Grain size dependence of the yield stress for metals at quasistatic and dynamic loadings

摘要：

　　Micro mechanisms of plastic deformation and the defect structure evolution are sufficiently changing with the strain rate increase. It leads to non-monotonic relations between the macroscopic characteristics of metal strength or ductility and the structure parameters such as a grain size. Our simulations predict an inverse Hall-Petch relation for ultrafine-grained metals at extremely high strain rate (above 107s-1). Mechanisms of the homogeneous nucleation of dislocations and the mechanical twining can effectively decrease the stresses at strain rates up to 109s-1.

关键词： High strain rates plasticity Ultrafine-grained materials Inverse Hall-Petch relation Grain boundary sliding

作者: Elijah N.Borodin Alexander E.Mayer Polina N.Mayer

作者单位: Institute of Problems of Mechanical Engineering RAS,199178,Russia;Department of Physics,Chelyabinsk Department of Physics,Chelyabinsk State University,454001,Russia

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-9

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）