王凌浩,杨斌,伍先明,李家学,单陇红

• 1:广东理工学院工业自动化系
• 2:湖南科技大学材料科学与工程学院

摘要(Abstract)：

通过热模拟压缩试验研究了挤压态AZ41M镁合金在应变速率为0.005～1 s~(-1)、温度为300～450℃条件下的热变形行为。利用光学显微镜分析了合金热变形过程中的组织演变。结果表明:挤压态AZ41M镁合金热变形过程中,真应力应变曲线表现出典型的单峰动态再结晶(DRX)特征,合金具有比较高的温度和应变速率敏感性;合金热变形过程中,DRX会促进晶粒细化,且应变速率越小,温度越高,合金越容易发生动态再结晶;温度的升高可以促进合金DRX的发生与晶粒长大,能改善合金变形的不均匀性,但温度过高会导致晶粒尺寸粗大不均匀;应变速率越大,变形量越大,晶粒尺寸越细小且更均匀;合金热变形过程中,DRX形核机制主要受温度影响,应变速率与变形量对其影响较小,在温度较低(300℃)时,合金主要以弓弯形核机制发生不连续动态再结晶,在较高温度(450℃)时,同时存在弓弯形核不连续动态再结晶形式和孪晶诱变形核连续动态再结晶形式。

关键词(KeyWords)： 挤压态AZ41M镁合金;组织演变;动态再结晶;形核机制

Abstract:

Keywords:

基金项目(Foundation): 广东省普通高校特色创新类项目(2017KTSCX203);; 广东省普通高校青年创新人才类项目(2018KQNCX311);; 广东理工学院创新强校工程(GKJ2018003)

作者(Author): 王凌浩,杨斌,伍先明,李家学,单陇红

DOI: 10.13289/j.issn.1009-6264.2020-0273

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