采用元素粉球磨法,添加3%Si O2(质量分数,下同)作为增强颗粒,热压烧结制备出Si O2颗粒增强AZ91镁合金,并对其显微结构和室温力学性能进行测试分析。结果表明:当热压烧结温度低于580℃时,随温度升高,材料密度提高,晶粒大小未发生明显变化;但烧结温度超过580℃后,材料密度有所下降,晶粒明显长大,抗拉强度下降。AZ91-3%Si O2最佳热压烧结温度为580℃,材料的抗拉强度达114 MPa。 Si02 particle reinforced AZ91 magnesium alloy was prepared by the element ball milling method with 3% Si O2 (mass fraction, the same below) as the reinforcing particles, and the microstructure and room temperature mechanical properties were tested and analyzed. The results show that when the sintering temperature is lower than 580 ℃, the material density increases and the grain size does not change obviously with the increase of temperature. However, when the sintering temperature exceeds 580 ℃, the density of the material decreases and the grains grow obviously , Tensile strength decreased. AZ91-3% Si O2 best hot pressing temperature of 580 ℃, the tensile strength of the material up to 114 MPa.