郑浩然,张志璇,谷亚楠,陈其嘉

• 1:滨州学院机电工程学院

摘要(Abstract)：

为解决因残余应力、组织不均匀性、成分偏析所造成的铸态Mg-3Zn-0.8Zr-1Y(mass%)合金性能不佳的问题，对其进行了固溶和时效处理，研究了热处理工艺对其显微组织、力学性能及耐腐蚀性能的影响。结果表明：Mg-3Zn-0.8Zr-1Y合金的最优热处理工艺是480℃均匀化退火12 h后520℃固溶处理12 h,最后在170℃时效24 h。均匀化退火处理缓解了铸态合金中的偏析现象，固溶处理使铸态合金中的W(Mg_3Y_2Zn_3)相基本融入α-Mg基体中形成过饱和固溶体，时效后组织中析出细小且弥散分布的纳米级短杆状Mg_2Zn_3和颗粒状Mg_4Zn_7第二相。与铸态合金相比，经最优工艺处理后合金的硬度、极限抗拉强度、屈服强度和伸长率分别提升到83.4 HV、204 MPa、139 MPa和12.5%,自腐蚀电位提高到-1.793 V(vs.SCE)、腐蚀电流密度降低到59.64μA/cm~2,腐蚀速率降低到1.36 mm/y,表明这种多步热处理工艺可以使Mg-3Zn-0.8Zr-1Y合金的强度、塑性和耐蚀性显著提高。

关键词(KeyWords)： Mg-Zn-Zr-Y合金;热处理;微观组织;力学性能;腐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 滨州学院科研基金项目(2021Y38)

作者(Author): 郑浩然,张志璇,谷亚楠,陈其嘉

DOI: 10.13289/j.issn.1009-6264.2022-0647

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