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Structural Stabilities of β-Ti Alloys Studied Using a New Mo Equivalent Derived from [β/(α + β)] Phase-Boundary Slopes

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Abstract

Structural stabilities of β-Ti alloys are generally investigated by an empirical Mo equivalent, which quantifies the stability contribution of each alloying element, M, in comparison to that of the major β-Ti stabilizer, Mo. In the present work, a new Mo equivalent (Moeq)Q is proposed, which uses the slopes of the boundary lines between the β and (α + β) phase zones in binary Ti-M phase diagrams. This (Moeq)Q reflects a simple fact that the β-Ti stability is enhanced, when the β phase zone is enlarged by a β-Ti stabilizer. It is expressed as (Moeq)Q = 1.0 Mo + 0.74 V + 1.01 W + 0.23 Nb + 0.30 Ta + 1.23 Fe + 1.10 Cr + 1.09 Cu + 1.67 Ni + 1.81 Co + 1.42 Mn + 0.38 Sn + 0.34 Zr + 0.99 Si − 0.57 Al (at. pct), where the equivalent coefficient of each element is the slope ratio of the [β/(α + β)] boundary line of the binary Ti-M phase diagram to that of the Ti-Mo. This (Moeq)Q is shown to reliably characterize the critical stability limit of multi-component β-Ti alloys with low Young’s moduli, where the critical lower limit for β stabilization is (Moeq)Q = 6.25 at. pct or 11.8 wt pct Mo.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51171035, 11174044, and 51131002).

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Authors and Affiliations

  1. Key Laboratory of Materials Modification by Laser, Ions and Electron Beams (Ministry of Education), & School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Qing Wang & Chuang Dong

  2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    Qing Wang & Peter K. Liaw

Authors
  1. Qing Wang
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  2. Chuang Dong
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  3. Peter K. Liaw
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Correspondence to Qing Wang or Peter K. Liaw.

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Manuscript submitted August 5, 2014.

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Wang, Q., Dong, C. & Liaw, P.K. Structural Stabilities of β-Ti Alloys Studied Using a New Mo Equivalent Derived from [β/(α + β)] Phase-Boundary Slopes. Metall Mater Trans A 46, 3440–3447 (2015). https://doi.org/10.1007/s11661-015-2923-3

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