激光选区熔化AlSi7Mg合金的微观组织和力学性能

doi:10.11896/cldb.19040019

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Abstract The process of AlSi7Mg alloy fabricated by selective laser manufacturing (SLM) was studied. The microstructure and mechanical properties of as-built specimens using optimum process parameters and heat-treated specimens were analyzed. The results show that the tensile strength, yield strength and elongation of SLMed AlSi7Mg as-built specimens are much higher than those of casting AlSi7Mg, and horizontal as-built specimens could reach 435.78 MPa, 299.23 MPa and 14.36%, respectively. Heat treatment has a great influence on the microstructure and mechanical properties of SLMed specimens. After 350 ℃/3 h annealing, the elongation of the specimen increases to 30.83% and the tensile strength and yield strength decrease to 210.35 MPa and 152.01 MPa, respectively. It has been found that the size and shape of grains could be controlled in accordance with required microstructure and mechanical properties by changing process parameters and heat treatment conditions.

Key words： AlSi7Mg additive manufacturing selective laser melting microstructure mechanical property

Published: 26 April 2020

CLC number:

TG113.25

Corresponding Authors: Tianchun Zoureceived his B.E. degree from Beihang University in 1999 and received his Ph.D. in materials science from Tianjin University in 2007. He is currently an associate professor and master student supervisor in Civil Aviation University of China. His research has focus on aircraft materials and structures, emphatically on additive manufacturing in recent years.

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	ZOU Tianchun
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	ZHU He
	QIN Jiaxu

Cite this article:

ZOU Tianchun,OU Yao,ZHU He, et al. Microstructure and Mechanical Properties of Selective Laser Melted AlSi7Mg Alloy[J]. Materials Reports, 2020, 34(10): 10098-10102.

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http://www.mater-rep.com/EN/10.11896/cldb.19040019 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10098

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