镁合金塑性变形过程中锯齿屈服现象的研究进展<br />-中国材料进展

文章信息/Info

Title:: Research Progress on the Plastic Instability Phenomenon of Magnesium Alloys

作者:: 李传强; 许道奎; 韩恩厚; (1. 东北大学材料科学与工程学院，辽宁沈阳 110819)
(2. 中国科学院金属研究所材料环境腐蚀研究中心，辽宁沈阳 110016)

Author(s):: LI Chuanqiang1; 2; XU Daokui2; HAN Enhou2; (1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China)
(2. Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)

摘要:: 在所有工程用金属结构材料中，镁合金的密度最低，具有较高的比强度和比刚度。然而，镁合金在一定的塑性变形条件下会出现明显的“塑性不稳定”现象，也被称作锯齿屈服（流变）现象或Portevin-Le Chatelier(PLC)效应，主要表现为应力-应变曲线上的锯齿状波动。近年来，关于镁合金PLC效应的研究报道逐年增加。本文将重点介绍镁合金中存在塑性不稳定现象相关的研究进展，叙述并归纳镁合金PLC效应发生的条件、锯齿屈服的特征、合金元素对锯齿屈服现象的影响及对应的理论机制等。最后，指出目前研究中尚存在的问题，提出将来的研究重点和发展方向。

Abstract:: Among all the structural metallic materials, magnesium alloys have the lowest density, higher specific strength and modulus. However, under plastic deformation conditions, magnesium alloys can exhibit the phenomenon of plastic instability, serrated flow or Portevin-Le Chatelier (PLC) effect, i.e. showing serrated waves on the stress-strain curves. Recently, research works about the PLC effects of magnesium alloys are widely carried out and increases annually. This paper is mainly concentrated on the research progress on PLC effect of magnesium alloys. The occurring conditions, characteristics of serration, effect of alloying elements on the PLC effect and relevant mechanisms are reviewed. Finally, the existing problems in current studies, research emphasis and direction in the future are also pointed out.