Yielding of magnesium: From single crystal to polycrystalline aggregates

被引：241

作者：

Graff, Stephane ^{[1
]}

Brocks, Wolfgang ^{[1
]}

Steglich, Dirk ^{[1
]}

机构：

[1] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2007年 / 23卷 / 12期

关键词：

hcp; magnesium; crystal plasticity; slip systems; twinning; yield surface;

D O I：

10.1016/j.ijplas.2007.07.009

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Hexagonal close-packed (hcp) metals show a deformation behavior, which is quite different from that of materials with cubic crystalline structure. As a consequence, rolled or extruded products of magnesium and its alloys exhibit a strong anisotropy and an unlike yielding in tension and compression. In this work, the microstructural mechanisms of deformation in pure magnesium are modeled by visco-plastic constitutive equations of crystal plasticity. Single crystals and textured polycrystals are analyzed numerically. By means of virtual mechanical tests of representative volume elements mesoscopic yield surfaces are generated. The linking of micro- and mesoscale provides a procedure for the simulation of the yielding and hardening behavior of arbitrarily textured solids with hcp structure such as extruded bars or rolled plates. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1957 / 1978

页数：22