(ZrB_2+Al_3Zr)/ZL101原位复合材料的力学性能与断裂行为  

Mechanical properties and crack behavior of In-situ Composite(ZrB_2+Al_3Zr)/ZL101

作　　者：石益海[1] 赵玉厚[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710032

出　　处：《铸造技术》2008年第2期209-212,共4页Foundry Technology

基　　金：陕西教育厅基金资助项目(06JK280)

摘　　要：采用原位反应法制备(ZrB2+Al3Zr)/ZL101原位复合材料,测试了其室温力学性能,并通过SEM观察其原位拉伸过程中的裂纹形成、扩展直至断裂的全过程。结果表明,原位复合材料经热处理后,抗拉强度、伸长率以及布氏硬度分别比基体提高了35.5%、12.2%、25.5%。原位拉伸研究表明:裂纹主要在共晶Si、断裂颗粒和内部原始缺陷处形核,整个裂纹的生长过程是,在主裂纹前端应力集中区内多个微裂纹形核、长大,相互连结,然后汇集到和主应力垂直方向上,形成宏观裂纹。In-situ composites of （ZrB2＋Al3Zr）/ZL1011 were prepared by solid-liquid reaction method. The mechanical properties at room temperature were tested and the crack initiation and propagation to fracture of in-situ tensile test was observed by SEM. The results show that the tensile strength, elongation and HB hardness of the in-situ composites are increased by 35.5 %, 12.2 % and 25.5 % respectively after heat treatment. Also it was discovered that cracks nucleated mainly at the eutectic Si, fractured particles and original defects. The whole process of crack formation was that micro-cracks nucleated, propagated and linked each other in the stress concentration zone of the tip of the main crack, then combined in the perpendicular direction of main stress to formation a macrocrack.

关 键 词：原位复合材料 力学性能 原位拉伸 断裂行为 

分 类 号：TB33[一般工业技术—材料科学与工程]