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研究了Ti-Al混合粉末在机械合金化过程中的粉体粒度、显微组织形貌和晶体结构,结果表明:层片复合结构的形成,为通过原子间的短距离扩散而实现固态合金化提供了空间条件;而引入了大量空位的畸变的晶体结构,为固态相变提供了热力学条件和动力学条件。其固态相变进程是,Al原子向α-Ti晶格内扩敝,首先形成α-Ti的过饱和固溶体,随后转变为Ti_3Al金属间化合物。
The particle size, microstructure and crystal structure of Ti-Al mixed powder during mechanical alloying were studied. The results show that the formation of composite structure of the layer, in order to achieve solid-state alloying by short-distance diffusion between atoms Provides the spatial conditions; and the introduction of a large number of vacancy distortion crystal structure, for the solid phase transformation provides thermodynamic and kinetic conditions. The solid-state transformation process is that the Al atoms expand into the α-Ti lattice and form the supersaturated solid solution of α-Ti firstly, then the Ti3Al intermetallic compound.