan Calik. "Boriding of Binary Ni–Ti Shape Memory Alloys." Zeitschrift für Naturforschung A 71, no. 11 (2016): 1017–20. http://dx.doi.org/10.1515/zna-2016-0289.

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AbstractBoriding of binary Ni–Ti shape memory alloys was carried out in a solid medium at 1273 K for 2, 4, 6, and 8 h using the powder pack method with proprietary Ekabor–Ni powders. Characterization of the boride layer formed on the surface of alloys was done by optical microscopy and scanning electron microscopy. The presence of boride, silicide, and borosilicide phases in the boride layers was confirmed by X-ray diffraction analysis. The thickness and microhardness of the boride layers increased with increasing boriding time. Hardness profiles showed a rapid decrease in hardness moving from
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41

Matveev, Alexey, Ilya Zhukov, Mansur Ziatdinov, and Alexander Zhukov. "Planetary Milling and Self-Propagating High-Temperature Synthesis of Al-TiB2 Composites." Materials 13, no. 5 (2020): 1050. http://dx.doi.org/10.3390/ma13051050.

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The paper explores the influence of planetary milling on the temperature and velocity of Al-Ti-B powder mixture combustion and also on the structure and phase composition of the reaction products. It is found that the time increase of planetary milling modifies the structure of the powder particles, improves the density of compacted specimens, and increases the temperature and velocity of their combustion. These time dependences are extreme, with maximum values during 180 s planetary milling. Experiments show that the reaction products consist of an aluminum matrix with uniformly distributed p
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42

Li, Feng Hua, Xiao Hong Yi, Jing Lei Zhang, and Zhan Guo Fan. "Study on Rare Earth Catalysis in the Boriding Process to Titanium Alloy." Applied Mechanics and Materials 48-49 (February 2011): 1177–81. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.1177.

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Solid powder boriding experiment was carried out on TC4 titanium alloy surface with method of RE(rare earth)-boriding at the temperature of over 1000°C. By means of XRD, SEM and EDS, phase composition, microstructure and morphology of TC4 titanium alloy after RE-boriding were investigated. The effect of rare earth on phase composition was discussed. Results of the experiment showed that the diffusion layer was composed of top-layer TiB2 and sub-layer TiB whiskers with the highest thickness being 25μm. The XRD results revealed TiB-TiB2 biphasic B-Ti compounds layer formed on the surface of TC4
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43

Olevsky, F., P. Mogilevsky, E. Y. Gutmanas, and I. Gotman. "Synthesis ofin situ TiB2/TiN ceramic matrix composites from dense BN-Ti and BN-Ti-Ni powder blends." Metallurgical and Materials Transactions A 27, no. 8 (1996): 2071–79. http://dx.doi.org/10.1007/bf02651860.

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44

Wakashima, Kenji, T. Shimoyamada, H. Noma, Tomonari Inamura, and Hideki Hosoda. "In Situ Synthesis and Properties of Aluminum Composites with Ultrafine TiB2 and Al2O3 Particulates." Materials Science Forum 475-479 (January 2005): 925–28. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.925.

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In this paper, we describe our recent work on metal matrix composites (MMCs) with submicron-size TiB2 and Al2O3 particulates that are synthesized in situ from Al-rich Al-Ti-B and Al-TiO2- B powder reactants by reactive sintering. Reaction sequences examined in the two different reactant systems are summarized, and some experimental results on elevated-temperature properties, i.e. thermal expansion, temperature dependence of dynamic tensile modulus and creep behavior, are shown and discussed from micromechanics-based viewpoints.
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45

Sharifi, E. Mohammad, F. Karimzadeh, and M. H. Enayati. "Preparation of Al2O3–TiB2 nanocomposite powder by mechanochemical reaction between Al, B2O3 and Ti." Advanced Powder Technology 22, no. 4 (2011): 526–31. http://dx.doi.org/10.1016/j.apt.2010.07.010.

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46

Li, Jun Shou, Su Li, Fang Zhao, and Ming Yuan Wang. "Synthesis and Characterization of Ti3SiC2 Matrix Multiphase Ceramic." Key Engineering Materials 602-603 (March 2014): 503–6. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.503.

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Titanium powder, silicon powder and carbon powder were used for the preparation of Ti3SiC2 matrix multiphase ceramic by self-propagating high temperature synthesis method (SHS) in air condition. The product was examined by XRD for qualitative and quantitative analysis, SEM for morphology analysis and infrared spectroscopy for transmittance analysis. It was shown in the research that product which was with titanium powder, silicon powder, and carbon powder as raw material was consist of three phases, Ti3SiC2 (76.6 wt%), TiC (21.2 wt%) and TiSi2 (2.2 wt%). TiC phase and TiSi2 phase distributed o
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47

Zherebtsov, Sergey, Maxim Ozerov, Margarita Klimova, Dmitry Moskovskikh, Nikita Stepanov, and Gennady Salishchev. "Mechanical Behavior and Microstructure Evolution of a Ti-15Mo/TiB Titanium–Matrix Composite during Hot Deformation." Metals 9, no. 11 (2019): 1175. http://dx.doi.org/10.3390/met9111175.

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A Ti-15Mo/TiB titanium–matrix composite (TMC) was produced by spark plasma sintering at 1400 °C under a load of 40 MPa for 15 min using a Ti-14.25(wt.)%Mo-5(wt.)%TiB2 powder mixture. Microstructure evolution and mechanical behavior of the composite were studied during uniaxial compression at room temperature and in a temperature range of 500–1000 °C. At room temperature, the composite showed a combination of high strength (the yield strength was ~1500 MPa) and good ductility (~22%). The microstructure evolution of the Ti-15Mo matrix was associated with the development of dynamic recovery at 50
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48

Fan, Xiao Hong, Lin Geng, Bin Xu, and Jing Li. "Laser Cladding NiCrBSi+2%B4C Coating on Ti-6Al-4V." Advanced Materials Research 79-82 (August 2009): 473–76. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.473.

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A process of laser cladding of NiCrBSi+2%B4C powder on Ti–6Al–4V substrate to form a coating was carried out, a good coating without cracks and pores was obtained in the process. The microstructure and component of the coating were examined using SEM and EPMA. The interface between the coating and the substrate was metallurgical, The microstructure of NiCrBSi+2%B4C cladding layer consisted of the Ni-based matrix, and the uniformly dispersed reinforcement phases of TiB2, TiC, etc. The microhardness of the coating was measured using a Vickers hardness tester. The average microhardness of the com
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49

Kobashi, Makoto, and Naoyuki Kanetake. "Novel Processing of Porous Titanium Composite for Producing Open Cell Structure." Materials Science Forum 539-543 (March 2007): 1004–9. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1004.

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Processing technique to produce open-cell porous titanium composite was developed. One of the outstanding benefits of porous titanium composite is both physical and mechanical properties can be controlled widely by changing the metal/ceramic fraction and cell structures. In this work, porous titanium composite was fabricated by a chemical reaction between titanium powder and boron carbide (B4C) powder. The reactions between titanium and B4C generates a large amount of latent heat and, therefore, it was a combustion and self-propagating mode. Precursors were made by compacting the starting powd
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50

Umeda, Junko, Lei Jia, Biao Chen, et al. "Precipitation and Distribution Behavior of In Situ-Formed TiB Whiskers in Ti64 Composites Fabricated by Selective Laser Melting." Crystals 11, no. 4 (2021): 374. http://dx.doi.org/10.3390/cryst11040374.

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The precipitation and distribution behaviors of in situ-formed titanium boride whiskers (TiB) in TiBw-reinforced Ti-6%Al-4%V (Ti64) composites fabricated from an elemental mixture of Ti64 alloy powder and TiB2 particles by selective laser melting were investigated. The primary precipitation of TiB whiskers strongly depends on B content. For a B content of less than 2 mass%, when the liquid → β-phase transformation occurred and B atoms were discharged, the B-enriched area formed around the β-phase resulted in the generation of TiB whiskers and their agglomeration at the prior β-grain boundaries
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