选区激光熔化成型铝合金的研究现状及展望

doi:10.11896/cldb.20060035

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Abstract With the increasing demand for lightweighting in aerospace and automobiles, the integration of structurally optimized complex metal components with additive manufacturing technology is bound to be the future development trend of the high-end product manufacturing industry. The excellent comprehensive performance of aluminum alloy and the far lower price than titanium alloy make it have great application and research potential in additive manufacturing. There are many methods of metal additive manufacturing. Selective laser melting (SLM) has attracted the attention of scientific research and industry because of its excellent surface quality and comprehensive performance, which has significant advantages in the forming of parts with complex structures and thin-walled structure integration.
However, due to the characteristics of high laser reflectivity, high thermal conductivity, poor fluidity and easy reaction with oxygen,the molded parts are prone to metallurgical defects such as balling, cracks, pores and oxidation inclusions, which cannot meet the performance requirements in practical applications. AlSi10Mg, Al-12Si and other cast aluminum alloys studied deeply can not meet the strength in many fields. High-strength alloys are extremely prone to undesirable phenomena such as element burning and cracking during SLM forming. Therefore, it has become the research focus to develop a series of new aluminum alloy powders and clarify the formation mechanism of various defects to reduce the generation of defects during the SLM process.
In this paper, the researchstatus of aluminum alloy by SLM in recent years has been introduced from three aspects: Al-Si casting alloy, high strength aluminum alloy,and aluminum matrix composite. In view of the dilemma of aluminum alloys formed by SLM, such as the parameters of process conditions are immature, the metallurgical defects are difficult to control, and the quantitative research between part performance and microstructure is not systematic. The author proposes that the concept of material genetic engineering (MGE) can be introduced and combined with artificial intelligence technology to seek a quantitative relationship between composition-microstructure-process-performance. It is helpful to develop a new type of aluminum alloy powder suitable for SLM characteristics, and achieve the purpose of reverse design of material composition and process from the application requirements.

Key words： selective laser melting (SLM) aluminium alloy aluminum matrix composite metallurgical defect material genetic engineering (MGE)

Published: 10 December 2021 Online: 2021-12-23

CLC number:

TB31

Fund:National Natural Science Foundation of China (51874038), Key-area Research and Development Program of Guangdong Province (2019B010942001)

Corresponding Authors: sbren@ustb.edu.cn

About author: Jianguo Huang received his B.E. degree in material processing from Jiangxi University of Science and Technology in 2019. He is currently pursuing a master's degree at the Institute for Advanced Materials and Technology, University of Science & Technology Beijing under the supervision of Prof. Shubin Ren. His research has focused on metal 3D printing and metal matrix composite materials.
Shubin Ren received his B.E. degree in materials from University of Science & Technology Beijing in 2002 and received his Ph.D. degree in 2007. He is now a professor and doctoral supervisor of the Institute for Advanced Materials and Technology, University of Science & Technology Beijing. His research interests are metal matrix composite materials, metal 3D printing, powder metallurgy porous materials, and special alloy materials for steam turbines.

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Cite this article:

HUANG Jianguo,REN Shubin. Research Status and Prospect of Aluminum Alloy Manufactured by Selective Laser Melting[J]. Materials Reports, 2021, 35(23): 23142-23152.

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http://www.mater-rep.com/EN/10.11896/cldb.20060035 OR http://www.mater-rep.com/EN/Y2021/V35/I23/23142

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