林娜,杨开怀,陈文哲

• 1:漳州职业技术学院机械与自动化工程系
• 2:福建船政交通职业学院机械工程系
• 3:福州大学材料科学与工程学院
• 4:厦门理工学院材料科学与工程学院

摘要(Abstract)：

研究了具有不同析出相含量的AZ91D挤压镁合金在拉伸变形中出现的Portevin-Le Chatelier(PLC)现象,讨论了析出相对其产生PLC效应的影响规律,指出AZ91D挤压镁合金产生PLC效应的微观机理。结果表明:Al溶质原子的浓度是影响AZ91D挤压镁合金产生PLC效应的主要因素,β-Mg_(17)Al_(12)相的析出抑制了AZ91D挤压镁合金不稳定塑性行为。当β-Mg_(17)Al_(12)相析出量较高时,AZ91D挤压镁合金表现为稳定的塑性流变过程,其对应的应力-应变曲线为光滑的曲线;随着β-Mg_(17)Al_(12)相析出量的降低,固溶于Mg基体中的Al原子量增加,固溶体内溶质原子浓度提高,拉伸曲线表现出明显的锯齿屈服并逐渐剧烈,即AZ91D挤压镁合金的PLC效应随β-Mg_(17)Al_(12)相析出量的减少和Al溶质原子浓度的提高而增强;当β-Mg_(17)Al_(12)相含量为1.0mass%,对应的曲线上只出现一个锯齿抖动,这是AZ91D挤压镁合金产生PLC效应的临界状态。

关键词(KeyWords)： AZ91D挤压镁合金;热处理工艺;PLC效应;析出相

Abstract:

Keywords:

基金项目(Foundation): 福建省教育厅A类科技项目(JA14383);; 福建省高校杰出青年科研人才培养计划(JA14371);; 福建省交通厅重点项目(201210)

作者(Author): 林娜,杨开怀,陈文哲

DOI: 10.13289/j.issn.1009-6264.2016.02.005

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