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| Microstructure and Properties of Al-30Si Alloy Produced by Selective Laser Melting |
QIN Yanli1, ZHAO Guangpu1, ZHANG Hao2( ), NI Dingrui2(), XIAO Bolv2, MA Zongyi2 |
1 Shenyang Ligong University, College of Science, Shenyang 110158, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Cite this article:
QIN Yanli, ZHAO Guangpu, ZHANG Hao, NI Dingrui, XIAO Bolv, MA Zongyi. Microstructure and Properties of Al-30Si Alloy Produced by Selective Laser Melting. Chinese Journal of Materials Research, 2024, 38(1): 43-50.
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Abstract The bulk material of the hyper-eutectic Al-30Si alloy was prepared via selective laser melting (SLM) technique, aiming to solve the problem of high brittleness, easy cracking, and difficulty in precise forming caused by the coarsening of primary Si in the alloy due to the coarsening of primary Si particles in the alloy during ordinary making process. Then the microstructure, mechanical properties, and thermal properties of the SLM alloy after stress-relief annealing were studied. The results showed that the room temperature tensile strength of the SLM Al-30Si alloy after annealing was 254 ± 3 MPa, which was 53.5% higher than that of the cast alloy. The hardness was 176.89 ± 8.5 HV and the specific stiffness was 35.18 m2/s2. In terms of thermal properties, the thermal expansion coefficient of the SLM Al-30Si alloy is 13.8 to 16.3 × 10-6/oC in the temperature range of -100~200oC, and the average thermal conductivity is 70.52 W·m-1·K-1. The study found that the rapid cooling characteristic of SLM could refine the primary Si particles, making the formed Al-30Si alloy have good comprehensive properties. The high specific stiffness and low thermal expansion coefficient are expected to maintain high dimensional stability for optical components.
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Received: 04 November 2022
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| Fund: National Natural Science Foundation of China(U21A2043);National Natural Science Foundation of China(51871215);Youth Innovation Promotion Association, CAS(2022191);Bintech-IMR R&D Program(GYY-JSBU-2022-010);Key Research Project of Liaoning Provincial Department of Education(LJKZ0238) |
Corresponding Authors:
ZHANG Hao, Tel: (024)23971752, E-mail: haozhang@imr.ac.cn;
NI Dingrui, Tel: (024)83970809, E-mail: drni@imr.ac.cn
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