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采用烧结及后续的镦粗工艺制备了铝硅共晶合金块体材料,研究了烧结温度对烧结体显微结构、抗压强度及相对密度的影响。结果表明:烧结温度显著影响烧结体的显微结构和抗压强度,以临近铝硅共晶合金液相线的温度烧结时,发生了局部熔化,产生的熔融液体破坏了颗粒表面的氧化膜,颗粒之间相互黏结,形成了烧结骨架。以优化的555℃烧结,Si颗粒呈球状,抗压强度达到最佳,但相对密度未发生变化。在后续的冷镦过程中,烧结骨架及粉末颗粒均产生变形,孔隙减小,颗粒呈扁平状,相对密度达到了98%。
Sintering and subsequent upsetting process was used to prepare bulk Al-Si eutectic alloy. The effects of sintering temperature on the microstructure, compressive strength and relative density of the sintered compact were studied. The results show that the sintering temperature significantly affects the microstructure and compressive strength of the sintered body and locally melts at a temperature near the liquidus temperature of the Al-Si eutectic alloy. The resulting molten liquid destroys the oxide film on the surface of the particles, Particles bonded to each other to form a sintered skeleton. With the optimized sintering at 555 ℃, the Si particles were spherical, the compressive strength reached the best, but the relative density did not change. In the subsequent cold forging process, the sintered skeleton and the powder particles are deformed, the pores are reduced, the particles are flat, the relative density of 98%.