不同初始态Mg-Zn-Gd加工过程中组织和性能的演变  

Microstructure and Mechanical Property Evolution of Mg-Zn-Gd Alloy with Different Initial States During Processing

作　　者：丁云鹏[1] 乐启炽[1] 张志强[1] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第9期1262-1265,共4页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2013CB632203);国家十二五科技支撑计划项目(2011BAE22B03;2011BAE22B04);辽宁省高等学校优秀人才支持计划项目(LJQ2012023);辽宁省自然科学基金资助项目(201202072)

摘　　要：主要研究了初始状态分别为轧态和退火态的Mg-2%Zn-1%Gd合金在360℃进行单道次66%大压下轧制和其后的退火加工过程中组织和性能的演变规律.通过金相观察、拉伸实验和杯突实验分析表明:不同初始状态Mg-Zn-Gd合金随着加工过程的进行其力学性能及演化规律也明显不同.这是由对应组织中的剪切带、孪生密度和晶粒尺寸共同决定的.初始退火态Mg-Zn-Gd合金经大压下轧制和热处理加工之后表现出了更优秀的机械性能和更小的各向异性,其最终伸长率可达28.9%.初始为退火态的MgZn-Gd合金板材最终制得的薄板在室温下的成形性更好.The as-rolled and as-annealed Mg-2% Zn-1% Gd sheets were processed by 66% rolling at 360 ℃and subsequent annealing. The microstructure and mechanical property evolution during processing were studied. The specimens were examined by optical microscopy, tensile test and Erichsen test. The results indicated that during processing, the mechanical property evolution of Mg-Zn-Gd sheets with different initial state is different, depending on shear band, twin density and grain size. After the whole thermal-mechanical processing, the as-annealed sheet with the elongation rate of 28.9% has a better mechanical property and a lower mechanical anisotropy, compared with those of the as-rolled sheet. The as-annealed sheets also exhibit better formability at room temperature.

关 键 词：镁合金 大压下 轧制 性能 微观组织 

分 类 号：TG335.58[金属学及工艺—金属压力加工]