综合考虑尺寸和应变速率的单晶Ni_(3)Al屈服强度的理论模型  

Theoretical model for yield strength of monocrystalline Ni_(3)Al by simultaneously considering size and strain rate

作　　者：张志伟 蔡微[3] 王军[1] 杨荣[1] 肖攀 柯孚久[3] 卢春生 Zhi-wei ZHANG;Wei CAI;Jun WANG;Rong YANG;Pan XIAO;Fu-jiu KE;Chun-sheng LU(State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics,Beihang University,Beijing 100191,China;School of Civil and Mechanical Engineering,Curtin University,Perth,WA 6845,Australia)

机构地区：[1]中国科学院力学研究所非线性力学国家重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]北京航空航天大学物理学院,北京100191 [4]School of Civil and Mechanical Engineering,Curtin University,Perth,WA 6845,Australia

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第3期816-823,共8页中国有色金属学报（英文版）

基　　金：the financial supports from the National Natural Science Foundation of China(Nos.11772332,11790292,11727803,11988102);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB22040501);the Opening Fund of State Key Laboratory of Nonlinear Mechanics,China。

摘　　要：为了综合考虑尺寸和应变率效应对单晶延性材料屈服强度的影响,建立基于位错形核机制的理论模型。以Ni_(3)Al为例,首先,通过分子动力学模拟结果拟合出材料参数;然后,通过材料参数构建屈服强度的理论曲面;最后,用现有实验数据检验该理论模型。通过现有第三方单晶铜和金的分子动力学和实验数据对该模型进行检验。结果表明,该模型可以跨越分子动力学和实验条件之间巨大的空间和时间差异,从而得到单晶Ni_(3)Al、铜和金的可靠力学性能。To comprehensively describe the size and strain rate dependent yield strength of monocrystalline ductile materials,a theoretical model was established based on the dislocation nucleation mechanism.Taking Ni_(3)Al as an example,the model firstly fits results of molecular dynamics simulations to extract material dependent parameters.Then,a theoretical surface of yield strength is constructed,which is finally verified by available experimental data.The model is further checked by available third part molecular dynamics and experimental data of monocrystalline copper and gold.It is shown that this model can successfully leap over the huge spatial and temporal scale gaps between molecular dynamics and experimental conditions to get the reliable mechanical properties of monocrystalline Ni_(3)Al,copper and gold.

关 键 词：屈服强度 尺寸 应变速率 单晶Ni_(3)Al 

分 类 号：TG146.15[一般工业技术—材料科学与工程]