Cu-Zr合金基体中TiB_2的原位反应合成

IN-SITU REACTION SYNTHESIS OF TiB_2 IN Cu-Zr ALLOYS

本文作者利用原位反应合成法制备了 Ti B2 / Cu- Zr复合材料 ,并对其显微结构进行了观察。分析了合成Ti B2 的反应过程。结果表明 :Ti B2 在 Cu- Zr基体中以两种形态存在 ,分布均匀 ,尺寸为 0 .5 μm～ 10 μm;在建立 Ti B2反应合成机制模型的基础上 ,简单描述了不同形态 Ti B2 的生长机制。

A TiB2/Cu-Zr composite was fabricated by an in-situ reaction synthesis method, and the microstructure of the composite was studied. The results show that TiB2 particles exist in two patterns, their distribution is homogeneous and the size is 0.5 μ-10 μm. A reaction model of TiB2 in molten metal is established combined with the thermodynamics of TiB2 particles in solid and liquid matrix. Finally, the growth mechanisms of two kinds of TiB2 particles are proposed.