Microstructure and mechanical properties of AZ91D fabricated by selective laser melting

被引：0
|
作者：
Yi L. [1 ,2 ]
Chang C. [2 ]
Dai Y.-L. [1 ]
Liu M. [2 ]
Pan C. [3 ]
Yan X.-C. [2 ]
机构：
[1] School of Materials Science and Engineering, Xiangtan University, Xiangtan
[2] Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou
[3] Beijing Chunlizhengda Medical Instruments Co., Ltd., Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 08期
关键词：
AZ91D magnesium alloy; mechanical property; microstructure; processing parameter; selective laser melting;
D O I：
10.11817/j.ysxb.1004.0609.2023-43850
中图分类号：
学科分类号：
摘要：
A series of AZ91D magnesium alloy specimens were fabricated using selective laser melting (SLM) technology to investigate the effect of volumetric energy density on the micro-defects distribution of the AZ91D specimens. The microstructural evolution, main phases and mechanical properties of the SLM AZ91D samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and mechanical properties tests. The results show that the densities of the specimens were the highest with the power of 130 W, scanning speed of 30 mm/s, and volumetric energy density of 144.44 J/mm3. The phase composition of SLM AZ91D alloy is confirmed as α-Mg and β-Mg17Al12, phases. The melt pool edge is composed of the honeycomb-like structure of equiaxed grains and columnar grains. Comparing with the as-cast AZ91D specimen, the grain size of the SLM AZ91D specimen is finer than that of the as-cast AZ91D specimen (average grain size of 1.013 μm), and its microhardness (97.10HV0.1) and tensile strength (316 MPa) are higher than those of the as-cast AZ91D specimens (76.61HV0.1; 208 MPa). © 2023 Central South University of Technology. All rights reserved.
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页码：2483 / 2495
页数：12
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