Microstructure and mechanical properties of Mg-Mn-Zn magnesium alloy with different Zn contents

被引：0
|
作者：
Lai L. [1 ]
Zhang K. [1 ]
Li X. [1 ]
Li Y. [1 ]
Ma M. [1 ]
Shi G. [1 ]
机构：
[1] State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2016年 / 40卷 / 06期
关键词：
Mechanical properties; Mg-Mn-Zn alloy; Microstructure; Structure uniformity;
D O I：
10.13373/j.cnki.cjrm.2016.06.006
中图分类号：
学科分类号：
摘要：
Mg-2.0Mn-xZn (x=0, 0.5, 1.0, 1.5, 2.0)(%, mass fraction) alloys were fabricated by adding a small amount of Zn into Mg-2.0%Mn alloys under conventional solidification. After hot extrusion deformation, the effects of small amount of Zn on the microstructure and mechanical property of Mg-2.0Mn-xZn alloy were investigated by optical microscope(OM), scanning electron microscope(SEM) and energy dispersion spectrometer(EDS). In the as-cast state and as-extruded state, the main second phase was α-Mn particle and Zn was dissolved in the matrix. A small addition of Zn had significant refining effect on the grain size of as-cast alloy. In the as-extruded alloy, the area of dynamic recrystallization increased and the mixed grain structure had a downward tendency with the increase of Zn addition. The strength and plasticity of extruded Mg-Mn-Zn alloy significantly improved with a small addition of Zn, the yield strength increased up to 42% and the elongation increased up to 57%. The improvement of strength diminished with the increase of Zn addition. The fracture morphology of extruded Mg-2.0Mn-xZn alloy mainly consisted of dimples and cleavage steps presented a mixed fracture morphology of ductile fracture and quasicleavage fracture. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：552 / 558
页数：6
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