晶界对纳米多晶铝中冲击波阵面结构影响的分子动力学研究

马文; 祝文军; 陈开果; 经福谦

doi:10.7498/aps.60.016107

摘要

用分子动力学方法研究了纳米多晶铝在冲击加载下的冲击波阵面结构及塑性变形机理.模拟研究结果表明:在弹性先驱波之后,是晶界间滑移和变形主导了前期的塑性变形机理;然后是不全位错在界面上成核和向晶粒内传播,然后在晶粒内形成堆垛层错、孪晶和全位错的过程主导了后期的塑性变形机理.冲击波阵面扫过之后留下的结构特征是堆垛层错和孪晶留在晶粒内,大部分全位错则湮灭于对面晶界.这个由两阶段塑性变形过程导致的时序性塑性波阵面结构是过去未见报道过的.

关键词:

Abstract

The shock front structure and the plastic deformation of nanocrystalline aluminum under shock loading are investigated by using molecular dynamics simulations. The simulation results show that: after the elastic wave was generated, the grain boundary sliding and deformation dominated the early plastic deformation mechanisms, then the partial dislocations were nucleated at the deformed grain boundaries and spread within the grains, finally the process of stacking faults, deformation twins and full dislocation formation in the grain dominated the latter stage of the plastic deformation. The structural characteristics after the shock front swept over is that the stacking faults and the deformation twins are left in grains, and the majority of the full dislocations are annihilated at the opposite grain boundaries. It is reported for the first time that the shock front structure reflects the time sequence of two different plastic deformation mechanisms in nanocrystalline aluminum.

Keywords:

作者及机构信息

(1)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理国防科技重点实验室,绵阳 621900; (2)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理国防科技重点实验室,绵阳 621900;国防科学技术大学物理系,长沙 410073

基金项目: 冲击波物理与爆轰物理国防科技重点实验室基金(批准号:9140C6703010804,9140C6701010902),中国工程物理研究院科学技术发展基金重点项目(批准号:2007A01004)资助的课题.

Authors and contacts

(1)National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China; (2)National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China;Department of Physics, National University of Defense Technology, Changsha 410073, China

参考文献

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施引文献

[1]	Zhakhovskii V V, Zybin S V, Nishihara K, Anisimov S I 1999 Phys. Rev. Lett. 83 1175
[2]	Jones O E, Holland J R 1968 Acta Metall. 16 1037
[3]	Chhabildas L C, Asay J R 1979 J. Appl. Phys. 50 2749
[4]	Gahagan K T, Moore D S, Funk D J, Rabie R L, Buelow S J, Nicholson J W 2000 Phys. Rev. Lett. 85 3205
[5]	Holian B L 2003 High-Pressure Shock Compression of Solids VI edited by Horie Y, L Davison, and N N Thadhani (New York: Springer)
[6]	Meyers M A 1977 Mater. Sci. Eng. 30 13
[7]	Meyers M A, Carvalho M S 1976 Mater. Sci. Eng. 24 5
[8]	Barber J L, Kadau K 2008 Phys. Rev. B 77 144106
[9]	Germann T C, Holian B L, Lomdahl P S, Ravelo R 2000 Phys. Rev. Lett. 84 4
[10]	Holian B L, Lomdahl P S 1998 Science 280 4
[11]	Cao B, Bringa E M, Meyers M A 2007 Metall. Mater. Trans. A 38 2681
[12]	Weertman J R 2002 Nanostructured Materials: Processing, Properties, and Potential Applications edited by Koch C C (New York: William Andrew Publishing)
[13]	Dao M, Lu L, Asaro R J, Hosson J T M D, Ma E 2007 Acta Mater. 55 25
[14]	Meyers M A, Mishra A, Benson D J 2006 Prog. Mater. Sci. 51 427
[15]	Kumar K S, Van Swygenhoven H, Suresh S 2003 Acta Mater. 51 5743
[16]	Bringa E M, Caro A, Wang Y M, Victoria M, McNaney J M, Remington B A, Smith R F, Torralva B R, Van Swygenhoven H 2005 Science 309 1838
[17]	Kadau K, Germann T C, Lomdahl P S, Albers R C, Wark J S, Higginbotham A, Holian B L 2007 Phys. Rev. Lett. 98 135701
[18]	Jarmakani H N, Bringa E M, Erhart P, Remington B A, Wang Y M, Vo N Q, Meyers M A 2008 Acta Mater. 56 5584
[19]	Bringa E M, Caro A, Victoria M, Park N 2005 JOM 57 67
[20]	Chen D 1995 Comput. Mater. Sci. 3 327
[21]	Ma W, Zhu W J, Zhang Y L, Chen K G, Jing F Q, 2010 Acta Phys. Sin. 59 4781 (in Chinese)[马文、祝文军、张亚林、陈开果、邓小良、经福谦 2010 物理学报 59 4781]
[22]	Mishin Y, Parkas D, Mehl M J, Papaconstantopoulos D 1999 Mater. Res. Soc. Symp. Proc. 538 535
[23]	Wang H Y, Zhu W J, Song Z F, Liu S J, Chen X R, He H L 2008 Acta Phys. Sin. 57 3703(in Chinese)[王海燕、祝文军、宋振飞、刘绍军、陈向荣、贺红亮 2008 物理学报 57 3703]
[24]	Wang H Y, Zhu W J, Deng X L, Song Z F, Chen X R 2009 Acta Phys. Sin. 58 1154(in Chinese)[王海燕, 祝文军, 邓小良, 宋振飞, 陈向荣 2009 物理学报 58 1154]
[25]	Honeycutt J D, Andersen H C 1987 J. Phys. Chem. 91 4950
[26]	Cormier J, Rickman J M, Delph T J 2001 J. Appl. Phys. 89 99
[27]	Deng X L, Zhu W J, He H L, Wu D X, Jing F Q 2006 Acta Phys. Sin. 55 4767(in Chinese)[邓小良、祝文军、贺红亮、伍登学、经福谦 2006 物理学报 55 4767]
[28]	Jing F Q 1999 Introduction to Experimental Equation of States (ed. 2) (Beijing: Science Press) p91(in Chinese) [经福谦 1999 实验物态方程导引(第二版) (北京: 科学出版社) 第91页]
[29]	Marsh P S 1980 LASL Shock Hugoniot Data (Berkeley: University of California Press)
[30]	Frseth A G, Derlet P M, Van Swygenhoven H 2004 Appl. Phys. Lett. 85 5863
[31]	Cheung K S, Yip S 1991 J. Appl. Phys. 70 5688
[32]	Zimmerman J A, Webb III E B, Hoyt J J, Jones R E, Klein P A, Bammann D J 2004 Modell. Simul. Mater. Sci. Eng. 12 S319
[33]	Van Swygenhoven H 2002 Science 296 66
[34]	Van Swygenhoven H, Derlet P M, Hasnaoui A 2002 Phys. Rev. B 66 024101

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