侯利锋,卫英慧,刘宝胜,许并社

• 1:太原理工大学材料科学与工程学院
• 2:太原理工大学材料科学与工程学院
• 3:太原理工大学材料科学与工程学院
• 4:太原理工大学材料科学与工程学院 太原山西030024太原理工大学教育部新材料界面科学与工程重点实验室

摘要(Abstract)：

利用表面机械研磨技术(SMAT)在AZ31B镁合金表面施加剧烈塑性变形,获得纳米晶组织的细化表层,利用光学显微镜、X射线衍射仪和透射电子显微镜研究由表层到心部的组织结构变化特征。结果表明:经过SMAT处理后,样品表层的晶粒尺寸大约为50nm:靠近基体的区域(大约距表面40μm),晶粒尺寸增加到约200nm。表面纳米化是通过孪晶分割和动态再结晶的共同作用实现的。硬度试验表明,SMAT后AZ31B镁合金样品表层的硬度显著提高,其原因可归结为两个主要的因素,即晶粒细化和加工硬化。

关键词(KeyWords)： 表面纳米化;镁合金;纳米晶;孪生;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50471070、50644041);; 山西省自然科学基金(20041023);; 山西省重点实验开发基金项目

作者(Author): 侯利锋,卫英慧,刘宝胜,许并社

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