(1.北京工業(yè)大學(xué)材料與制造學(xué)部，北京 100124；
2. 鄭州輕研合金科技有限公司，鄭州 450041)
摘 要: 本文以Mg-xZn-0.5Er(x=0.5,2.0,3.0,4.0，質(zhì)量分?jǐn)?shù)，%)合金板材為研究對(duì)象，考察退火前/后織構(gòu)及第二相變化對(duì)組織和性能的影響。結(jié)果表明：粗大第二相可促進(jìn)動(dòng)態(tài)再結(jié)晶(DRX)的發(fā)生，細(xì)化變形組織；同時(shí)，粗大第二相也可促進(jìn)靜態(tài)再結(jié)晶(SRX)的發(fā)生，進(jìn)一步細(xì)化組織、弱化織構(gòu)，但板材強(qiáng)度降低；退火后，合金板材室溫杯突值(IE)普遍降低，且其大小與第二相含量呈負(fù)相關(guān)；而退火中產(chǎn)生的納米第二相則進(jìn)一步減弱了板材的室溫成形能力，這說(shuō)明第二相抵消或削弱了織構(gòu)優(yōu)化對(duì)成形能力的提升作用。第二相是影響Mg-xZn-0.5Er合金板材室溫成形能力的關(guān)鍵性因素。
關(guān)鍵字: Mg-Zn-Er合金；再結(jié)晶；第二相；力學(xué)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
