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/AZ91D 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$^{-1}$.
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