Microstructure and properties of Al-70Si alloy prepared by laser cladding

作者：Hua, Peng^*; Liu, Ao; Li, Xianfen; Li, Rui; Cao, Yue; Zhou, Wei

来源：Journal of Materials Research, 2023, 38(22): 4927-4936.

DOI：10.1557/s43578-023-01202-7

• Laser cladding
• Al-70Si alloy
• Primary Si
• Solid solution treatment
• Thermo-physical properties

In this study, Al-70Si alloy was prepared by laser cladding. The effect of microstructure on the mechanical and thermo-physical properties was elucidated by comparing specimens prepared by laser cladding and casting methods. It is found that the laser cladding process can effectively reduce the formation of coarse primary silicon, which inevitably occurs in large quantities in cast samples. Therefore, various properties have been significantly improved. The tensile strength reaches 85 MPa, the thermal conductivity at room temperature is 76.6 W/(m center dot K), and the coefficient of thermal expansion (CTE) is 8.19 x 10-6/K. In addition, the solid solution treatment is able to spheroidize the primary silicon and passivate the sharp corners. The change in Si phase morphology can greatly reduce stress concentration and increase the degree of interfacial bonding. This resulted in an increase in tensile strength and thermal conductivity of 50.7% and 42.2%, respectively.

• 单位
  南阳理工学院