High temperature tensile deformation behavior of AZ80 magnesium alloy  

AZ80镁合金的高温拉伸变形行为(英文)

作　　者：乔军[1] 边福勃[1] 何敏[1] 王瑜[1] 

机构地区：[1]辽宁科技大学材料与冶金学院,鞍山114051

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期2857-2862,共6页中国有色金属学报（英文版）

基　　金：Project(50801034)supported by the National Natural Science Foundation of China;Project(LJQ 2011026)supported by Development Foundation for Excellent Young Scholars in Universities of Liaoning Province,China;Project(2006207)supported by Foundation for "Ten-Hundred-Thousand" High-end Talent Introduction Project in Liaoning Province,China

摘　　要：Tensile behaviors of an AZS0 alloy were investigated by elongation-to-failure tensile tests at 300, 350, 400 and 450 ℃, and strain rates of 10-2 and 10-3 s 1. Strain-rate-change tests from 5×10-5 s-1 to 2x10-2 s-1 were applied to study deformation mechanisms. The experimental data show that the material exhibits enhanced tensile ductilities of over 100% at 400 and 450 ℃ with stress exponent of 4.29 and activation energy of 149.60 kJ/mol, and initial fine grains preserve in evenly deformed gauge based on microstructure studies. The enhanced tensile ductilities are rate controlled by a competitive mechanism of grain boundary sliding and dislocation climb creep, based on which a model can successfully simulate the deformation behavior.采用拉伸至断裂实验,在温度为300、350、400和450°C,应变率分别为10-2和10-3s-1条件下,研究AZ80镁合金的拉伸行为。并采用变化应变率拉伸实验在5×10-5至2×10-2s-1的应变率范围内进行变形机制研究。结果表明:该材料在400和450°C下具有超过100%的高伸长率,其应力指数为4.29,变形激活能为149.60 kJ/mol。初始细晶粒在均匀变形区的高温变形中较为稳定,其变形机制为晶界滑移和位错攀移蠕变的竞争机制。基于该机制所建立的数学模型的模拟结果与实验数据吻合。

关 键 词：AZ80 magnesium alloy tensile behavior SUPERPLASTICITY CREEP stress exponent 

分 类 号：TG146.22[一般工业技术—材料科学与工程]