【摘要】 利用Al Zr(CO3)2原位反应体系,采用熔体反应法制备了(Al3Zr+Al2O3)p/Al复合材料。XRD及SEM分析显示:原位反应生成的颗粒为Al3Zr和Al2O3,颗粒细小并均匀分布在基体中。拉伸实验表明:(Al3Zr+Al2O3)p/Al复合材料的抗拉强度和屈服强度随颗粒含量的增大显著提高,当颗粒体积分数为10%时,复合材料的抗拉强度和屈服强度分别为148.3MPa和110.5MPa,但延伸率先上升后下降。原位拉伸研究表明:复合材料拉伸过程中裂纹的萌生及扩展机制可从两方面得到解释:滑移过程中的位错作用机制以及颗粒脱粘和破碎形成的"孔洞"成核与长大机制。更多还原

【Abstract】 A new in-situ reactive system of Al-Zr（CO₃）₂ is used to prepare（Al₃Zr+Al₂O₃）_p/Al composites by melt method reaction. The XRD and SEM analysis indicate that the particles formed are fine Al₃Zr and Al₂O₃, which are well distributed in the aluminum matrix. The ultimate tensile strength and yield strength are improved by increasing the volume fraction of the particle. The tensile properties are σ_b=148.3 MPa and σ_s=110.5 MPa when the particle volume fraction is 10%. But the elongation goes up firstly but then decreases. Crack initiation and propagation were observed by in-situ tensile experiment. The crack initiation and propagation can be interpreted with dislocation action mechanism and voids necleation and growth mechanism.更多还原