闫俞廷,牛立斌,龙裕轩,王晓刚,高冲

• 1:西安科技大学材料科学与工程学院
• 2:陕西省纳米材料与技术重点实验室
• 3:陕西省硅镁产业节能与多联产工程技术研究中心

摘要(Abstract)：

以工业级的粗镁和粗锌为原料,通过分别蒸发—混合—冷凝的方法得到合金试样,并分别对合金试样进行T4(340℃固溶处理24 h)、T6(340℃固溶处理24 h+175℃时效处理16 h)热处理。通过X射线衍射、扫描电镜、硬度计和拉伸强度测试仪对冷凝态、T4态以及T6态的显微组织、物相、力学性能以及断口形貌进行分析和表征。结果表明:冷凝态以α-Mg固溶体、MgZn和Mg_7Zn_3构成共晶组织为主,其形态以椭圆形、多角形以及层片状为主,断口为准解理断裂;T4处理后,合金中多角形以及层片状组织消失,而出现了黑色颗粒状组织,物相尺寸变大,韧窝数量增多,伸长率显著提升;T6处理后,合金内出现了树枝相,存在着大量的Mg_7Zn_3,α-Mg固溶体,MgZn,以及少量的MgZn_2,物相尺寸变小,断口内韧窝数量减少,撕裂棱数量增多,抗拉强度、硬度均有大幅度提升。

关键词(KeyWords)： Mg-Zn合金;气相合金化;热处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省纳米材料重点实验室开放课题(2016KF-01);; 榆林市产学研合作项目(2015CXY-01)

作者(Author): 闫俞廷,牛立斌,龙裕轩,王晓刚,高冲

DOI: 10.13289/j.issn.1009-6264.2018-0180

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