Redefining the β-Phase Stability in Ti-Nb-Zr Alloys for Alloy Design and Microstructural Prediction

Mehjabeen, A, Xu, W and Ma, Q 2018, 'Redefining the β-Phase Stability in Ti-Nb-Zr Alloys for Alloy Design and Microstructural Prediction', JOM, vol. 70, no. 10, pp. 2254-2259.


Document type: Journal Article
Collection: Journal Articles

Title Redefining the β-Phase Stability in Ti-Nb-Zr Alloys for Alloy Design and Microstructural Prediction
Author(s) Mehjabeen, A
Xu, W
Ma, Q
Year 2018
Journal name JOM
Volume number 70
Issue number 10
Start page 2254
End page 2259
Total pages 6
Publisher Springer New York LLC
Abstract β-Phase stability is a key consideration for the design of beta-titanium (beta-Ti) alloys and subsequent heat treatment and/or thermo-mechanical processing. The concept of the Mo equivalence (Mo-Eq), proposed by Molchanova (Phase diagrams of titanium alloys, 1965), has been commonly used as a general guideline to gauge the stability of a β-Ti alloy. A critical literature review has shown that all four existing Mo-Eq expressions deviate substantially from experimental observations and the well-established d-electron theory in predicting the beta-phase stability of Ti-Nb-Zr alloys. The reasons are that existing Mo-Eq expressions either completely neglect or significantly overestimate the beta-stabilizing effect of Zr. In this study, a new Mo-Eq expression, i.e., (Mo-Eq)(Ti-Nb-Zr) = 0.238Nb (wt.%) + 0.11Zr (wt.%) + 0.97, has been defined for Ti-Nb-Zr alloys in order to properly address the β-stabilizing effect of Zr. This new Mo-Eq expression showed proven consistency with both experimental observations and the d-electron theory in predicting the β-phase stability of various Ti-Nb-Zr alloys. With necessary modifications, the approach developed is expected to be also applicable to the assessment of the β-phase stability in other Zr-containing Ti alloys.
Subject Metals and Alloy Materials
DOI - identifier 10.1007/s11837-018-3010-1
Copyright notice © 2018 The Minerals, Metals & Materials Society
ISSN 1047-4838
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