Precipitation of β' Phase in a Low Cost Beta Titanium Alloy

Tatsuaki Sakamoto; Yuri Hiagaki; Sengo Kobayashi; Kiyomichi Nakai

doi:10.4028/www.scientific.net/MSF.638-642.461

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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Precipitation of β' Phase in a Low Cost Beta...

Precipitation of β' Phase in a Low Cost Beta Titanium Alloy

Abstract:

Precipitation behavior of a metastable β Ti alloy, Ti-6.8Mo-4.5Fe-1.5Al(masss%), during two-step aging has been investigated. Supersaturated β phase after solution treatment decomposes into β+ω phases during the first aging at 300°C for 2ks. β′ phase is observed during the second aging at 500°C for 50s. It is suggested that reverse transformation of the ω phase to β phase during the second aging at 500°C for 50s gives rise to solute-lean and –rich regions in the β phase, and that β′ phase is formed in the solute-rich region. β′ phase being coherent with β phase has larger lattice parameter than β phase. β′ phase acts as nucleation site for α phase, and accelerates the nucleation of α phase.

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Materials Science Forum (Volumes 638-642)

Pages:

461-464

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.461

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Online since:

January 2010

Authors:

Tatsuaki Sakamoto, Yuri Hiagaki, Sengo Kobayashi, Kiyomichi Nakai

Keywords:

Metastable Beta Titanium Alloy, TEM, Two-Step Aging, ϐ' Phase

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