Paper Title:
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.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
461-464
DOI
10.4028/www.scientific.net/MSF.638-642.461
Citation
T. Sakamoto, Y. Hiagaki, S. Kobayashi, K. Nakai, "Precipitation of β' Phase in a Low Cost Beta Titanium Alloy", Materials Science Forum, Vols. 638-642, pp. 461-464, 2010
Online since
January 2010
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