Formation of the gamma phase by a peritectoid reaction in the zirconium-hydrogen system

Mishra, S. ; Sivaramakrihnan, K. S. ; Asundi, M. K. (1972) Formation of the gamma phase by a peritectoid reaction in the zirconium-hydrogen system Journal of Nuclear Materials, 45 (3). pp. 235-244. ISSN 0022-3115

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002231...

Related URL: http://dx.doi.org/10.1016/0022-3115(72)90170-5

Abstract

Studies on the zirconium-hydrogen system have indicated that a peritectoid reaction occurs at about 255°C between the α and δ phases to give the γ phase. This reaction is dependent upon the interfacial contact and hence is sluggish if the two phases are in massive form. The γ is a stable phase of composition ZrH below 255°C and decomposes rapidly if heated above this temperature to give α and δ phases. Quenched α with saturated hydrogen, or δ of hightemperature composition, precipitate the γ phase at room temperature and require a long time for completion of the process. Non-equilibrium δ phase in a 49 at% hydrogen alloy, on β quenching and roomtemperature ageing, may transform fully to γ phase by a shear type of mechanism quite similar to the δ to ε transformation.

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ID Code:28629
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