Surface Nanocrystallization of AZ31B Magnesium Alloy Induced by Laser Shock Processing

被引：0
|
作者：
Ge Maozhong [1 ,2 ]
Xiang Jianyun [1 ,2 ]
Zhang Yongkang [1 ,2 ]
机构：
[1] Jiangsu Univ, Zhenjiang 212013, Peoples R China
[2] Changzhou Inst Light Ind Technol, Changzhou 213164, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2014年 / 43卷 / 04期
关键词：
laser shock processing; AZ31B; refinement mechanism; dislocation; twinning; MICROSTRUCTURE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
According to the optimized laser parameters, a nanostructured surface layer was fabricated on an AZ31B magnesium alloy by Laser Shock Processing (LSP). The microstructure of the nanocrystalline layer was characterized by means of X-ray diffraction (XRD) and transmission electron microscope (TEM), and the formation reasons of micro-twins as well as a possible grain refinement mechanism were discussed. The grain refinement mechanism is proposed as following: in original grains, dislocation slipping leads to the formation of dislocation tanglings and stress concentration leads to deformation twinning; in the subgrains and refined grains, dislocation tanglings and dislocation cells are formed continuously; dislocation tanglings are transformed into subgrains boundary with low angle, which divides coarse grains into subgrains; subboundaries are gradually developed into grain boundary with high angle, and finally nano-scale grains with equiaxed shape and random orientations are formed.
引用
收藏
页码：856 / 861
页数：6
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