细晶Mg-Ce中间合金的制备及其对AZ91D组织和性能的影响  

Preparation of Fine-grained Mg-Ce Master Alloy and Its Effect on Microstructure and Properties of AZ91D

作　　者：董天顺[1] 王拓[1] 郑晓东[1] 周秀锴 刘金海[1] 李国禄[1] 崔春翔[1] 

机构地区：[1]河北工业大学材料科学与工程学院,天津300132

出　　处：《材料导报》2017年第12期73-78,共6页Materials Reports

基　　金：河北省高等学校科学技术研究项目(ZD2014040);河北省自然科学基金重点项目(E2016202406);河北工业大学博士科研启动经费资助

摘　　要：为了探索细晶Mg-Ce中间合金对AZ91D的变质效果,通过铜模喷铸法制备了细晶Mg-Ce中间合金,在此基础上研究了其对AZ91D组织和性能的影响。结果表明:经过铜模喷铸获得的细晶Mg-Ce中间合金中Mg_(12)Ce相的平均尺寸由50μm下降至10μm,相比于粗晶Mg-Ce中间合金,组织显著细化;细晶Mg-Ce中间合金的变质效果好于粗晶Mg-Ce中间合金,采用细晶MgCe中间合金变质的AZ91D相较于粗晶Mg-Ce中间合金变质的AZ91D,抗拉强度提高了5.23%,延伸率提高了15.14%,维氏硬度提高了6.92%,腐蚀速率降低了44.62%。因此,铜模喷铸是提高Mg-Ce中间合金变质效果的有效手段。In order to research the modification effect of fine-grained Mg-Ce master alloy on AZ91D, fine-grained Mg-Ce mas- ter alloy was prepared by copper mold inject casting and the influence of it on the microstructure and properties of AZ91D alloy was investigated. Results showed that the size of Mg12 Ce phase in fine-grained Mg-Ce master alloy was reduced from 50 μm to 10μm, which indicated the fine-grained Mg-Ce master alloy had been refined dramatically. The modification effect of fine-grained Mg-Ce master alloy was better than that of coarse-grained Mg-Ce master alloy. Compared with AZ91D modified by coarse-grained Mg-Ce master alloy, the tensile strength, elongation rate and Brinell hardness of AZ91D modified by fine-grained Mg-Ce master alloy in- creased by 5.23%, 15. 14% and 6. 92% respectively, and the corrosion rate decreased by 44. 62%. Therefore, copper mold inject casting is an effective way to improve the modification effect of Mg-Ce master alloy.

关 键 词：铜模喷铸 细晶Mg-Ce中间合金 AZ91D 

分 类 号：TG146.2[一般工业技术—材料科学与工程]