铸造SiC_p/2024复合材料微观结构与强化机制的研究  

MICROSTRUCTURE OF CAST SiC_p/2024 Al COMPOSITE AND ITS STRENGTHENING MECHANISM

作　　者：林君山[1] 沙民[1] 沈文荣 李鹏兴[1] 吴人洁[1] 

机构地区：[1]上海交通大学

出　　处：《金属学报》1993年第9期B417-B423,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金及上海交通大学金属基复合材料国家重点实验室资助项目

摘　　要：研究了SiC体积分数分别为5,10,15和20%的2024Al基复合材料在峰值时效态下的微观结构和强化机制透射电镜观察和Vickers硬度测定表明:增强相的加入使复合材料基体中的位错密度升高,亚晶尺寸略有下降,但基体的硬度却无明显升高拉伸试验发现,弹性模量和加工硬化指数随SiC体积分数增加而显著提高。Microstructure of the cast SiC_p/2024 Al composites, containing 5, 10, 15 and 20 v.-% SiC particles, under peak-aged state and the strengthening mechanism have been studied by TEM observation and Vickers hardness measurements. An increase of dislocation density in the matrix and slight reduction of subgrain size may be caused by the reinforcement, but the hardness of the matrix increases no more. Tensile tests show that the elastic modulus and work hardening index increase obviously, and the initial flow stress de- creases first and increases afterwards with the increase of volume fraction of SiC particles. It is believed that the stress concentration and the deformation constraint by the reinforcement are two main factors in control of the plastic deformation and strengthening of the SiC_p/2024 composite.

关 键 词：复合材料 微粒增强 强化机制 

分 类 号：TB333[一般工业技术—材料科学与工程]