真空热压原位Al<sub>3</sub>Ti增强MgAl基复合材料合成机制

真空热压原位Al₃Ti增强MgAl基复合材料合成机制

摘要: 采用真空热压原位合成法制备Al₃Ti增强Mg-Al基复合材料。研究了烧结工艺对复合材料显微结构的影响。探讨了Al₃Ti的原位合成机制, 提出了Ti和Al的微观反应模型。采用XRD、 SEM等方法分析了复合材料的相组成及微观结构。结果表明, Mg-Al基复合材料组织致密, 原位合成增强相Al₃Ti颗粒在基体中均匀分布, 尺寸为0.5~2.0 μm, 与基体界面紧密结合, 同时存在少量残余的Ti和中间相Al-Ti。

Abstract: In-situ Al₃Ti reinforced Mg-Al matrix composites were prepared by vacuum hot-pressing. The mechanism of in-situ synthesized Al₃Ti was discussed and a model of micro structural reaction between Ti and Al was brought forward. Effects of sintering schedules on microstructures of composites were researched by methods, such as XRD and SEM. Results indicate that Mg-Al matrix composites are dense in structure, while uniformly distributed in-situ Al₃Ti particulates with the size of 0.5~2.0 μm are combined closely with Mg-Al matrix. Small quantities of remnant Ti and intermediate phases Al-Ti also exist.