【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179.6W·m^-1·K^-1，性能优于时效处理和固溶处理。更多还原

【Abstract】 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 1 μm to 3 μm 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 ℃^-1within 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.更多还原