原位反应渗透法TiCp/Mg复合材料的制备和性能

Fabrication and room-temperature compressive behavior of TiCp/Mg matrix composites by in situ reactive infiltration technique

利用Ti和C元素粉末间的原位放热反应合成TiCp,结合Mg熔体的自发渗透技术制备了TiCp/Mg以及TiCp/AZ91D两种镁基复合材料。观测了复合材料的相组成和原位反应生成物TiCp的形貌,研究了这两种镁基复合材料的常温压缩性能.结果表明,原位反应自发渗透技术制备的Mg基复合材料组织致密,增强相呈细小的颗粒状和互穿网片状,分布均匀.这是材料的压缩强度得到提高的原因.在常温以及应变速率为0.01 s^(-1)的条件下,TiCp/Mg和TiCp/AZ91D镁基复合材料的压缩强度分别达到598和650 MPa.

The in situ exothermic reaction between Ti and C elements combined with infiltration of molten magnesium into TiCp was adopted to fabricate TiCp/Mg and TiCp/AZ9lD magnesium matrix composites. The phase composition of the in situ formed reinforcement TiC and their morphologies were analyzed, and the room-temperature compressive behaviors were also studied for these two magnesium matrix composites. The results showed that dense composite microstructures were obtained by the present reactive infiltration process. The in situ TiCp reinforcement particulates uniformly formed within the Mg matrix and took in forms of fine particles, flakes and interpenetrating networks. The compressive strengths for the as-fabricated TiCp/Mg and TiCp/AZ91D composites reach about 598 and 650 MPa, respectively, at room temperature and a strain rate of 0.01 s-1.