Characterizing an in situ TiB2 particulates reinforced aluminium-based composite and its heat treatment
Metal matrix composites were fabricated in an Al-6Cu-0.2Mg-lMn matrix reinforced by particulates of in-situ TiB2 from reaction process via K2TiF6 and KBF4 salts in the matrix. Different percentage of TiB2, 1％, 3％ and 5％, respectively, was employed for the composite. A series of heat treatments comprised of solution treatment and aging were carried out on the composites. Phases, microstructures and Vickers-hardness were revealed for the differently treated composites and Al-6Cu-0.2Mg-lMn alloy. The results show that the in-situ TiB2 particulates can improve the structure of the matrix by retarding a directional growth of the matrix grains and forming isometric grains in the matrix. Remelting the composite with 3 wt％ TiB2 tended to weaken TiB2 particulates clustering. A significant effect on the refinement of the grain was observed when the content of TiB2 particulates was increased. And the Vickers hardness of the differently treated composites with 3％ or 5％ TiB2 was higher than that of the corresponding Al-6Cu-0.2Mg-lMn alloys. The composites precipitation rate was accelerated with the increase of the content of TiB2 particles during aging at 170℃.
Aluminum matrix composites TiB2partculates Insitu Microstructure Vickeshardness
XIE Fei XUE Zhong-hua
Materials Science and Engineering School, Changzhou University, Changzhou 213164, China Key Laborato Materials Science and Engineering School, Changzhou University, Changzhou 213164, China
国际会议
北京
英文
138-141
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）