Diffusionless omega transformations in quenched and pressurized ZrMo alloys

O. Botstein, M. Talianker, A. Rabinkin

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Abstract

Metastable structures formed in ZrMo alloys on quenching and following high pressure application were studied by transmission electron microscopy and X-ray phase analysis. New structures consisting of a mixture of α phase and ω phase originating in α [i.e. ω(α)] were observed. Complex structures form in quenched Zr alloys with 1.5-2.5 at.% Mo which contain α,β and ω originating in both α and β. The maximum possible number of the co particle orientations (ω-variants) in a sample is seven: three for ω(α) and four for ω(β). High pressure application to the quenched structures gives rise to the α →ω(α) and β→ ω(β) transformation. Pressure induced ω phase can be retained at atmosphere pressure upon unloading. The genesis of various metastable structures is proposed by consideration of metastable phase equilibria existing in the ZrMo system.

Original languageEnglish
Pages (from-to)947-953
Number of pages7
JournalActa Metallurgica
Volume31
Issue number6
DOIs
StatePublished - 1 Jan 1983

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