Mechanisms of Electrical Conductivity Improvement of CuCrZr Alloy Produced by Selective Laser Melting

doi:10.3901/JME.2022.17.297

Abstract

Abstract: In order to meet the requirements of high electrical conductivity of parts, the electrical conductivity of CuCrZr alloy formed by selective laser melting (SLM) is studied. First, a relative density of 99.37% is obtained after laser processing parameters optimization, and the influence of relative density and post heat treatments on the electrical conductivity are discussed in detail. The results show that the electrical conductivity of CuCrZr alloy has a strong linear relationship with relative density, and solution temperature and aging time also demonstrate significant influence on the thermal conductivity of CuCrZr alloy. During the solid solution treatments, the electrical conductivity of CuCrZr alloy decreases slightly and then increases with the increase of the solution time, while greatly decreases first and then increases with the increase of the solution temperature. During the aging process, the electrical conductivity gradually increases with the increase of the aging time and gradually stabilizes. The slower the cooling rate after heat treatment, the higher the electrical conductivity of the alloy. The best heat treatment of CuCrZr alloy is solid solution at 1 000 ℃ for 2 h followed by cooling in the furnace, achieving an electrical conductivity of 91.20±0.49% IACS. Compared with the existing research, the mechanism of heat treatment process to improve electrical conductivity is systematically analyzed and the direction of regulation is proposed, which provides a reference for additive manufacturing of high-conductivity alloys.

Key words: selective laser melting, CuCrZr alloy, heat treatment, electrical conductivity

CLC Number:

TG156

OU Yuanhui, WANG Di, LIU Linqing, YANG Yongqiang, HAN Changjun, TAO Zhenqing, YI Hao, DENG Cheng, TAN Chaolin, WU Guangzheng. Mechanisms of Electrical Conductivity Improvement of CuCrZr Alloy Produced by Selective Laser Melting[J]. Journal of Mechanical Engineering, 2022, 58(17): 297-308.

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