GWN751K镁合金热压缩实验研究  

Hot compression deformation behavior of GWN751K magnesium alloy

作　　者：马鸣龙[1] 张奎[1] 李兴刚[1] 李永军[1] 王海珍[1] 何兰强[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《材料科学与工艺》2010年第6期868-872,共5页Materials Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2007CB613704;2007CB613705)

摘　　要：在Gleeble-1500D热模拟机上进行了单向热压缩试验,研究了GWN751K镁合金在变形温度为623-773K,应变速率为0.002-2s-1条件下热变形行为,变形量为60%.结果表明,在相同变形温度条件下,流变应力随变形速率的增加而上升,在相同的应变速率条件下,流变应力随着变形温度的升高而下降,计算出其平均激活能Q为228.61kJ/mol,应力指数n为4.2.根据材料动态模型,计算并分析了GWN751K合金的热加工图,并确定了合适的挤压加工条件为723K,0.01/s.通过对合金的挤压试验研究,验证了加工条件,挤压后的合金断裂强度为320MPa,延伸率为18%,较铸态合金有显著提高.The hot deformation behavior of GWN751K magnesium alloy was investigated by Gleeble-1500D hot simulator with reduction of 60% and strain rates of 0.002,0.02,0.2,2 s^-1 at 623-773 K.The results indicate that the flow stress is both influenced by temperatures and strain rates.At a given temperature,the flow stress is increased with increasing the strain rate;while with a given strain rate,it is decreased with increasing the temperatures.Average activation energy and stress exponent are 228.61kJ/mol and 4.2 respectively.The processing map is calculated and analyzed according to the dynamic materials model.From the the proper hot deformation temperature of 723 K and strain rate of 0.01 s-1 are obtained

关 键 词：稀土镁合金 流变应力 热变形 加工图 

分 类 号：TG386[金属学及工艺—金属压力加工]