纯镁锌钇共渗层组织分析及扩散时间对渗层的影响  

Microstructure Analysis of Zinc-yttrium Co-diffusing Layer on Pure Magnesium and Effect of Diffusion Time on Zinc-yttrium Coating

作　　者：郭玉玲[1,2,3] 梁伟[1,2] 王红霞[1,2] 赵兴国[1,2] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024 [3]晋中职业技术学院机电工程系,山西榆次030600

出　　处：《铸造技术》2010年第1期65-68,共4页Foundry Technology

基　　金：太原市明星专项基金(09121002);山西省青年科技研究基金(2008021033);山西省归国留学基金(2007-25);太原市大学生创新创业专项基金(07010727)

摘　　要：在400℃真空条件下,对纯镁进行表面锌钇共渗改性处理,研究了不同扩渗时间对合金化渗层的影响,采用OM、SEM、EDS、XRD和显微硬度测试等方法对渗层进行了组织结构和显微硬度分析。结果表明,随扩渗时间的延长,渗层厚度逐渐增加。锌钇共渗层组织均匀致密,由α-Mg饱和固溶体、金属间化合物Mg7Zn3及准晶相Mg30Zn60Y10组成,材料表层的显微硬度有大幅提高。Surface modification treatment on pure magnesium was conducted at 400℃ in vacuum conditions. The effect of diffusion time on microstructure of alloyed layers was investigated. The microstructure and micro-hardness of zinc-yttrium co-diffusing layer were investigated with OM, SEM, EDS, XRD and micro-hardness test. The results showed that the thickness of diffusion layer increases gradually with prolonging diffusion time. The microstructure of zinc-yttrium co-diffusing layer is uniformly and dense. The layer is composed of α-Mg saturate solution, inter-metallic compound Mg7Zn3 and I-phase（Mg30Zn60Y10）. The micro-hardness of the specimen surface layer has greatly improved.

关 键 词：纯镁 扩渗时间 锌钇共渗层 显微硬度 

分 类 号：TG156.8[金属学及工艺—热处理]