郑留伟,梁伟,王红霞,边丽萍,王一德

• 1:太原理工大学材料科学与工程学院
• 2:先进镁基材料山西省重点实验室
• 3:山西工程职业技术学院
• 4:太原钢铁集团有限公司

摘要(Abstract)：

通过不同道次压下量和轧制道次的热轧成形实验,研究了不同变形条件对AZ91铸态镁合金组织和析出相演变的影响,以及合金在热轧变形中的开裂行为。实验结果表明:对AZ91镁合金多道次、小压下量轧制是实现其累积大塑性变形的途径之一。在实验轧制条件下,AZ91镁合金塑性变形仍以孪生变形为主,动态再结晶并未明显进行,仅在晶界及析出相附近发生部分不连续动态再结晶。轧制变形过程中,β-Mg_(17)Al_(12)相呈短条棒状或颗粒状分布于晶界附近,且尺寸更为细小。在晶界附近分布的脆性析出相成为微裂纹萌生的源头,随着累积变形量的增加,部分Mg_(17)Al_(12)相被轧碎形成二次裂纹,裂纹进一步沿晶界扩展,造成明显开裂现象。

关键词(KeyWords)： AZ91镁合金;热轧成形;孪生;Mg17Al12相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51474152);; 山西省回国留学人员科研资助项目(2014029)

作者(Author): 郑留伟,梁伟,王红霞,边丽萍,王一德

DOI: 10.13289/j.issn.1009-6264.2015.12.014

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