沙桂英,徐永波,于涛,张修丽,韩恩厚,刘路

• 1:中科院金属研究所沈阳材料科学国家(联合)实验室
• 2:中科院金属研究所沈阳材料科学国家(联合)实验室
• 3:沈阳航空工业学院材料工程系
• 4:上海工程技术大学

摘要(Abstract)：

利用Hopkinson压杆技术对AZ91镁合金进行了冲击压缩实验,分析了该合金在铸态和固溶及时效处理后的动态应力-应变行为及其应变率效应。结果表明:在102-103s-1应变率下,随应变率提高,AZ91镁合金在铸态和固溶及时效处理后的应力-应变曲线均具有先升高(正应变率效应)而后下降(负应变率效应)的特性,最大应变也连续增大,且随应变增加,流动应力显著增大。这主要是-αMg基体的加工硬化、-βMg17Al12相和Mg-Al-Mn相的晶界强化与沉淀强化、热软化及孔洞或裂纹的产生与发展所致。

关键词(KeyWords)： AZ91镁合金;应变率;应力-应变行为;微观结构

Abstract:

Keywords:

基金项目(Foundation): 国家“863”项目(2002AA331120);; 沈阳航空工业学院科研基金项目(04YB01)

作者(Author): 沙桂英,徐永波,于涛,张修丽,韩恩厚,刘路

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