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Strengthening of cast Ti–25Nb–3Mo–3Zr–2Sn alloy through precipitation of α in two discrete crystallographic orientations
Journal article   Peer reviewed

Strengthening of cast Ti–25Nb–3Mo–3Zr–2Sn alloy through precipitation of α in two discrete crystallographic orientations

Mohanchand Paladugu, Damon Kent, Gui Wang, Zhentao Yu and Matthew S Dargusch
Materials Science & Engineering A, Vol.527(24-25), pp.6601-6606
2010
DOI: https://doi.org/10.1016/j.msea.2010.06.075
url
https://doi.org/10.1016/j.msea.2010.06.075View
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Abstract

Materials Engineering Mechanical Engineering near β titanium alloy mechanical properties nucleation habit plane casting precipitation
A detailed study of the microstructural development during aging of a Ti-25Nb-3Mo-3Zr-2Sn alloy is presented. Transmission electron microscopy observations show the as-cast microstructure is comprised of large β grains containing fine coherent ω precipitates. Fine scale α laths form in two different crystallographic orientations throughout the β matrix when the alloy is aged directly from the as-cast condition. The α laths typically have habit planes close to {1 1 1}β or {2 3 3}β. Aging at 450 °C doubles the yield strength as compared to that in the as-cast condition. We suggest that the differently orientated α laths may contribute to this significant increase in the strength of the alloy. Martensitic α″ phase, with its habit plane close to {4 3 3}β, was observed in the as-cast microstructure subsequent to deformation.

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Materials Science, Multidisciplinary
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Nanoscience & Nanotechnology
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