细晶Cr-NbCr_2合金的热稳定性（英文）
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摘要
研究了通过机械合金化+热压工艺制备的细晶Cr-NbCr_2合金的热稳定性。结果表明:热暴露过程中,Cr基体的颗粒尺寸有一定程度的长大,而Laves相NbCr_2颗粒由于其高热稳定性无明显变化。随着热暴露的进行,Cr基体颗粒与Laves相NbCr_2颗粒间压应力增加,使得基体和Laves相中分别出现了位错和层错/孪晶结构。颗粒尺寸的变化和晶体缺陷的出现,使得Cr-NbCr_2合金在800~1200℃热暴露50 h后仍具有较高的抗压强度,屈服强度和良好的塑性。但随着热暴露的继续延长,此时颗粒的长大成为主导因素,Cr-NbCr_2合金的屈服强度和塑性明显下降。
Thermal stability of the fine-crystal Cr-NbCr_2 alloy prepared by mechanical alloying and hot pressing was researched. The results show that the grain size of Cr matrix has a certain degree of growing up after the thermal exposure, while the particle size of Laves phase NbCr_2 has no obvious change due to its high thermal stability. At the same time, the dislocation in the Cr matrix and the stacking faults/twins in the Laves phase NbCr_2 particles appear in the as-thermally exposed microstructure because of the increase of the compressive stress between Cr matrix and NbCr_2 particles. Due to the variation in particle size and the occurrence of crystal defects, the Cr-NbCr_2 alloy can keep higher compressive strength, yield strength and plastic strain after thermal exposure from 800 °C to 1200 °C for 50 h. However, the yield strength and plastic strain of the Cr-NbCr_2 alloy decline obviously by prolonging the thermal exposure because the growth of grains becomes the determining factor of properties.
Thermal stability of the fine-crystal Cr-NbCr_2 alloy prepared by mechanical alloying and hot pressing was researched. The results show that the grain size of Cr matrix has a certain degree of growing up after the thermal exposure, while the particle size of Laves phase NbCr_2 has no obvious change due to its high thermal stability. At the same time, the dislocation in the Cr matrix and the stacking faults/twins in the Laves phase NbCr_2 particles appear in the as-thermally exposed microstructure because of the increase of the compressive stress between Cr matrix and NbCr_2 particles. Due to the variation in particle size and the occurrence of crystal defects, the Cr-NbCr_2 alloy can keep higher compressive strength, yield strength and plastic strain after thermal exposure from 800 °C to 1200 °C for 50 h. However, the yield strength and plastic strain of the Cr-NbCr_2 alloy decline obviously by prolonging the thermal exposure because the growth of grains becomes the determining factor of properties.
引文
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2 Li K W,Li S M,Xue Y L et al.International Journal of Refractory Metals and Hard Materials[J],2013,36:154
3 Syutkin E A,Jacob A,Schmetterer C et al.Thermochimical Acta[J],2016,624:47
4 Liu C T,Zhu J H,Brady M P et al.Intermetallics[J],2000,8:1119
5 Fujita M,Kaneno Y,Takasugi T.Journal of Alloys and Compounds[J],2006,424:283
6 Li K W,Wang T,Di C et al.Vacuum[J],2016,131:28
7 Aufrecht J,Leineweber A,Duppel V et al.Intermetallics[J],2011,19:1428
8 Xiao X,Lu S Q,Ma Y Q et al.Rare Metal Materials and Engineering[J],2008,37(1):119(in Chinese)
9 Kumar K S,Pang L,Horton J A et al.Intermetallics[J],2003,11:67710 Takasugi T,Kumar K S,Liu C T et al.Materials Science and Engineering A[J],1999,260:108
11 Bhowmik A,Pang H T,Edmonds I M et al.Intermetallics[J],2013,32:373
12 Ravichandran K S.Scripta Materialia[J],1996,34(12):1819
13 Bhowmik A,Bennett R J,Monserrat B et al.Intermetallics[J],2014,48:62
14 Xue Y L,Li S M,Li K W et al.Materials Chemistry and Physics[J],2015,167:119
15 Xiao X.Research on the in-Situ Synthesis and RoomTemperature Toughening of Laves Phase Cr2Nb Based Alloys[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2008(in Chinese)
16 Saber M,Kotan H,Koch C C et al.Materials Science and Engineering A[J],2012,556:664
17 Rupert T J.Current Opinion in Solid State and Materials Science[J],2016,20:257
18 Sun Y L,Xu S Q,Shan A D.Materials Science and Engineering A[J],2015,641:181
19 Radi Y,Mahmudi R.Materials Science and Engineering A[J],2010,527:2764
20 Yi J,Wang C X,Xia Y Y.Electrochemistry Communications[J],2013,33:115
21 Huang P Y.The Principle of Powder Metallurgy[M].Beijing:Metallurgical Industry Press,1997(in Chinese)
22 Taksugi T,Hanada S,Yoshida M.Materials Science and Engineering A[J],1995,192-193:805
23 Li K W,Li S M,Zhao S X et al.Acta Metallurgical Sinica(English Letters)[J],2013,26(6):687(in Chinese)
24 Kumar K S,Liu C T.Acta Materialia[J],1997,45(9):3671
25 Luzzi D E,Rao G,Dobbins T A et al.Acta Materialia[J],1998,46(8):2913
26 Kazantzis A V,Aindow M,Jones I P et al.Acta Materialia[J],2007,55:1873