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。
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,Ti 3Al 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 TiAl 3 and α Ti phases which have been formed were eliminated.Finally,the microstructure was constituted by two phases TiAl and Ti 3Al
出处
《粉末冶金技术》
CSCD
北大核心
1996年第4期249-252,共4页
Powder Metallurgy Technology
