A model for microstructure evolution in adiabatic shear bands

被引：0
|
作者：
Joy A. Hines
Kenneth S. Vecchio
Said Ahzi
机构：
[1] Technical University Hamburg-Harburg,Department of Metallurgy and Materials Technology
[2] University of California,the Department of Applied Mechanics and Engineering Sciences
[3] Clemson University,the Department of Mechanical Engineering
来源：
Metallurgical and Materials Transactions A | 1998年 / 29卷
关键词：
Material Transaction; Dislocation Density; Shear Band; Tantalum; Slip System;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A mechanical subgrain rotation model is proposed to account for the recrystallized grains which have been observed to form in adiabatic shear bands in a number of materials. The model is based on a “bicrystal” approach using crystal plasticity theory to predict the evolution of subgrain misorientations. These mechanically induced rotations are shown to occur at the high strain rate associated with adiabatic shear band formation. Recrystallized grain formation is proposed to occur by the formation and mechanical rotation of subgrains during deformation, coupled with boundary refinement via diffusion during shear band cooling. This model is referred to as progressive subgrain misorientation recrystallization and appears to account for shear band microstructures in a variety of metals.
引用
收藏
页码：191 / 203
页数：12
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