原位生成Al_3Ti和TiB_2增强铝基复合材料的研究

Study on In-situ Aluminum Matrix Composite Reinforced by Al_3Ti and TiB_2

采用原位反应法制备(Al3Ti+TiB2)/ZL101原位复合材料,测试其室温力学性能,并通过OPM、TEM观察其微观组织。结果表明,原位复合材料经过热处理后,抗拉强度、伸长率以及布氏硬度分别提高了30.9%、17.1%、29.6%。原位复合材料增强相TiB2和Al3Ti弥散分布在α-Al中,Al3Ti呈棒状,几乎与α-Al完全共格;TiB2呈粒状。(TiB2+Al3Ti)/ZL101原位复合材料强韧化的主要机制是细晶强化和弥散强化。

The in-situ composites of （TiB2 ＋ Al3Ti）/ZL101 were prepared by solid-liquid reaction method. The mechanical properties at room temperature were tested and the microstructure were observed by OPM and TEM. The results show that the tensile strength, elongation and HV hardness of in-situ composites are increased by 30.9 %, 17.1% and 29.6 % respectively after heat treatment. The strengthening TiB2 and Al3Ti phases are dispersed in the matrix of α-Al, Al3Ti is rodlike and almost complete coherent with α-Al; TiB2 has granular shape. The main strengthening mechanism of the in-situ composites of （TiB2 ＋Al3Ti）/ZL101 is fine-grain strengthening and dispersion strengthening.