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Artykuły w czasopismach na temat „L12 ordered precipitates”

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Data publikacji: 6 września 2023

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1

Sun, Yuanyang, Yuhong Zhao, Huijun Guo, Xiaolin Tian та Hua Hou. "Early Stages of Precipitation in γ' Phase of a Ni–Al–Ti Model Alloy: Phase-Field and First-Principles Study". Science of Advanced Materials 12, № 5 (2020): 746–54. http://dx.doi.org/10.1166/sam.2020.3716.

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The early stages of precipitation process of the γ' phase of a Ni–Al–Ti alloy are investigated by microscopic phase-field and first-principles calculations. The simulated results indicate that a pre-precipitate with L10 structure appears before the L12 ordered phase, and then this metastable phase gradually transforms to L12 ordered phase; finally, the precipitated phase is composed of γ' ordered phase and γ matrix phase. The occupation probabilities of Al, Ni, and Ti atoms also illustrate the formation of the L10 phase and its situ conversion to L12 ordered phase constituted by a complicated

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2

Doi, Minoru. "Two-Phase Microstructures Formed by Phase-Separation of Coherent Precipitates in Elastically Constrained Alloy Systems." Materials Science Forum 638-642 (January 2010): 2215–20. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.2215.

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Coherent two-phase microstructures consisting of ordered precipitate and disordered matrix phases sometimes exhibit a phase-separation, which brings the split and/or the decelerated coarsening of precipitates. When the coherent two-phase microstructure of A1+L12 (+’) in Ni-base alloys are aged inside the two-phase region of A1+L12 , the L12 precipitate sometimes exhibit a phase-separation and A1 phase newly appears and grows in each L12 precipitate. Phase-separations of the same type to the above also take place due to ageing of coherent two-phase microstructures of A2+D03 and A2+B2 in Fe-ba

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3

Zhao, Bing Bing, Xian Ping Dong, Feng Sun, and Lan Ting Zhang. "Impact of L1₂-Ordered Precipitation on the Strength of Alumina-Forming Austenitic Heat-Resistant Steels." Materials Science Forum 941 (December 2018): 692–97. http://dx.doi.org/10.4028/www.scientific.net/msf.941.692.

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Alumina-forming austenitic (AFA) heat-resistance steels firstly developed by Yamamoto et al. at Oak Ridge National Laboratory have been reported as a new promising class of steels with potential for use in high temperature applications in recent years. The creep resistance of AFA steels is improved mainly by precipitation strengthening. Besides modifying the typical existing precipitates, i.e. MC and M23C6 type carbides, B2-NiAl and Fe2Nb-type Laves phase, introduction of coherent L12-ordered precipitate is highly desired. L12-ordered phase gamma prime (γ’) is the most important precipitate fo

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4

De Hosson, J. T. M. "Superlattice dislocations in L12 ordered alloys and in alloys containing L12 ordered precipitates." Materials Science and Engineering 81 (August 1986): 515–23. http://dx.doi.org/10.1016/0025-5416(86)90288-0.

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5

Gayle, Frank W., and John B. VanderSande. "Characterization of Rapidly Solidified Aluminum-Lithium Alloys." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 26–29. http://dx.doi.org/10.1017/s0424820100117224.

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Aluminum-lithium alloys are presently the subject of much research due to the effectiveness of lithium in reducing density, raising elastic modulus and providing for high strength. The strengthening precipitate is the metastable, L12-ordered Al3Li (Cu3Au prototype), or δ'. In binary alloys, δ’ precipitates homogeneously with a spherical shape, coherent with the aluminum matrix. These lithium-containing alloys suffer from poor ductility and fracture toughness, however, which has been attributed to 1) the shear-able nature of the δ’ precipitate, resulting in work softening and slip localization

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6

Moritani, Tomokazu, Masahiro Ota, Takao Kozakai, and Minoru Doi. "TEM Observations of Two-Phase Microstructure Formed by Phase Separation of Gamma-Prime Precipitates in Ni-Al-Si Alloys." Materials Science Forum 561-565 (October 2007): 2361–64. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2361.

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The phase-separation behaviour of γ’ precipitates in Ni-7.1Al-6.7Si alloy was investigated by means of transmission electron microscopy (TEM). When the alloy is aged at 1173K, coherent spherical γ’ particles having ordered L12 structure appear in γ matrix having disordered A1 structure. When the two-phase microstructure of γ + γ’ is aged at 973K, spherical γ particles precipitate in the individual γ’ precipitates. In the course of ageing at 973K, the new γ particles grow keeping the spherical shape, their number gradually decreases and finally γ particles aging at 1173K gradually change their

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7

Wang, Rui, Yilei Fu, Guoliang Xie, Zifan Hao, Shuai Zhang, and Xinhua Liu. "The Microstructure and Mechanical Properties of Cu-20Ni-20Mn Alloy Fabricated by a Compact Preparation Process." Metals 10, no. 11 (2020): 1528. http://dx.doi.org/10.3390/met10111528.

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A novel compact preparation process has been developed to produce a Cu-20Ni-20Mn alloy. This process involves heating-cooling combined mould (HCCM) continuous casting, a solution treatment at 800 °C, rolling at room temperature and a final ageing step at 450 °C. This process eliminates two hot deformation processes, namely, hot forging and hot rolling, greatly improving production efficiency and reducing production costs compared with the traditional preparation process. The alloy fabricated by this process was found to have excellent mechanical properties. Additionally, the formation of preci

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8

Jang, Ok Jun, Cheol-Woong Yang, and Dong Bok Lee. "Transmission Electron Microscopy Characterization of Thermomechanically Treated Al3Ti–(8, 10, 15)% Cr Intermetallics." Microscopy and Microanalysis 19, S5 (2013): 89–94. http://dx.doi.org/10.1017/s1431927613012403.

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AbstractThe ordered L12-type Al3Ti–(8, 10, 15)% Cr intermetallic compounds, namely, Al67Ti25Cr8, Al66Ti24Cr10, and Al59Ti26Cr15, were prepared by induction melting followed by thermomechanical treatment. Their microstructure, compositional variation, and crystal structure were characterized using X-ray diffraction, optical microscopy, and scanning and transmission electron microscopy equipped with energy-dispersive spectroscopy. The Al67Ti25Cr8 alloy consisted of the L12-Al3Ti matrix and precipitates of α2-Ti3Al, D022-Al3Ti, and γ-TiAl. The Al66Ti24Cr10 and Al59Ti26Cr15 alloys consisted of the

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9

Eggeler, Y. M., K. V. Vamsi, and T. M. Pollock. "Precipitate Shearing, Fault Energies, and Solute Segregation to Planar Faults in Ni-, CoNi-, and Co-Base Superalloys." Annual Review of Materials Research 51, no. 1 (2021): 209–40. http://dx.doi.org/10.1146/annurev-matsci-102419-011433.

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The mechanical properties of superalloys are strongly governed by the resistance to shearing of ordered precipitates by dislocations. In the operating environments of superalloys, the stresses and temperatures present during thermomechanical loading influence the dislocation shearing dynamics, which involve diffusion and segregation processes that result in a diverse array of planar defects in the ordered L12 γ′ precipitate phase. This review discusses the current understanding of high-temperature deformation mechanisms of γ′ precipitates in two-phase Ni-, Co-, and CoNi-base superalloys. The s

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10

Vorontsov, V. A., R. E. Voskoboinikov, and Catherine M. F. Rae. "Prediction of Mechanical Behaviour in Ni-Base Superalloys Using the Phase Field Model of Dislocations." Advanced Materials Research 278 (July 2011): 150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.278.150.

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The “Phase-Field Model of Dislocations” (PFMD) was used to simulate shearing of gamma-prime precipitate arrays in single crystal turbine blade superalloys. The focus of the work has been on the cutting of the L12 ordered precipitates by a<112>{111} dislocation ribbons during Primary Creep. The Phase Field Model presented incorporates specially developed Generalised Stacking Fault Energy (–surface) data obtained from atomistic simulations. The topography of this surface determines the shearing mechanisms observed in the model. The merit of the new –surface, is that it accounts for the f

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11

Rakoczy, Łukasz, Bogdan Rutkowski, Małgorzata Grudzień-Rakoczy, Rafał Cygan, Wiktoria Ratuszek та Anna Zielińska-Lipiec. "Analysis of γ′ Precipitates, Carbides and Nano-Borides in Heat-Treated Ni-Based Superalloy Using SEM, STEM-EDX, and HRSTEM". Materials 13, № 19 (2020): 4452. http://dx.doi.org/10.3390/ma13194452.

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The microstructure of a René 108 Ni-based superalloy was systematically investigated by X-ray diffraction, light microscopy, energy-dispersive X-ray spectroscopy, and electron microscopy techniques. The material was investment cast in a vacuum and then solution treated (1200 °C-2h) and aged (900 °C-8h). The γ matrix is mainly strengthened by the ordered L12 γ′ phase, with the mean γ/γ′ misfit, δ, +0.6%. The typical dendritic microstructure with considerable microsegregation of the alloying elements is revealed. Dendritic regions consist of secondary and tertiary γ′ precipitates. At the interfa

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12

Wu, Xiao Lan, Zuo Ren Nie, Sheng Ping Wen, Kun Yuan Gao, and Hui Huang. "New Progress on Er-Containing Micro-Alloying Aluminum Alloys." Materials Science Forum 877 (November 2016): 211–17. http://dx.doi.org/10.4028/www.scientific.net/msf.877.211.

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Erbium is an effective micro-alloying element in aluminum alloys and has been investigated intensively. Similar with the addition of Sc in aluminum alloys, nanosized L12-ordered Al3Er precipitates were formed coherently with the matrix in Er-containing micro-alloying aluminum alloys. Further, in the case of the addition of both Er and Zr, core-shell-structured Al3(ZrxEr1−x) precipitates, instead of Al3Er, were observed in a fine dispersion. Those thermally-stable precipitates can refine the grain size, minimize the segregation, homogenize the microstructure, enhance the strength, hinder the re

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13

Lin, L. S., G. W. Levan, S. M. Russell, and C. C. Law. "Effect of hafnium addition on a Ni-Al-Co Alloy." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 940–41. http://dx.doi.org/10.1017/s0424820100177830.

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Recent efforts at P&W have shown that the addition of cobalt to binary NiAl results in an appreciable increase in room temperature ductility. One version of this ternary alloy, designated VIM A, has a composition of Ni-30 at.% Al-35 at.% Co. The addition of 0.5 at.% Hf to this alloy (designated VIM AH) results in an improvement in yield strength at 760°C. Room temperature properties were not found to be significantly affected by the Hf addition. This discussion will focus on the microstructures of alloys VIM A and VIM AH and their relationship to the mechanical properties observed in compr

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14

Ohno, Katsumi, Tadaharu Yokokawa, Toshihiro Yamagata, Hiroshi Harada, Michio Yamazaki та Kazumasa Ohsumi. "Determination of the Coherency Strain of γ and γ′ Phases in Nickel-Base Superalloys at High Temperatures". Advances in X-ray Analysis 36 (1992): 515–26. http://dx.doi.org/10.1154/s0376030800019145.

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AbstractA method for using syncrotoron-radiation parallel-beam X-ray diffractometry for precise lattice parameters and strains of γ-γ′ type Nickel base superalloys at elevated temperature is described. The superalloys have γ′ precipitates which are an ordered L12 structure based on Ni3Al, in y-matrices having a disordered FCC structure. Lattice misfit between γ and γ′ phases was very small and peaks reflected from γ and γ′ phases made unresolved clusters of peaks.Profile fitting with a pseudo-Voigt function is used to resolve overlapping peaks. Instrumental broadening of the peak profile was r

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15

Lin, L. S., G. W. Levan, S. M. Russell, and C. C. Law. "Effect of titanium addition on a Ni-Al-Co alloy." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 938–39. http://dx.doi.org/10.1017/s0424820100177829.

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AEM examinations of a NiAlCo alloy of composition Ni-29 at.% Al-21 at.% Co after room temperature compression show that the microstructure consists of a twinned tetragonal matrix (L10, marked A in Figure 1a) and ordered fcc gamma prime precipitates (L12, marked B in Figure 1a) along grain boundaries. The compressive yield strengths of this alloy at room temperature and 760°C are 754 MPa and 163 MPa respectively. It also has superior room temperature ductility as compared to binary NiAl. An addition of 5 at.% Ti at the expense of Ni was made to this alloy in order to increase the yield strength

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16

Lee, Kap Ho, Yeung Jo Lee, and Kenji Hiraga. "Precipitation behavior in the early stage of aging in an Al–Li°Cu–Mg–Zr–Ag (Weldalite 049) alloy." Journal of Materials Research 14, no. 2 (1999): 384–89. http://dx.doi.org/10.1557/jmr.1999.0056.

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The precipitation behavior of various phases during the aging process of an Ag–Li°Cu–Mg–Zr–Ag (Weldalite 049) alloy was investigated by high-resolution electron microscopy and in situ hot-stage microscopy. Two kinds of domains with L12-type ordered structures, which are considered to be δ′ and β′ phases, are observed with different domain sizes in the alloy quenched from 530 °C. In the early stage of aging at 190 °C, the δ′ phase is precipitated as surrounding the β' phase, and the δ′ domains appear with in-phase and antiphase relationships to the β′ lattices. In situ observations at 190 °C cl

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17

Inuzuka, Yusuke, Shogo Ito, Takao Kozakai, and Minoru Doi. "TEM Observations of Precipitation of Coherent L1₂ and D0₂₂ Ordered Phases in Ni-V-Ge Alloys." Materials Science Forum 561-565 (October 2007): 2365–68. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2365.

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Phase separations of A1 (γ) supersaturated solid solution into γ, cubic-L12 (γ') and tetragonal-D022 (γ") phases were investigated in Ni-V-Ge alloys by means of transmission electron microscopy (TEM). When Ni-15.8at%V-9.0at%Ge alloy is aged at 1073 K, at the early stage of ageing γ" phases are observed in the γ matrix as triangle- or diamond-shaped precipitates. With further ageing, colonies of lamellar structure consisting of two variants of γ" phase are dispersedly formed in the γ matrix and then γ" plates grow along the <110> direction. When Ni-14.5at%V-8.8.at%Ge alloy is isothermally

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18

Xia, ChangMing, LePing Bu, and Qi Zhou. "Annealing hardening behaviour of cold rolled Al_0.5CoNiCu high-entropy alloy." Journal of Physics: Conference Series 2338, no. 1 (2022): 012050. http://dx.doi.org/10.1088/1742-6596/2338/1/012050.

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Abstract The usually, softening occurs when metals are annealed, while for some special metals or alloys, the abnormal phenomenon of annealing hardening will occur. By means of X-ray diffraction (XRD), metallographic (OM) observation, transmission electron microscopy (TEM) and hardness test, the microstructure and hardness of 79% cold rolled Al0.5CrFeCoNiCu high entropy alloy was studied after isothermal annealing for 1 hour at different temperatures, which revealed the cause of annealing induced hardening of the alloy. The results show that the homogenized high-entropy alloy is a face centere

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19

Miyasato, Shelly. "Characterization of the microstructures produced by different solutionizing quench rates in aluminum-lithium alloys." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 966–67. http://dx.doi.org/10.1017/s0424820100177969.

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The microstructure in lightweight aluminum-lithium alloys produced by two different quench rates after solution heat treatment were investigated using conventional transmission electron microscopy (TEM) and high resolution electron microscopy (HREM). The formation mechanism, size and distribution of the phase δ’ (Al3Li) were compared, since the precipitate affects many of the mechanical properties in the age- hardening Al-Li system. The metastable δ’ phase has the L12 ordered structure based on the fcc lattice with a lattice parameter difference of -0.08% with the aluminum matrix. The equilibr

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20

Jockweg, J., та E. Nembach. "Anisotropy of the critical resolved shear stress of a superalloy containing 6 vol.% L12-ordered γ′-precipitates". Acta Metallurgica et Materialia 43, № 9 (1995): 3295–300. http://dx.doi.org/10.1016/0956-7151(95)00046-x.

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21

Gwalani, B., V. Soni, D. Choudhuri, et al. "Stability of ordered L12 and B2 precipitates in face centered cubic based high entropy alloys - Al0.3CoFeCrNi and Al0.3CuFeCrNi2." Scripta Materialia 123 (October 2016): 130–34. http://dx.doi.org/10.1016/j.scriptamat.2016.06.019.

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22

Tin, S., L. Zhang, A. P. Ofori, and Michael K. Miller. "Atomic Partitioning of Platinum and Ruthenium in Advanced Single Crystal Ni-Based Superalloys." Materials Science Forum 546-549 (May 2007): 1187–94. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1187.

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The elemental partitioning characteristics of advanced single crystal Ni-base superalloys containing additions of both Pt and Ru have been investigated using atom probe tomography. Detailed microanalysis revealed Ru additions partitioned preferentially to the disordered matrix, whereas Pt additions tended to partition to the ordered intermetallic γ′ precipitates. The partitioning characteristics of three nominally similar alloys with systematic variations in the levels of Cr, Ru and Pt were investigated. For this particular set of experimental alloys, minor changes in the partitioning characte

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23

Yang, R., J. A. Leake, and R. W. Cahn. "A microstructural study of a Ni2AlTi–Ni(Al, Ti)–Ni3(Al, Ti) three-phase alloy." Journal of Materials Research 6, no. 2 (1991): 343–54. http://dx.doi.org/10.1557/jmr.1991.0343.

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Early studies showed that the two-phase ordered alloy of semi-coherent β–Ni2AlTi (L21) and β–Ni(Al, Ti) (B2) exhibits excellent elevated-temperature creep strength, and the precipitation of the “rod-like” γ'–Ni3(Al, Ti) (L12) from either the β or the β' phase improves the room-temperature ductility of the phases concerned. In the present investigation an attempt is being made to combine the above microstructural features in β'–β–γ' three-phase alloys and for this purpose the composition Ni63Al22Ti15, near the β'–γ' edge of the three-phase region in the recently estimated Ni–Al–Ti isotherm at 9

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24

Yang, Y., P. Mukherjee, and P. Sanders. "Precipitation Hardening via Chemically Ordered L12 Precipitates in Al-Sc-Zr Alloys— New Insights Using Combined STEM and EDS Study." Microscopy and Microanalysis 25, S2 (2019): 2188–89. http://dx.doi.org/10.1017/s143192761901167x.

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25

Zarkevich, Nikolai A., Timothy M. Smith, Eli N. Baum, and John W. Lawson. "Compositional Glass: A State with Inherent Chemical Disorder, Exemplified by Ti-rich Ni3(Al,Ti)1 D024 Phase." Crystals 12, no. 8 (2022): 1049. http://dx.doi.org/10.3390/cryst12081049.

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A compositional glass is a state with an unavoidable disorder in chemical compositions on each site, characterized by frustration and freezing of the compositional degrees of freedom at low temperature. From this state a full atomic long-range order is unachievable by a reasonable thermodynamic treatment. There is a similarity between a spin glass (a magnetic state with disorder in spin orientations) and a compositional glass (with disorder in site occupations by chemical elements): both have frustrated ground states and a frozen disorder at low temperatures T < Tf (here Tf is called the fr

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26

de Sá, Maria H., Iikka Isomäki, Jorge A. Ferreira, Marko Hämäläinen, and Maria H. Braga. "Experimental and First Principles Study of the Ni-Ti-W System." Materials Science Forum 730-732 (November 2012): 775–80. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.775.

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Nickel based superalloys are structural materials with a chemical composition and structure which has been developed to enable good high temperature performances leading to a wider range of applications. Their unique properties are due to their microstructure characterized by the coexistence of L12-ordered intermetallic precipitates like Ni3Al or Ni3Ti - g’ phase - in a face-centered cubic nickel based solid solution matrix, (Ni) - g phase. Solid solution strengthening at high temperatures can also be provided by the addition of refractory alloying elements, like tungsten, W. Therefore, the me

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27

Liu, W., T. Pretorius, H. Rösner, D. Rönnpagel та E. Nembach. "TEM observation and computer simulation of the interaction of superlattice dislocations with disordered γ-precipitates in L12-ordered γ′-(Ni,Co)3(Al,Ti) intermetallics". Materials Science and Engineering: A 234-236 (серпень 1997): 687–91. http://dx.doi.org/10.1016/s0921-5093(97)00374-2.

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Kozakai, Takao, Daisuke Sakurai, and Minoru Doi. "Substitution Effect of the Third Element X on the Morphology of A1/L1₂/D0₂₂ Three-Phase Microstructure in Ni-V-X (X=Si, Al) Alloy." Solid State Phenomena 172-174 (June 2011): 236–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.236.

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Morphology of phase-separated microstructure consisting of cubic disordered A1 and ordered L12 phases and tetragonal ordered D022 phase in Ni-V-X (X=Al, Si) alloys has been investigated by transmission electron microscopy. Ternary Ni-V-Al alloy showed the lamellar structure of D022 phase with spherical L12 particles, while Ni-V-Si ternary alloy indicated the anisotropic microstructure consisting of plate- or diamond-shaped D022 and plate-shaped L12 phases. When a part of element Al is substituted by Si, the morphology of three-phase microstructure (A1/L12/D022) varied depending on the amount o

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Himuro, Yoshiyuki, Katsumi Koyama, and Yoichiro Bekki. "Precipitation Behaviour of Zirconium Compounds in Zr-Bearing Al-Mg-Si Alloy." Materials Science Forum 519-521 (July 2006): 501–6. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.501.

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In commercial aluminum alloys, Zr is recognized as an important additional element improving their properties such as strength, corrosion resistivily, and so on. It forms very fine particles of the metastable Al3Zr phase with L12 ordered configuration, in the case of alloys without Si. On the other hand, the DO22-type (Al, Si)3Zr phase besides the L12-type Al3Zr phase is precipitated in alloys including large amounts of Si, such as 6000 series. In this study the main stress falls on precipitation behavior of these Zr compounds in a Zr bearing Al-Mg-Si alloy. The Al-0.67Mg-0.97Si-0.37Zr alloy w

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30

Yao, Q., H. Xing, and J. Sun. "Structural stability and elastic property of the L12 ordered Co3(Al,W) precipitate." Applied Physics Letters 89, no. 16 (2006): 161906. http://dx.doi.org/10.1063/1.2362574.

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Tian, W. H., T. Sano, and M. Nemoto. "Structure of perovskite carbide and nitride precipitates in L10-ordered TiAl." Philosophical Magazine A 68, no. 5 (1993): 965–76. http://dx.doi.org/10.1080/01418619308219379.

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Kaneno, Y., T. Nakamura, H. Inoue, and T. Takasugi. "Effect of precipitated Co solid solution on moisture-induced embrittlement of L12-type Co3Ti ordered alloys." Acta Materialia 51, no. 7 (2003): 2113–23. http://dx.doi.org/10.1016/s1359-6454(03)00013-2.

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Makineni, Surendra Kumar, Mahander Pratap Singh, and Kamanio Chattopadhyay. "Low-Density, High-Temperature Co Base Superalloys." Annual Review of Materials Research 51, no. 1 (2021): 187–208. http://dx.doi.org/10.1146/annurev-matsci-080619-014459.

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Co base superalloys strengthened by coherent L12 ordered γ′ precipitate in a disordered face-centered cubic γ matrix represent a new opportunity for high-temperature alloy development. The emergence of alloys with low density and high specific yield strength at elevated temperatures has further energized the research and development efforts in the last 5 years. Initially stabilized by the addition of small amounts of Nb and Ta, these new generations of alloys with multiple alloying additions to form basic quaternary and ternary alloys have steadily expanded the property envelopes to raise hope

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Donlon, W. T., W. E. Dowling, C. E. Cambell, and J. E. Allison. "The effect of thermal exposure on precipitation of Ti3Al(C,N) in Ti-48Al-IV-0.2C." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 1 (1992): 22–23. http://dx.doi.org/10.1017/s0424820100120515.

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Titanium aluminides are attractive candidates for high temperature structural applications because of their high strength to weight ratio at elevated temperatures. The microstructure of these alloys consists of γ-TiAl (distorted L10 structure) , plus α2-Ti3Al (ordered DO19 structure). Varying the heat treatment temperature and cooling rate of these alloys alters the volume fraction and distribution of the γ and α2 phases. This has significant effects on the room temperature ductility. In addition, precipitation of carbides has been observed during high temperature exposure. The effect of these

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Kim, Yong Hwan, Mitsuo Niinomi, Junko Hieda, Masaaki Nakai та Hisao Fukui. "Microstructural Change of β′ Phase and Hardness Change in As-Solutionized Dental Ag-20Pd-12Au-14.5Cu Alloy". Key Engineering Materials 508 (березень 2012): 166–71. http://dx.doi.org/10.4028/www.scientific.net/kem.508.166.

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Change in the Microstructure of the L10-Type Ordered β' Phase Precipitated in Ag-20Pd-12Au-14.5Cu Alloy (mass%) Subjected to Solution Treatment with Varying Solution Treatment Time Was Investigated. The Size of the β' Phase Is Found to Decrease with Increasing Solution Treatment Time and the Vickers Hardness of the Alloy after Solution Treatment Decreases. Experimental Observations Show that the Microstructural Change of the β' Phase Strongly Contributes to the Change in Vickers Hardness. In Addition, the Formation and Growth of the β' Phase Are Concluded to Be Affected by the Distribution of

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Maziarz, Wojciech, Jan Dutkiewicz, Rafał Wróblewski та Marcin Leonowicz. "Microstructure and Magnetic Properties of Two Phase β+γ Ferromagnetic Co-Ni-Al Alloys". Solid State Phenomena 154 (квітень 2009): 145–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.154.145.

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The microstructure, texture and magnetic properties of two ferromagnetic alloys of composition Co35Ni37Al28 and Co37Ni35Al28 (in at. %) were investigated with optical microscopy (OM), analytical transmission electron microscopy (TEM), scanning electron microscopy (SEM) techniques as well as a vibrating sample magnetometer (VSM). The alloys were plastically deformed and heat treated in order to promote the martensitic transformation. Differential scanning calorimetry (DSC) revealed a drop of Ms temperature due to the increase of Co content in the alloys. The elongated twinned grains of size abo

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Cantando, Elizabeth D., Gerard M. Ludtka, Gail Mackiewicz-Ludtka, and William A. Soffa. "Electron Microscopy Study of Hypostoichiometric Fe-Pd Nanocomposites Resulting from Combined Reactions Thermomechanical Processing." Solid State Phenomena 172-174 (June 2011): 356–61. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.356.

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Hypostoichiometric Fe-Pd binary alloys (35-45 at% Pd) were severely deformed (>90%) and subsequently aged to induce concomitant recrystallization, precipitation, and ordering. This thermomechanical processing strategy was articulated by Hornbogen [1] over thirty years ago. The resulting exchange-coupled ferromagnets contain ferrite precipitates and a complex metastable two-phase lamellar transformation product comprised of ordered L10 and a metastable FCC phase. The later duplex microconstituent is suggested to form in conjunction with a so-called pseudospinodal reaction [2] involving emerg

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Tian, Wen Huai, Takeshi Sano, and Minoru Nemoto. "Hardening Mechanisms in a γ′-L1₂ Ordered Phase Containing Disordered γ Precipitates." Journal of the Japan Institute of Metals 53, no. 10 (1989): 1029–34. http://dx.doi.org/10.2320/jinstmet1952.53.10_1029.

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Tian, Wen Huai, Takeshi Sano, and Minoru Nemoto. "Temperature Dependence of the Yield Stress in γ′-L1₂ Ordered Ni₃(Al, Ti) Single Crystals Containing Disordered γ Precipitates." Journal of the Japan Institute of Metals 54, no. 3 (1990): 276–84. http://dx.doi.org/10.2320/jinstmet1952.54.3_276.

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Tian, Wen Huai, Takeshi Sano, and Minoru Nemoto. "Orientation Dependence of the Yield Stress in γ′-L1₂ Ordered Ni₃(Al, Ti) Single Crystals Containing Disordered γ Precipitates." Journal of the Japan Institute of Metals 54, no. 3 (1990): 285–91. http://dx.doi.org/10.2320/jinstmet1952.54.3_285.

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Tian, Wen Huai, Takeshi Sano, and Minoru Nemoto. "Deformation Induced Microstructure of L1₂ Ordered γ′-Ni₃(Al, Ti) Single Crystals Containing Fine Dispersion of Disordered γ Precipitates." Journal of the Japan Institute of Metals 53, no. 10 (1989): 1022–28. http://dx.doi.org/10.2320/jinstmet1952.53.10_1022.

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Doi, Minoru, Hiroshi Kumagai, Kanako Nakashima, and Takao Kozakai. "Phase-Separations of Coherent Precipitates of Ordered Phases in Elastically Constrained Alloys." MRS Proceedings 980 (2006). http://dx.doi.org/10.1557/proc-980-0980-ii05-26.

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AbstractPhase-separations of coherent precipitates of ordered phases were investigated by means of transmission electron microscopy (TEM) and the theoretical analysis from a thermodynamic point of view. When the two-phase microstructures of A1+L12 in elastically constrained Ni-Al-Ti and Ni-Si-Fe alloys are isothermally heated inside the two-phase region of A1+L12 , coherent L12 precipitate particles sometimes exhibit a phase-separation and A1 phase newly appears and grows in L12 particles. Phase-separations of the same type as the above are also observed in coherent two-phase microstructures o

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Nemoto, M., W. H. Tian, and K. Hayashi. "Phase Decomposition and Deformation of L12-Ordered Co-Rich Co3Ti." MRS Proceedings 364 (1994). http://dx.doi.org/10.1557/proc-364-849.

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AbstractThe Co3Ti phase hardens appreciably by the fine precipitation of disordered fee Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope(TEM) observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {100} planes of the L12-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disordered Co-rich phase over the whole temperature range investigated. TEM observations of the underag

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Dasari, Sriswaroop, Abhishek Sharma, Stéphane Gorsse, Advika Chesetti, and Rajarshi Banerjee. "Non-classical nucleation of ordered L12 precipitates in the FCC based Al0.25CoFeNi high entropy alloy." Journal of Applied Physics 134, no. 1 (2023). http://dx.doi.org/10.1063/5.0138924.

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The complex interplay between competing phase stabilities of FCC, L12, BCC, and B2 phases in the Al0.25CoFeNi (7Al-31Co-31Fe-31Ni in at. %) high entropy alloy (HEA) leads to non-classical phase transformation pathways and resultant novel microstructures. Specifically, the competition between the homogenous precipitation of L12 and heterogenous precipitation of BCC/B2 can be studied at a temperature of 500 °C in the Al0.25CoFeNi alloy. Upon isothermally annealing the single FCC phase microstructure of this HEA at 500 °C up to 50 h, the transformation initiates with the formation of a transient

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Miller, M. K. "Characterization of the Early Stages of Phase Separation by Atom probe Tomography." MRS Proceedings 580 (1999). http://dx.doi.org/10.1557/proc-580-35.

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AbstractAn atom probe tomography characterization of the early stages of phase separation in the FeCu-Ni system has been performed. The development of the copper-enriched regions into copper precipitates has been investigated during isothermal ageing at 573 K and 673 K for times up to 10,000 h. The formation and growth of the secondary precipitates in the nickel based superalloy, Alloy 718, have been determined during isothermal ageing at 873 K. These secondary precipitates were found to be a mixture of the L12-ordered γ' phase and the DO22-ordered γ” phase.

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Cerri, A., R. Schmelczer, P. Schwander, G. Kostorz, and A. F. Wright. "Combined Use of Small Angle Neutron Scattering (Sans) and (Conventional and High Resolution) Electron Microscopy for the Characterization of Early Stages of Ordering and Phase Separation in Ni-Ti." MRS Proceedings 82 (1986). http://dx.doi.org/10.1557/proc-82-169.

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ABSTRACTThe decomposition of Ni ∼ 11.5 at.% Ti single crystals was studied for an ageing temperature of 540°C. In this alloy, coherent ordered zones of γ′-Ni3Ti (Cu3Au structure) are formed prior to the stable n precipitates. The early stages of zone formation were investigated by in-beam SANS and transmission electron microscopy (TEM). Electron diffraction, high resolution electron microscopy, TEM analysis of dislocation arrangements in samples deformed after ageing and X-ray measurements of the integrated intensity at L12 superstructure positions show that ordered regions already appear in q

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Ju, Yinfei, Yongsheng Li, Shujing Shi, Peng Sang, Huiyu Wang та Hongli Long. "Phase-Field Simulation of γ′-Co3 (Al, W) Evolution Kinetics with Antiphase Boundaries in Co-Based Monocrystal Superalloys". Frontiers in Materials 9 (30 березня 2022). http://dx.doi.org/10.3389/fmats.2022.872148.

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Antiphase boundaries (APBs) of L12 ordered γ′-Co3 (Al, W) precipitates have an essential effect on the high-temperature strength of Co-based monocrystal superalloys. In this work, the antiphase boundaries and their effects on the evolution kinetics of γ′ phase are studied with the phase-field model. The formation of APBs between γ′ phases with different crystallographic variants induces a sharp increase in free energy; the width of APBs measured by the edge-to-edge distances of the γ′ phase is consistent with the experimental results of superalloys. Also, a coupling behavior of Ostwald ripenin

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Sarkar, Suman, Shyam Kanta Sinha, Dhanalakshmi Palaniswamy, Chandan Srivastava, and Kamanio Chattopadhyay. "Evolution of L12 Ordered Precipitates in Cu–Fe–Si Alloy System and Its Influence on Potential Strength–Conductivity Properties." Metallography, Microstructure, and Analysis, February 17, 2023. http://dx.doi.org/10.1007/s13632-023-00938-2.

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Yasuda, Hiroyuki Y., Mitsuhiro Aoki, Kouki Fukushima, and Yukichi Umakoshi. "Pseudoelastic Behavior of Fe3Ga Single Crystals with D03 Structure." MRS Proceedings 980 (2006). http://dx.doi.org/10.1557/proc-980-0980-ii06-08.

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AbstractPseudoelastic behavior of Fe3Ga single crystals regardless of a thermoelastic martensitic transformation was investigated focusing on the dislocation structure and the phase constituent. Large pseudoelasticity of 5 % recoverable strain appeared in Fe3Ga single crystals sufficiently annealed in the D03 single-phase region. In the crystals, uncoupled and paired 1/4[111] superpartial dislocations moved dragging the nearest-neighbor (NN) and next-nearest neighbor (NNN) anti-phase boundaries (APBs) during loading, respectively. During unloading, these APBs pulled back the superpartials resu

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Jin, Chengyan, Xinghao Du, Wanpeng Li, et al. "Investigation on an anti-corrosion Cu-rich multiple-principal-element alloy strengthened and toughened by nano-scaled L1₂-type ordered particles." International Journal of Materials Research, May 18, 2022. http://dx.doi.org/10.1515/ijmr-2021-8677.

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Abstract In this study, the microstructure and mechanical properties of a Cu-rich multiple-principal-element alloy with the composition (Cu50Ni20Cr20Mn10)95Al5 (at.%) were investigated. It was found that after 900 °C/1 h annealing process, the as-cast alloy has achieved promising mechanical properties with a yield stress of 510 MPa, an ultimate tensile stress of 820 MPa and tensile elongation of 30 %. These properties are superior to those of traditional nickel–aluminum bronze (NAB) alloys. Moreover, the as-annealed alloy exhibited much better anti-corrosion properties with respect to the NBA

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