喷射沉积Al-12Si-0.6Mg合金的微观组织与性能

共晶合金具有良好的激光焊接性能，为提高电子封装盖板用Al-12Si合金的强度并保持良好的热物理性能，采用喷射沉积与热压烧结技术制备Al-12Si合金，研究添加0.6% Mg对合金微观组织、力学性能和热物理性能的影响。结果表明，喷射沉积/热压烧结Al-12Si合金中Si相呈近球形颗粒，平均直径为（4.5±0.2）μm，均匀分布于Al基体中；添加Mg未对Si相尺寸和形貌产生显著影响，但是在Al基体中形成Mg₂Si相。相对于Al-12Si合金，Al-12Si-0.6Mg合金的热导率降幅仅为4.2%，但是抗拉强度从154.1 MPa提高到190.1 MPa，增幅达到23.4%，该强度改善主要归因于固溶强化和析出强化作用。 

Microstructure and properties of spray deposited Al-12Si-0.6Mg alloy

Eutectic alloy has good laser welding performance. To improve the strength and maintain good theromphysical properties of Al-12Si alloys for the electronic packaging cover material plate, the Al-12Si alloys were prepared by spray deposition and hot-pressing sintering technology. The effect of adding 0.6% Mg on the microstructure, mechanical properties, and thermophysical properties of the alloy were investigated. Results show that Si phase in spray deposited/hot pressed sintered Al-12Si alloy exhibits near spherical shape with an average size of (4.5±0.2)μm, which is homogeneously distributed in the Al matrix. The addition of Mg has not significant effect on the size and morphology of the Si phase, but Mg₂Si and β" secondary phases are formed in the Al matrix. Compared with Al-12Si alloy, the decrease of thermal conductivity of Al-12Si-0.6Mg alloy is only 4.2%, but the tensile strength has increased from 154.1 MPa to 190.1 MPa, with an increment of 23.4%, which is mainly attributed to solid solution strengthening and precipitation strengthening.