夏祥生,李兴刚,马鸣龙,李永军,黄未华,邓霞,张奎

• 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

摘要(Abstract)：

采用Gleeble-1500热模拟机研究粗晶Mg-6.8Gd-4.5Y-1.1Nd-0.5Zr镁合金在温度为623～803 K、应变速率为0.005～5 s-1条件下的高温变形行为。结果表明:流动应力随变形温度的降低或应变速率的升高而增加,在高温变形初始阶段,流动应力随应变的增加迅速增加,当应变超过一定值后,流变应力开始下降并逐渐趋于稳定,出现稳态流动特征;基于Arrhenius方程建立Mg-6.8Gd-4.5Y-1.1Nd-0.5Zr合金高温流变应力本构模型;在723 K、应变速率0.05 s-1条件下,显微组织出现大晶粒被细小晶粒包围的"项链"组织特征,局部晶粒交结处出现微裂纹与孔洞;根据实验结果,合金的热加工宜在773 K左右进行。

关键词(KeyWords)： 镁合金;高温变形行为;变形激活能;本构模型

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”课题支撑计划(2011BAE22B01)

作者(Author): 夏祥生,李兴刚,马鸣龙,李永军,黄未华,邓霞,张奎

DOI: 10.13289/j.issn.1009-6264.2012.09.018

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