Al-Zr(CO_3)_2体系反应合成复合材料的力学性能与断裂行为①  

Mechanical properties and crack behavior of in-situ composites synthesized in Al-Zr(CO_3)_2 reaction system

作　　者：孙建祥[1] 赵玉涛[1] 戴起勋[1] 程晓农[1] 蔡兰[2] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013 [2]江苏大学机械工程学院,镇江212013

出　　处：《中国有色金属学报》2004年第7期1228-1233,共6页The Chinese Journal of Nonferrous Metals

基　　金：教育部重点基金资助项目(2000156);江苏省教育厅基金资助项目(01KJB430003);江苏省科技攻关资助项目(BE2002039);江苏省高校高新技术产业发展资助项目(JH02 039);江苏大学高级人才基金项目资助

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。A new in-situ reactive system of Al-Zr(CO_3)_2 is used to prepare(Al_3Zr+Al_2O_3)_p/Al composites by melt method reaction. The XRD and SEM analysis indicate that the particles formed are fine Al_3Zr and Al_2O_3, 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.

关 键 词：原位熔体反应法 拉伸实验 裂纹 位错 

分 类 号：TB331[一般工业技术—材料科学与工程]