朱利敏,李全安,张清,张兴渊

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心

摘要(Abstract)：

采用铸造的方法制备了Mg-5Gd-3Sm-0.5Zr耐热镁合金,对实验材料进行固溶时效处理,在应变速率0.002~0.1 s~(-1)、变形温度350~500℃、最大变形量70%条件下,利用Gleeble-1500热模拟试验机进行热压缩变形实验,分析材料在不同变形条件下的真应力真应变曲线及组织变化。结果表明:在恒应变速率下热变形,真应力水平随温度升高而降低;在相同温度下进行压缩变形,实验合金的真应力随应变速率的增加而提高;实验合金适合热加工的温度在400℃以上;对数据进行处理,得到了实验材料的热变形激活能Q=222.433 k J/mol,本构方程为ε=1.70×1014[sinh(0.015σ)]3.77exp[-222433/(8.314T)]。

关键词(KeyWords)： 耐热镁合金;变形激活能;热压缩变形;显微组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51171059;51571084;U1404501);; 河南省高校科技创新团队支持计划资助(2012IRTSTHN008);; 河南省基础与前沿技术研究计划项目(102300410018)

作者(Author): 朱利敏,李全安,张清,张兴渊

DOI: 10.13289/j.issn.1009-6264.2016.02.006

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