Process optimization of additive manufactured sandwich panel structure using rare earth element modified high-performance Al alloy

GU Dongdong; ZHANG Han; LIU Gang; YANG Biqi

doi:10.7527/S1000-6893.2020.24868

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2021 , Vol. 42 >Issue 10: 524868 - 524868

DOI: https://doi.org/10.7527/S1000-6893.2020.24868

Article

Process optimization of additive manufactured sandwich panel structure using rare earth element modified high-performance Al alloy

GU Dongdong ,
ZHANG Han ,
LIU Gang ,
YANG Biqi

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1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Shanghai Institute of Spacecraft Equipment, Shanghai 200240, China

Received date: 2020-10-13

Revised date: 2020-11-07

Online published: 2020-12-14

Supported by

National Natural Science Foundation of China (51735005); National Key Research and Development Program (2016YFB1100101, 2018YFB1106302); The 15th Batch of "Six Talents Peaks" Innovative Talents Team Program (TD-GDZB-001); National Natural Science Foundation of China for Creative Research Groups (51921003)

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Abstract

The lightweight sandwich panel structure shows great potential in aerospace. The Selective Laser Melting (SLM) technology can overcome the limitations of traditional technology and produce the complex lattice structure with high quality. Rare earth element Sc modified Al-Mg alloy was applied as the raw material, and optimization of SLM processing of the Al-Mg-Sc-Zr alloy was conducted. Based on the optimization, SLM processing of Al-Mg-Sc-Zr sandwich panel structure was performed. Results show that the surface quality and metallurgical defects of the Al-Mg-Sc-Zr specimens processed by SLM were highly related to laser parameters. The superior surface morphology (roughness is 13.2 μm) and maximum relative density (99.5%) were obtained with laser power of 400 W and laser scan speed of 800 mm/s. When the scanning speed is low, Al₃Sc precipitations are formed at the bottom of the molten pool of the specimen, and when the scanning speed is too high, the precipitation phase decreases due to the too fast solidification speed, resulting in a decrease in the microhardness of the specimen. With the optimized process parameters, as the laser scan speed increased, the powder stickiness decreased and the weight of the Al-Mg-Sc-Zr sandwich panel structure processed by SLM decreased. The dimensional accuracy of horizontal components and the forming accuracy of truss micro-rods all increase with the increase of scanning speed.

Key words： laser additive manufacturing; selective laser melting; Al-Mg-Sc-Zr alloy; micro-truss lattice structure; processing quality

Cite this article

GU Dongdong , ZHANG Han , LIU Gang , YANG Biqi . Process optimization of additive manufactured sandwich panel structure using rare earth element modified high-performance Al alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021 , 42(10) : 524868 -524868 . DOI: 10.7527/S1000-6893.2020.24868

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