引用本文:康燕平，李元东，陈体军，王晓东，高坤.表面纳米化工艺对半固态成形AZ91D镁合金显微组织的影响[J].中国表面工程,2011,24(3):43~48
KANG Yan-ping，LI Yuan-dong，CHEN Ti-jun, WANG Xiao-dong, GAO Kun.Influence of Surface Nanocrystallization Technological Parameters on Semisolid Forming AZ91D Magnesium Alloy[J].China Surface Engineering,2011,24(3):43~48
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表面纳米化工艺对半固态成形AZ91D镁合金显微组织的影响
康燕平，李元东，陈体军，王晓东，高坤
兰州理工大学 a. 甘肃省有色金属新材料省部共建国家重点实验室 b. 有色金属合金省部共建教育部重点实验室， 兰州 730050
摘要:
通过表面机械研磨处理在半固态成形AZ91D镁合金表面制备出纳米结构层；利用OM、XRD研究沿厚度方向变化的组织结构特征及变形层厚度与所用实验工艺参数的变化关系。结果表明：试样剧烈塑性变形层厚度随喷丸时间的延长呈先增大后趋于稳定的趋势；剧烈塑性变形层厚度随喷丸距离的增大呈先增后减的趋势, 弹丸体积分数与直径也有类似的规律。得出在实验所用的工艺参数中，最佳的工艺参数是喷丸距离13 mm，喷丸时间120 min，弹丸体积分数100%，弹丸直径Φ 8 mm，此条件下表层晶粒尺寸为20 nm左右，剧烈变形层厚度可达到53 μm。
关键词:  表面机械研磨处理  半固态成形  AZ91D镁合金  喷丸
DOI：
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基金项目:兰州理工大学博士科研启动基金项目（SB01200701）
Influence of Surface Nanocrystallization Technological Parameters on Semisolid Forming AZ91D Magnesium Alloy
KANG Yan-ping，LI Yuan-dong，CHEN Ti-jun, WANG Xiao-dong, GAO Kun
a.State Key Laboratory of Gansu Advanced Nonferrous Metal Materials b.Key Laboratory of Nonferrous Metal Alloys, the Ministry of Education, Lanzhou University of Technology, Lanzhou 730050
Abstract:
A nanocrystalline surface layer was fabricated on semisolid forming AZ91D magnesium alloy by using Surface Mechanical Attrition Treatment (SMAT). The microstructural characteristic of AZ91D magnesium alloy was investigated by using Xray diffraction and Optical Microscopy. The results show that the depth of serious plastic deformation layer increases with the prolonging of peening time first and then inclines to stable value; the depth of serious plastic deformation layer increases with peening distance first, and then decreased. The effect of the content and diameter of inputted balls is similar to the influence of the peening distance. Among the expererimental parameters, the optimal one is that the shot peening distance is 13 mm, the shot peening time is 120 min，the content of inputted balls is 100% and the diameter of inputted balls is 8 mm. The depth of deformation layer would reach to 53 μm and the grain size would reach to 20 nm.
Key words:  surface mechanical attrition treatment (SMAT)  semisolid forming  AZ91D magnesium alloy  shot peening
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