镁合金塑性机制研究综述

Plastic Deformation Mechanisms in Magnesium Alloys:A Review

纯镁具有丰富的微观塑性机制,尤其是孪晶,导致其塑性变形错综复杂,力学性能也与常见的面心及体心立方金属有显著差异.由于现今学界对位错滑移与孪晶变形等塑性机制缺乏充分认识,镁合金性能调控效果尚不理想,与铝合金相比,镁合金的力学性能还有很大的提升空间.基于此背景,论文首先回顾了镁合金的发展历史与应用现状.然后介绍了镁中位错滑移与孪晶变形等塑性机制的研究进展,重点阐述<c+a>位错、孪晶、晶界、析出相、溶质原子等重要的微结构,并简要介绍了计算机模拟方法.最后展望了强韧性能方面值得重视的若干研究方向.

Pure magnesium has various microscopic plastic modes,especially twinning,which lead to a complex plastic deformation.The mechanical properties also show significant difference from those of the common FCC and BCC metals.However,due to the lack of sufficient understanding on the plastic mechanisms in dislocation slip and twinning deformation,the mechanical properties of magnesium alloys were not improved well.Compared with aluminum alloys,the mechanical properties of magnesium alloys still have much room for improvement.Based on this background,I first reviewed the development history and application status of magnesium alloys.Then I introduced the research progress in plastic mechanisms of dislocation slip and twinning deformation as well as computer simulation methods.Especially<c+a>dislocations,twinning,grain boundaries,precipitates,and solute atoms were highlighted.Finally,some research topics worthy of attention were proposed.