Al含量对单晶TiAl合金力学性能的影响（英文）
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摘要
通过改变TiAl中Al的含量,用分子动力学方法研究了Al含量对含有裂纹的单晶TiAl试件性能及裂纹扩展的影响,分析了不同Al含量下的应力-应变曲线,缺陷的演化过程。模拟结果表明:Al含量不同,材料的弹性模量和强度也不同。Al含量低于45 at%时,由于层错和位错的产生以及位错反应和运动产生的空位和空位的迁移提高了试件的塑性使得试件表现出良好的塑性,而大于该含量时,试件呈明显的脆性;Al含量较低时,裂纹以塑性变形的方式扩展,Al含量较高时,裂纹以脆性方式断裂。即Al含量会影响材料的性能;随着Al含量降低,试件的塑性增强,此外,Al含量对裂纹的扩展机制也有很大影响。
The effects of Al content on the mechanical properties and the crack propagation mechanism of single crystal TiAl was discussed using molecular dynamics simulation. The stress-strain curves and evolution process of the defects were obtained under different Al contents. The results show that the Al content would affect the elastic modulus and the strength of the TiAl alloy. Defects such as stacking faults, dislocations and vacancies and their migrations result in better plasticity of TiAl when the Al content is below 45 at%. However, the specimen exhibits obvious brittleness with the Al content greater than 45 at%. Furthermore, the plasticity deformation dominates the main mode under the low Al content, while the crack fracture presents brittleness when the Al content is high. Therefore, Al contents would affect the mechanical proprieties of TiAl alloy, i.e. the plasticity of TiAl would increase with the decreasing Al content. In addition, the mechanism of crack propagation would vary with the change of Al content.
The effects of Al content on the mechanical properties and the crack propagation mechanism of single crystal TiAl was discussed using molecular dynamics simulation. The stress-strain curves and evolution process of the defects were obtained under different Al contents. The results show that the Al content would affect the elastic modulus and the strength of the TiAl alloy. Defects such as stacking faults, dislocations and vacancies and their migrations result in better plasticity of TiAl when the Al content is below 45 at%. However, the specimen exhibits obvious brittleness with the Al content greater than 45 at%. Furthermore, the plasticity deformation dominates the main mode under the low Al content, while the crack fracture presents brittleness when the Al content is high. Therefore, Al contents would affect the mechanical proprieties of TiAl alloy, i.e. the plasticity of TiAl would increase with the decreasing Al content. In addition, the mechanism of crack propagation would vary with the change of Al content.
引文
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39 Tetsui T,Kobayashi T,Harada H.Materials Science&Engineering A[J],2012,552:345
2 Marketz W T,Fischer F D,Clemens H.International Journal of Plasticity[J],2003,19(19):281
3 Clemens H,Smarsly W.Advanced Materials Research[J],2011,278:551
4 Kim Y W.Journal of the Minerals Metals&Materials Society[J],1995,47(7):39
5 Chen Y Y,Su Y J,Kong F T.Rare Metal Materials and Engineering[J],2014,43(3):757(in Chinese)
6 Hénaff G,Gloanec A L.Intermetallics[J],2005,13(5):543
7 Khan A N,Usman A.Journal of Alloys&Compounds[J],2010,491(1-2):209
8 Pen C Q,Huang B Y,He Y H.The Chinese Journal of Nonferrous Metals[J],2001,11(4):527(in Chinese)
9 Zheng R T,Zhang Y L,Chen Y C et al.Material Science&Technology[J],2004,12(3):225
10 Donachie M J.Titanium:A Technical Guide[M].USA:ASMInternational,1988
11 Qi H Q,Yang H M,Wang C Y et al.China Chemical Trade[J],2014(32):171(in Chinese)
12 Yang H M,Luo L S,Song M H et al.Materials Review[J],2012,26(S2):367(in Chinese)
13 Imayev R M,Imayev V M,Oehring M et al.Intermetallics[J],2007,15(4):451
14 Umeda H,Kishida K,Inui H et al.Materials Science and Engineering[J],1997,239-240:336
15 Lin X,Umakoshi Y.Materials Science&Engineering A[J],2003,339(1-2):63
16 Lin X.Materials Science&Engineering A[J],2005,394(1-2):168
17 Jung J Y,Park J K,Chun C H.Intermetallics[J],1999,7(9):1033
18 Li P,Yang Y Q,Zhang W et al.RSC Advances[J],2016,6(60):54 763
19 Zhang B.Thesis for Master[D].Changsha:Central South University,2012(in Chinese)
20 Zope R R,Mishin Y.Physical Review B[J],2003,68(2):024 102
21 Xu D S,Wang H,Yang R et al.Acta Materialia[J],2008,56(5):1065
22 Zhao W J,Xu D S,Zhao J W et al.Transactions of Nonferrous Metals Society of China[J],2014,24(11):3645
23 Wu H N,Xu D S,Wang H et al.Journal of Materials Science&Technology[J],2016,32(10):1033
24 Tang F L,Cai H M,Bao H W et al.Computational Materials Science[J],2014,84:232
25 Song H Y,Li Y L.Physics Letters A[J],2012,376(4):529
26 Sainath G,Choudhary B K.Physics Letters A[J],2015,379(34-35):1902
27 Guo X,Xia Y Z.Acta Materialia[J],2011,59(6):2350
28 Mine Y,Takashima K,Bowen P.Materials Science&Engineering A[J],2012,532:13
29 Tetsui T,Shindo K,Kobayashi S et al.Intermetallics[J],2003,11(4):299
30 Tetsui T,Shindo K,Kobayashi S et al.Scripta Materialia[J],2002,47(6):399
31 Han C S.Korean Journal of Materials Research[J],2015,25(8):398
32 Liu H W,Li Z X,Gao F et al.Journal of Alloys&Compounds[J],2017,698:898
33 Zhang W J,Deevi S C,Chen G L.Intermetallics[J],2002,10(5):403
34 Zhang W J,Appel F.Materials Science&Engineering A[J],2002,329-331:649
35 Xu D S,Wang H,Yang R et al.IOP Conference Series:Materials Science and Engineering[J],2009,3:012 024
36 Sun L G,He X Q,Wang J B et al.Materials Science and Engineering A[J],2014,606:334
37 Inui H,Yamaguchi M.Properties of Complex Inorganic Solids[M].Boston:Springer,1997
38 El-Chaikh A,Heckel T K,Christ H J.International Journal of Fatigue[J],2013,53:26
39 Tetsui T,Kobayashi T,Harada H.Materials Science&Engineering A[J],2012,552:345