(1.北京工业大学材料与制造学部，北京 100124；
2. 郑州轻研合金科技有限公司，郑州 450041)
摘 要: 本文以Mg-xZn-0.5Er(x=0.5,2.0,3.0,4.0，质量分数，%)合金板材为研究对象，考察退火前/后织构及第二相变化对组织和性能的影响。结果表明：粗大第二相可促进动态再结晶(DRX)的发生，细化变形组织；同时，粗大第二相也可促进静态再结晶(SRX)的发生，进一步细化组织、弱化织构，但板材强度降低；退火后，合金板材室温杯突值(IE)普遍降低，且其大小与第二相含量呈负相关；而退火中产生的纳米第二相则进一步减弱了板材的室温成形能力，这说明第二相抵消或削弱了织构优化对成形能力的提升作用。第二相是影响Mg-xZn-0.5Er合金板材室温成形能力的关键性因素。
关键字: Mg-Zn-Er合金；再结晶；第二相；力学性能；成形性能
（1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;
2. Zhengzhou Light Alloy Institute Co., Ltd., Zhengzhou 450041, China）
Abstract:The magnesium alloy sheet has a great industrial application value, but the further application has been restricted because of its inferior formability. Aim to this problem, the Mg-xZn-0.5Er alloy sheets were produced and investigated in the present investigation. The effects of texture/second phase transformation after annealing treatment on microstructure and properties were studied. The results show that the coarse second phase promotes the occurrence of dynamic recrystallization (DRX), resulting in refinement of deformed microstructure. Also, this coarse phase also activates the static recrystallization (SRX), and both the microstructure and the texture are further modified, but the strengths of these sheets are reduced. Moreover, the Index Erichsen (IE) values of these as-annealing sheets generally decrease at room temperature. These IE values are negatively correlated with the content of second phase, and the presence of nano-scale second phase further make IE values get worse at room temperature. It is indicated that the second phase plays an important role in subduction of formability improvement by texture modifying. These second phase is the critical factor to determine the formability of these sheets at room temperature.
Key words: Mg-Zn-Er alloy; recrystallization; secondary phase; mechanical property; formability
