|
OALib Journal期刊
ISSN: 2333-9721
费用：99美元
|
|
|
|
纳米压痕形变过程的分子动力学模拟
, PP. 1238-1242
Keywords: 纳米压痕,分子动力学模拟,位错发射
Abstract:
根据EAM多体势,利用分子动力学方法模拟了Ni压头压入Al基体的纳米压痕全过程.包括压头接近和离开基体时的原子组态;压入和上升时的载荷-位移曲线以及位错的发射和形变带的产生和变化;同时模拟了纳米尺度的应力弛豫行为.结果表明,当压头尚未接触基体时就能吸引基体原子，通过缩颈而互相连接.当压入应力τs为1.9MPa时，基体Al开始发射位错;当分切应力τd=6.4MPa时，出现形变带.压头上升过程出现反向的拉应力，使基体反向屈服，在卸载过程中基体残留位错的组态不断改变.当压头上升离开基体后能拉着基体通过缩颈而相连，当压头和基体分离后仍粘有基体原子.在纳米尺度也存在应力弛豫现象，其原因是热激活引起的位错发射和运动.
| [1] | Field J S, Swain M V. J Mater Res, 1993; 8: 297
|
| [2] | Oliver W C, Pharr G M. J Mater Res, 1992; 7: 1564
|
| [3] | Bahr D F, Kramer D E, Gerberich W W. Ada Mater,1998; 46: 3605
|
| [4] | Pang M, Eakins D E, Norton M G, Bahr D F. Corrosion,2001; 57: 523
|
| [5] | Doerner M F, Gardner D S, Nix W D. J Mater Res, 1986;1: 845
|
| [6] | Bahr D F, Nelson J C, Tymiak N, Gerberich W W.JMater Res, 1997; 12: 3345
|
| [7] | Yao Y, Qiao L J, Sun D B, Chu W Y. Acta Metall Sin, 2003; 39: 855 (姚远,乔利杰,孙冬柏,褚武扬.金属学报,2003;39:855)
|
| [8] | Hoagland R G, Daw M D, Hirth J P. J Mater Res, 1991;6: 2565
|
| [9] | Li Q K, Zhang Y, Shi S Q, Chu W Y. Mater Lett, 2002; 56: 927
|
| [10] | Landman U, Luedtke W D, Burnham N A, Colton R J. Science, 1990; 248: 454
|
| [11] | Rafii-Tabar H. Phys Rep, 2000; 325: 240
|
| [12] | Yu H L, Adams J B, Hector L G. Modell Simul Mater Sci Eng, 2002; 10: 239
|
| [13] | Christopher D, Smith R, Richter A. Nucl lnstrum Methods Phys Res, 2001;180:117
|
| [14] | Chen S P, Voter A F, Albers R C. J Mater Res, 1990; 5: 955
|
| [15] | Toxvaerd S. J Comput Phys, 1982; 47:444
|
| [16] | Calm R W, Haasen P. Physical Metallurgy. 3rd ed., Amsterdam: North-Holland, 1983: 1301
|
| [17] | Ma Q, Clarke D R. J Mater Res, 1995; 10: 853
|
| [18] | McElhaney K W, Vlassak J J, Nix W D. J Mater Res, 1998;13:1300
|
| [19] | Fleck N A, Hutchinson J W. J Mech Phys Solids, 1993; 41: 1825
|
| [20] | Wang W, Jiang C B, Lu K. Acta Mater, 2003; 51: 6169L
|
Full-Text
|
|
Contact Us
service@oalib.com QQ:3279437679 
WhatsApp +8615387084133
|
|
