Surface nanocrystallization of Mg-3 wt.% Li-6 wt.% Al alloy by surface mechanical attrition treatment

被引：29

作者：

Zhang, Lehao ^{[1
]}

Zou, Yun ^{[3
]}

Wang, Hongtao ^{[2
]}

Meng, Liang ^{[1
]}

Liu, Jiabin ^{[1
]}

Zhang, Zhongwu ^{[3
]}

机构：

[1] Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Peoples R China

[3] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2016年 / 120卷

关键词：

Magnesium-lithium alloy; Surface mechanical attrition treatment; Grain refinement; Nanoindentation; Transmission electron microscope; INDUCED GRAIN-REFINEMENT; CLOSE-PACKED MAGNESIUM; SINGLE-CRYSTALS; NONBASAL SLIP; MICROSTRUCTURE; BEHAVIOR; DISLOCATIONS; EVOLUTION; SIZE; PLASTICITY;

D O I：

10.1016/j.matchar.2016.08.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A nanocrystalline surface layer was produced on Mg-3 wt.% Li-6 wt.% Al alloy by means of surface mechanical attrition treatment (SMAT). Microstructure features of various sections were systematically characterized by transmission electron microscopy. The results indicate that grain refinement induced by SMAT is dominated mainly by dislocation slip. Twinning is active at the early stage of grain refinement process when the grain size is large. The dislocation-dominated deformation mechanism is attributed to the change of c/a ratio due to the alloying of Li in Mg matrix and the suppression of twinning due to grain refinement. Nanoindentation results show that the hardness of the surface is enhanced by SMAT. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：124 / 128

页数：5

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