Ti与Al反应合成TiAl基合金的过程和机理

详细信息

PROCESS AND MECHANISM OF TiAl BASE ALLOY MADE BY REACTIVE SYNTHESIS BETWEEN Ti AND Al

摘要:
采用扫描电子显微镜对反应热压1:1的Ti-Al混合粉所制备的TiAl基合金致密体的显微结构和微区化学成分进行了观察和分析,根据Al元素的分布和各相存在的成分范围,发现Ti与Al反应过程中,首先在原Ti颗粒内部形成TiAl₃,TiAl,Ti₃Al和α-Ti四相。然后,反应在这四个固相间继续进行。随着Al元素的扩散和均匀化,已形成的TiAl₃和α-Ti相进一步反应而消失掉,最终,显微组织由TiAl和Ti₃Al两相构成。
- TiAl /
- 反应热压 /
- 机理
Abstract:
The microstructure and the chemical compositions in micro-zone of densified TiAl base alloy specimen manufactured from 1:1 Ti-Al mixture by reaction hot-pressing have been reviewed and analysed by using scanning electronic microscope.According to the distribution of Al element and composition range in various phases,it has been found that during the process of reaction between Ti and Al,four phases TiAl 3,TiAl,Ti₃Al and α-Ti were firstly formed in original Ti particles. Then continuous reaction among these four solid phases was carried out.With the diffusion and homogenization of Al element,the TiAl₃ and α-Ti phases which have been formed were eliminated.Finally,the microstructure was constituted by two phases TiAl and Ti₃Al.
- TiAl /
- reaction hot-pressing /
- mechanism