Constitutive Relation of Martensitic Transformation in CuAINi Based on Atomistic Simulations

摘要：

　　In this work,atomistic simulations on martensitic transformation in CuAlNi are carried out with a second nearest-neighbor modified embedded atomic method (2NN MEAM).The discontinuous deformation gradients in the twinned martensite are calculated based on the rank-one connection and least square analysis.Due to the shear/shuffle of 110 <110>,the resultant atomistic transformation strain field shows very fine patterns and is identified as large deformation.The associated Cauchy stress field is calculated using atomistic virial stress from molecular dynamics.Shear components of stress and strain along the martensite twin boundary are retrieved from the thermoelastic MT cycle.Based on temporal and spatial averaging,statistics of shear stress and strain gives a pseudo-elastic micro-scale constitutive relation with a hysteresis for martensitic transformation in CuAlNi.The nonlinear relation obtained can be used to study the transformation dynamics in the continuum scale.

作者: Y.ZHEN Z.LI

作者单位: School of Astronautics, Harbin Institute of Technology, Mailbox 344, 92 West Dazhi Street, Harbin 150001, Peoples Republic of China

会议类型: 国际会议

会议名称: Sixth International Conference on Nonlinear Mechanics(第六届国际非线性力学会议)(ICNM-VI)

会议地点: 上海

会议语种:英文

页码: 49-52

在线出版日期: 2013-08-01（万方平台首次上网日期，不代表论文的发表时间）