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总览 评价 赖欣 , 刘立胜 * ( 武汉理工大学工程力学系; ) 摘要: 本文采用分子动力学方法选用几种不同的势函数考察了Al单晶在两种温度下的弹性常数和两个晶面的表面能。计算结果显示出Morse势不适合于带有孔洞和缺陷的力学性能模拟,Voter和Chen提出的EA
赖欣, 刘立胜*
(
武汉理工大学工程力学系; )
摘要:
本文采用分子动力学方法选用几种不同的势函数考察了Al单晶在两种温度下的弹性常数和两个晶面的表面能。
计算结果显示出Morse势不适合于带有孔洞和缺陷的力学性能模拟,Voter和Chen提出的EAM势在0K温度下与理论值相符,300K温度下下降明显。Mishin提出的EAM势能够很好的模拟0K到300K温度下力学性能和表面能。
关键词:
分子动力学;表面能;弹性常数
Lai Xin, Liu Lisheng*
(
Department of Engineering Structure and Mechanics and Wuhan University of Technology; )
Abstract:
Molecular dynamics (MD) simulations in monocrystalline Aluminum are performed to calculate elastic constants and surface energy based on various potential functions. The results showed the Morse potentials are not inappropriate to the simulations of materials with defects or dislocations, while EAM potential proposed by Voter and Chen showed a reasonable agreement with theory and experiment at 0K. EAM potential proposed recently by Mishin et al showed good agreements with experiment with both elastic constants and surface energy at 0K and 300K.
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