张聪国,张大童,邱诚,张文

• 1:华南理工大学国家金属材料近净成形工程技术研究中心

摘要(Abstract)：

通过重叠率为0.5的多道次搅拌摩擦加工(Multi-pass friction stir processing,MFSP)成功制备出了无缺陷的AZ31镁合金宽板,对板材的组织、宏观织构、各方向的拉伸性能及断口形貌等进行了测试分析。结果表明,由于搅拌区的动态再结晶作用,板材的晶粒尺寸从165μm细化到12.9μm,细化效果显著。与轧制母材相比,MFSP宽板的抗拉强度与屈服强度有所下降,但是塑性得到了明显提高,加工方向伸长率由16%提高到46.6%,垂直于加工方向的样品伸长率由16%提高到24.4%。板材的力学性能存在一定的各向异性,通过断口观察发现这可能与多道次加工的不均匀过渡区有关。

关键词(KeyWords)： 搅拌摩擦加工;多道次;AZ31镁合金;晶粒细化;各向异性

Abstract:

Keywords:

基金项目(Foundation): 广东省自然科学基金团队项目(2015A030312003)

作者(Author): 张聪国,张大童,邱诚,张文

DOI: 10.13289/j.issn.1009-6264.2019-0474

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