本文通过对一种Ｔｉ_３Ａｌ基金属间化合物（Ｓｕｐｅｒ－α_２）进行加氢处理，系统研究了由此引起的化合物显微组织的变化．实验结果表明，加氢处理会使Ｓｕｐｅｒ－α_２的显微组织发生明显变化，使连续缓慢冷却处理组织中的α_２相从正常处理下的近等轴状变成针状或魏氏组织状；并可使时效处理组织中析出相的形貌和分布更加规则和均匀．此外，加氢处理还可以促进组织中Ｏ相的形成．加氢处理的Ｓｕｐｅｒ－α_２在组织上发生变化的本质原因是，氢作为强β相稳定元素，显著地降低了化合物中α_２（或Ｏ相）／β的转变温度，并从热力学和动力学上强烈地影响β→α_２（及Ｏ相）的相转变过程．
Hydrogenation of a Ti3Al-based intermetallic(Super-α_2) was carried out to systematically investigate the microstructural variations of this compound.The experimental results showed that evident variations have taken place in microstructures of Super-α2 due to the hydrogenations.Acicular or Widmanstatten α2 was found to form in the hydrogenated microstructure under continuously cooling with slower rate,instead of nearly equiaxed α2 under the normal treatment.The precipitations in the hydrogenated microstructures undergoing ageing treatment showed more regular and homogeneous in morphology and distribution. Furthermore,the formation of O-phase in the microstructure was found to be promoted by the hydrogenation.The essential reason for these microstructural variations of Super-α2 caused by hydrogenation can be explained by the fact that hydrogen,as a strongβ-stabilising element,can significantly lower the α2/βtransition temperature of the compound and thus strongly affect,thermodynamically and dynamically,the transformation process of β→α2(or O-phase).
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