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使用分子动力学方法,模拟研究了单晶Cu(001)薄膜在双向等轴拉伸应变下的塑性变形行为.当应变超过一定值时,样品通过产生位错、层错及孪晶而发生塑性变形.当应变相对较低时,不全位错首先在薄膜表面形核并在密排面上滑移,留下堆积层错;当应变增加时,位错在表面与内部同时成核生长,层错数量也随之增加.分析了相邻滑移面上的位错之间相互作用形成孪晶的微观过程.材料内部形成大量堆积层错及孪晶后,较大孪晶的密排面上的原子也会发生滑移,形成孪晶内部的层错结构以释放残余应力.
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关键词:
- 分子动力学 /
- Shockley不全位错 /
- 孪晶
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[2] Wang Y M, Ma E 2004 Appl. Phys. Lett. 85 2750
[3] Lu L, Chen X, Huang X, Lu K 2009 Science 323 607
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[19] Chen K G, Zhu W J, Ma W, Deng X L, He H L, Jing F Q 2010 Acta Phys. Sin. 59 1225 (in Chinese)[陈开果、祝文军、马 文、邓小良、贺红亮、经福谦 2010 物理学报 59 1225]
[20] Kolluri K, Gungor M R, Maroudas D 2008 J. Appl. Phys. 103 123517
[21] Kolluri K, Gungor M R, Maroudas D 2008 Phys. Rev. B 78 195408
[22] Mei J, Davenport J W, Fernando G W 1991 Phys. Rev. B 43 4653
[23] Hoffmann K H 1996 Computational Physics (Berlin, Heidelberg: Springer-Verlag) p268
[24] Kelchner C L, Plimpton S J, Hamilton J C 1998 Phys. Rev. B 58 11085
[25] Tanguy D, Mareschal M, Lomdahl P S, Germann T C, Holian B, Ravelo R 2003 Phys. Rev. B 68 144111
-
[1] McFadden S X, Mishra R S, Valiev R Z, Zhilyaev A P, Mukherjee A K 1999 Nature 398 684
[2] Wang Y M, Ma E 2004 Appl. Phys. Lett. 85 2750
[3] Lu L, Chen X, Huang X, Lu K 2009 Science 323 607
[4] Zhang X, Wang H, Scattergood R O, Narayan J, Koch C C, Sergueeva A V, Mukherjee A K 2002 Appl. Phys. Lett. 81 823
[5] Wang Y M, Chen M W, Zhou F H, Ma E 2002 Nature 419 912
[6] Schitz J, Ditolla F D, Jacobsen K W 1998 Nature 391 561
[7] Kumar K S, Suresh S, Chisholm M F, Horton J A, Wang P 2003 Acta Mater. 51 387
[8] Swygenhoven H V 2002 Science 296 66
[9] Chen M W, Ma E, Hemker K J, Sheng H W, Wang Y M, Cheng X M 2003 Science 300 1275
[10] Abraham F F 2003 Adv. Phys. 52 727
[11] Bulatov V, Abraham F F, Kubin L, Devincre B, Yip S 1998 Nature 391 669
[12] Gungor M R, Maroudas D 2005 Appl. Phys. Lett. 87 171913
[13] He A M, Shao J L, Qin C S, Wang P 2009 Acta Phys. Sin. 58 5667 (in Chinese)[何安民、邵建立、秦承森、王 裴 2009 物理学报 58 5667]
[14] Kolluri K, Gungor M R, Maroudas D 2009 Appl. Phys. Lett. 94 101911
[15] Liu X M, You X C, Liu Z L, Nie J F, Zhuang Z 2009 J. Phys. D 42 035407
[16] Liu X M, You X C, Liu Z L, Nie J F, Zhuang Z 2009 Acta Phys. Sin. 58 1849 (in Chinese)[刘小明、由小川、柳占立、聂君峰、庄 茁 2009 物理学报 58 1849]
[17] Xu Z H, Yuan L, Shan D B, Guo B 2009 Acta Phys. Sin. 58 4835 (in Chinese) [徐振海、袁 琳、单德彬、郭 斌 2009 物理学报 58 4835]
[18] Liu Y L,Zhao X, Zhang Z N, Zhang L, Wang S Q, Ye H Q 2009 Acta Phys. Sin. 58 S246 (in Chinese)[刘永利、赵 星、张宗宁、张 林、王绍青、叶恒强 2009 物理学报 58 S246]
[19] Chen K G, Zhu W J, Ma W, Deng X L, He H L, Jing F Q 2010 Acta Phys. Sin. 59 1225 (in Chinese)[陈开果、祝文军、马 文、邓小良、贺红亮、经福谦 2010 物理学报 59 1225]
[20] Kolluri K, Gungor M R, Maroudas D 2008 J. Appl. Phys. 103 123517
[21] Kolluri K, Gungor M R, Maroudas D 2008 Phys. Rev. B 78 195408
[22] Mei J, Davenport J W, Fernando G W 1991 Phys. Rev. B 43 4653
[23] Hoffmann K H 1996 Computational Physics (Berlin, Heidelberg: Springer-Verlag) p268
[24] Kelchner C L, Plimpton S J, Hamilton J C 1998 Phys. Rev. B 58 11085
[25] Tanguy D, Mareschal M, Lomdahl P S, Germann T C, Holian B, Ravelo R 2003 Phys. Rev. B 68 144111
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