摘要
采用选区激光熔化技术(SLM)成形了AlMgMnScZr合金,研究了不同时效处理温度对其组织和力学性能的影响。结果表明,时效处理能够显著改善合金的力学性能,这主要是由于合金在时效处理过程中析出高密度且弥散分布的纳米析出相,可以阻碍位错运动进而提高材料强度。随着时效温度升高,析出相尺寸增大,其显微硬度和强度逐渐降低,塑性逐渐升高。合金经325℃×4 h后随炉冷却能够获得优异的综合力学性能,其显微硬度(HV_(0.3))约为164,抗拉强度达525 MPa,伸长率约为19%。
AlMgMnScZr alloy was fabricated by selective laser melting(SLM), and the effects of different aging temperatures on the microstructure and mechanical properties of the alloy were investigated. The results indicate that the aging process can significantly improve the mechanical properties of the SLMed AlMgMnScZr alloy due to the high density and homogenously dispersed nano-precipitates during the aging process, which can strongly hinder the dislocation movement and improve the strength of the alloy. With the increase of aging temperature, the size of precipitates in the alloy is increased, and microhardness and strength of the alloy are decreased gradually, while the plasticity is increased instead. After 325 ℃×4 h and furnace cooling, SLMed AlMgMnScZr alloy obtain excellent comprehensive mechanical properties, where the microhardness(HV_(0.3)), the tensile strength and the elongation are 164, 525 MPa and 19%, respectively.
作者
林育林
王迪
王智
Lin Yulin;Wang Di;Wang Zhi(Guangdong Key Laboratory for Advanced Metallic Materials Processing,South China University of Technology;School of Mechanical and Automotive Engineeril,South China University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第1期17-22,共6页
Special Casting & Nonferrous Alloys
基金
国家重点研发计划政府间重点专项资助项目(2019YFE0110700)
广东省自然科学基金资助项目(2020A1515011242)
广东省国际科技合作领域粤港澳大湾区国际科技创新中心建设基金资助项目(2021A0505050002)
高端外国专家引进计划资助项目(G2021163004L)。
作者简介
第一作者:林育林,男,1997年出生,硕士研究生,广州(510640),E-mail:136644295@qq.com;通信作者:王智,男,1982年出生,教授,广州(510640),E-mail:wangzhi@scut.edu.cn。
