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TEM study of metastable β-phase decomposition in rapidly solidified Ti-6Al-4V alloy

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Abstract

A new rationale is presented for various decomposition products obtained from the metastable β-phase found in Ti-6A1-4V alloy produced by hot isostatic pressing comminuted melt-spun fibres and cooled to room temperature by furnace cooling. This alloy has an α-matrix with about 8 vol% retained β-phase, which is supersaturated with β-stabilizers to such an extent that the martensitic transformation has been suppressed. The metastable β-phase decomposes by different modes during continuous cooling, depending on the actual composition of individual β-grains. Less enrichment of vanadium and iron favours the direct formation of the equilibrium α-phase from the β-matrix, while greater enrichment of vanadium and iron leads to a spinodal decomposition of the metastable β-phase, resulting in a β+β′ two-phase structure. During further continuous cooling, the β′-phase which is lean in β-stabilizers will transform into isothermal ω-phase. In addition, an unknown phase has also been observed in the β-phase, which is typified by the appearance of 1/2{112}β reflections in the SAD patterns.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Surrey, GU2 5XH, Guildford, Surrey, UK

    Z. Fan & A. P. Miodownik

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  1. Z. Fan
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  2. A. P. Miodownik
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Fan, Z., Miodownik, A.P. TEM study of metastable β-phase decomposition in rapidly solidified Ti-6Al-4V alloy. JOURNAL OF MATERIALS SCIENCE 29, 6403–6412 (1994). https://doi.org/10.1007/BF00353996

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