热处理对激光粉末床熔融AlSi10Mg合金热物理性能的影响  

Effect of heat treatment on thermophysical properties of laser powder bed fusion formed AlSi10Mg alloy

作　　者：秦艳利[1] 贾煜琦 张昊[2] 倪丁瑞[2] 肖伯律[2] 马宗义[2] QIN Yanli;JIA Yuqi;ZHANG Hao;NI Dingrui;XIAO Bolyu;MA Zongyi(College of Science,Shenyang Ligong University,Shenyang 110158,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳理工大学理学院,沈阳110158 [2]中国科学院金属研究所,沈阳110016

出　　处：《航空材料学报》2024年第2期184-191,共8页Journal of Aeronautical Materials

基　　金：国家自然科学基金项目(U21A2043);中国科学院青年创新促进会项目(2022191);魏桥国科高研院-中科院金属所研发项目(GYY-JSBU-2022-010);辽宁省教育厅面上重点项目(LJKZ0238)。

摘　　要：采用激光粉末床熔融(laser powder bed fusion,LPBF)法成功制备AlSi10Mg合金样品,研究130℃/4 h时效处理、236℃/10 h退火处理和540℃/1 h固溶处理三种热处理工艺对AlSi10Mg合金样品的微观组织的影响,以及热处理后AlSi10Mg合金在室温~400℃的温度范围内热膨胀系数和热导率演变规律。结果表明:时效处理后铝基体中析出球状的Si颗粒,仍然保留完整的网状共晶硅组织;退火后,网状共晶硅完全消失,球化Si颗粒均匀分布在基体中;固溶处理后出现大的块状Si颗粒,尺寸在1~3μm;经过热处理之后AlSi10Mg合金的热物理性能均优于打印态。退火处理后的合金样品在室温到400℃的热膨胀系数为1.64×10^(−5)~2.1×10^(−5)℃^(−1),平均热导率为179.6 W·m^(−1)·K^(−1),性能优于时效处理和固溶处理。The AlSi10Mg alloy samples were successfully prepared by laser powder bed fusion(LPBF).The effects of three kinds of heat treatment process,namely 130℃/4 h aging treatment,236℃/10 h annealing treatment,and 540℃/1 h solid solution treatment on the microstructure of the AlSi10Mg samples were investigated.After heat treatment,the evolution of coefficient of thermal expansion(CTE)and thermal conductivity of the AlSi10Mg alloy in the temperature range from room temperature to 400℃was examined.The results show that spherical Si particles are precipitated within the aluminum matrix,while the complete networklike eutectic silicon structure is retained after aging treatment.After annealing,the network-like silicon structure is disappeared completely,and spherical Si particles are uniformly distributed within the matrix.After solution treatment,large blocky Si particles with the sizes from 1μm to 3μm appear.The thermal properties of the AlSi10Mg alloy have been improved significantly after heat treatment compared to the as-printed state.In particular,the CTE of alloy subjected to annealing is 1.64×10^(−5)℃^(−1) to 2.1×10^(−5)℃^(−1) within the temperature range from room temperature to 400℃,the average thermal conductivity is 179.6 W·m^(−1)·K^(−1),the performance is superior to ageing and solution treatments.

关 键 词：AlSi10Mg 激光粉末床熔融 热处理 微观结构 热物理性能 

分 类 号：O436[机械工程—光学工程]