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利用钛与硼之间的自蔓延高温合成反应经普通的熔铸工艺原位合成制备了 Ti B增强的钛基复合材料 .通过 XRD、SEM、TEM和 HREM等分析方法测试了合成材料的物相及微观结构 .结果表明 :原位合成的增强体为 Ti B,合金化元素铝的加入并不导致新相形成 ,增强体均匀地分布在基体合金上 .由于 Ti B的 B2 7结构导致 Ti B易于沿 [0 1 0 ]方向生长而长成短纤维状 .增强体与基体合金界面非常洁净 ,没有任何界面反应 .由于原位合成增强体的加入 ,复合材料的力学性能与基体合金比较有了明显的提高 .
TiB reinforced Ti matrix composites were synthesized by in-situ synthesis by self-propagating high temperature synthesis reaction between titanium and boron. The phases of the composites were tested by XRD, SEM, TEM and HREM. The results show that TiB is the reinforcement body synthesized in-situ, and the addition of alloying elemental aluminum does not lead to the formation of new phase and the reinforcement body is uniformly distributed on the matrix alloy.Because of the B2 7 structure of Ti B, Grows in the direction of [0 1 0] and grows into a short fiber.The interface between the reinforcement and the matrix alloy is very clean without any interfacial reaction.The mechanical properties of the composites are obviously compared with that of the matrix alloy due to the addition of in-situ composite reinforcements Improve.