| METALS AND METAL MATRIX COMPOSITES |
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| The Formation Mechanism and Effect on Mechanical Properties of Defects of Aluminum Alloy by Selective Laser Melting: a Review |
| CHU Fuzhong1, ZHANG Xi2, HUANG Wenjing2, HOU Juan1, ZHANG Kai1,3,*, HUANG Aijun3
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1 School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Aircraft Design and Research Institute, Shanghai 201210, China;
3 Monash Centre for Additive Manufacturing, Monash University, Clayton 3800, Australia |
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Abstract As an additive manufacturing technology, selective laser melting (SLM) is capable of forming complex structures with high forming precision and is suitable for rapid prototyping of complex?structure components made of aluminum alloys. Due to their high specific strength and excellent mechanical properties, aluminum alloys are widely used in aerospace, automobile, and other industries that require lightweight materials. However, SLM aluminum alloys are prone to cracks, pores, residual stress, anisotropy, and balling. Defects are mainly caused by inappropriate process parameters and can restrict the use of SLM aluminum alloys. Therefore, insights into the formation mechanism of these defects can help control and mitigate their effects.
In this study, the common Al?Si cast aluminum alloy was used to review the current state of research on the defect formation mechanism of SLM aluminum alloys. This paper summarizes the effects of different process parameters on the defect formation and examines the relationship between defects and the mechanical properties of aluminum alloys. High porosity can reduce tensile strength and negatively affect the fatigue properties; however, fatigue resistance can be increased via an appropriate post?treatment.
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Published: 25 June 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China (52073176). |
| About author:: Fuzhong Chu received his B.E. degree from Nanchang Hangkong University in 2018, and currently studying for a master’s degree at School of Materials Science and Engineering, University of Shanghai for Science and Technology under the supervision of Prof. Kai Zhang and Prof. Juan Hou. His research has focused on additive manufactu-ring of aluminum alloys.Kai Zhang received his B.E degree from Central South University in 2011, and obtained the Ph.D. degree in material science from Monash University in 2016. After graduation, he has spent 5 years in doing post-doctoral research fellow in Monash Centre for Additive Manufacturing for research and industrial applications of additive manufacturing technologies. He is currently appointed as an associate professor in University of Shanghai for Science and Technology and also an adjunct research fellow in Monash University. His research fields include additive manufactu-ring technology improvement, new additive manufacturing material development, microstructure/mechanical performance correlation. |
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2021, Vol. 35 
