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以Al-12%Si和Zr(CO3)2作为反应组元,通过原位反应法制备出Al2O3,Al3Zr颗粒增强铝硅基复合材料,通过快速凝固成型得到铸态试样.用热膨胀仪测试了材料在50～500℃范围内的膨胀位移与温度的关系,进而得出平均线膨胀系数.结果表明:在同一温度条件下,随颗粒理论体积分数增加,复合材料的平均线膨胀系数减小.温度是影响平均线膨胀系数的重要因素.当试样温度在50～300℃时,随温度增加,平均线膨胀系数逐渐增加;当试样温度在300～500℃时,随温度增加,平均线膨胀系数逐渐减小;300℃时平均线膨胀系数最大.用Rom、Turner和Kerner模型计算了理论热膨胀系数.比较发现,实测值更接近Turner模型理论预测值.最后通过界面残余热应力分析指出具有高温低膨胀性的(Al2O3+Al3Zr)p/Al-12%Si颗粒增强铝基复合材料能有效防止材料高温时的塑性变形.
Al2O3-Al3Zr particles reinforced Al-Si matrix composites were prepared by in-situ reaction using Al-12% Si and Zr (CO3) 2 as reaction components, and the as-cast samples were obtained by rapid solidification. The results show that the average linear thermal expansion coefficient decreases with the increase of the theoretical volume fraction of the particles at the same temperature. Temperature is an important factor affecting the average coefficient of linear expansion.When the sample temperature is in the range of 50 ~ 300 ℃, the average coefficient of linear expansion increases with increasing temperature.When the sample temperature is in the range of 300 ~ 500 ℃, the average line The coefficient of thermal expansion is gradually reduced and the average coefficient of linear expansion is the largest at 300 ℃ .The theoretical coefficient of thermal expansion is calculated by Rom, Turner and Kerner models.Compared with Turner model, the measured values are closer to the predictions of Turner model.Finally, High temperature and low expansion of (Al2O3 + Al3Zr) p / Al-12% Si particle reinforced aluminum matrix composites can effectively prevent the plastic deformation of materials at high temperature.