增强体种类及含量对金属基复合材料力学性能的影响
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Keywords: 增强体种类,颗粒,金属基复合材料,力学性能
Abstract:
用粉末冶金法制备了氧化铝、碳化硅颗粒增强的几种铝合金复合材料,对不同增强体含量的复合材料进行了力学性能测试。研究结果表明,复合材料拉伸弹性模量随增强体含量增加而升高,断裂延伸率下降。SiCP/2024具有最高的强度和增强效率,随增强体含量增加至25%,强度逐渐升高;SiCP/7075的强度水平低于基体合金;SiCP/Al(工业纯)强度提高幅度较大;Al2O3P/2024的强度随增强体含量增加呈先上升、后下降趋势。分析认为不同复合材料间的这种性能差异由增强体与基体强度水平和变形行为特征所决定。高强度、高模量的增强体与高强度、高形变硬化率的基体的配合是获得高强度复合材料的重要条件。
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