Effect of laser energy on microstructure of Mg-3Al-1Zn alloy treated by LSP

被引:25
作者
Ge, Mao-Zhong [1 ]
Xiang, Jian-Yun [2 ]
Fan, Z. [3 ]
Lu, Y. L. [1 ]
Lei, W. N. [3 ]
机构
[1] Jiangsu Univ Technol, Sch Mat Engn, Changzhou 213001, Peoples R China
[2] Changzhou Vocat Inst Light Ind, Mech Dept, Changzhou 213164, Peoples R China
[3] Jiangsu Univ Technol, Sch Mech Engn, Changzhou 213001, Peoples R China
关键词
Laser pulse energy; Mg-3Al-1Zn alloy; Microstructure; Laser shock peening; AZ31B MAGNESIUM ALLOY; STRESS-CORROSION CRACKING; SURFACE NANOCRYSTALLIZATION; GRAIN-REFINEMENT; STAINLESS-STEEL; ALUMINUM-ALLOY; RESISTANCE; BEHAVIOR; IMPACTS; GROWTH;
D O I
10.1016/j.jallcom.2017.11.032
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The microstructural feature, residual stress distribution and bending degree of Mg-3Al-1Zn alloy subjected to laser shock peening (LSP) under different laser pulse energy levels were investigated. The microstructure in the deformed layer was characterized by using transmission electron microscopy (TEM). The effects of different laser pulse energies on the micro-indent, residual stress and arc height were examined by three dimensional (3D) non-contact surface profilometer, X-ray diffractometer and arc height measurements. A nanostructured layer with the depth over 25 mu m was fabricated on laser peened Mg-3Al-1Zn alloy with laser pulse energy of 10.5 J. With laser pulse energy increasing, the grain size in the top surface decreased from 1.19 to 2.3 mu m for 6.5 J to 0.04-0.27 mu m for 8.5 J, and the depth of plastic deformation layer increased from 0.8 mm for 6.5 J to 0.95 mu m for 10.5 J. Moreover, residual stress and arc height of LSPed samples increased with laser pulse energy increasing. Grain refinement process in Mg-3Al-1Zn alloy under ultra-high strain rate generated by LSP was mainly due to dislocation slip. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:266 / 274
页数:9
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