用高能球磨工艺制备Al--50Si合金粉末, 将粉末经冷压、烧结、热压等工艺制备出Al--50Si合金块体材料, 对球磨粉末和块体样品进行了显微组织观察、EDS分析和XRD分析, 测定了块体样品的密度、硬度和热扩散系数. 结果表明: 高能球磨后Al--50Si合金粉末的硅粒子明显细化, 其尺寸分布为1--15 μm; 在烧结过程中块体样品的硅粒子长大, 其尺寸增大到5--30 μm; Al--50Si合金块体材料具有较高的密度和硬度, 其室温热扩散系数为55 mm2 ?s-1.
High–energy ball milling and powder metallurgy process were applied to Al–Si powder to obtain Al–50Si composite. The microstructure and phases of the powder and alloy were investigated. And the density, hardness and TDC (thermal diffusivity coefficient) of the alloy were tested. The results show that Si particles were refined during high–energy ball milling process. The diameter of Si particles in the ball milled powder was between 1–15 μm. The diameter of Si particles in the consolidated alloy increased to 5–30 μm. The TDC of the alloy was 55 mm2·s−1 at room temperature.
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