EFFECT OF HYDROGENATION ON MICROSTRUCTURE OF SUPER-α_2

Acta Metall Sin

1994, Vol. 30

Issue (6): 257-263 DOI:

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EFFECT OF HYDROGENATION ON MICROSTRUCTURE OF SUPER-α_2

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YANG Ke;LIAO Bo;LI Yiyi(Key Laboratory for Materials and Hydrogen of Liaoning Province;Institute of Metal Research;Chinese Academy of Sciences;Shenyang)(Manuscript received 27 October;1993;in revised form 8 December;1993). EFFECT OF HYDROGENATION ON MICROSTRUCTURE OF SUPER-α_2. Acta Metall Sin, 1994, 30(6): 257-263.

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Abstract 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).

Key words: hydrogen hydrogenation Ti_3Al-based intermetallic microstructure

Received: 18 June 1994

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