MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Alloying Element X on Transformation Strains and Phase Stabilities between α′′ and β Ti-Nb-X (X = Al, Sn, Zr, Ta) Ternary Alloys from First-Principles Calculations
Daichi MinamiTokuteru UesugiYorinobu TakigawaKenji Higashi
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2016 Volume 57 Issue 3 Pages 263-268

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Abstract

The effect of alloying element X (X = Al, Sn, Zr, Ta) on the transformation strains and phase stabilities of Ti-12.5 at%Nb and Ti-25 at%Nb alloys was investigated. The principle strain, η2, was calculated as a function of the X concentration. The value of η2 of Ti-12.5 at%Nb-6.25 at%Zr was larger than that of Ti-12.5 at%Nb-6.25 at%Ta. This is consistent with the experimental results. The difference of solution energy, Δ Hsolα ” - β, was also calculated. The value of Δ Hsolα ” - β increased with the addition of Al, Sn, Zr, and Ta to Ti-12.5 at% Nb-6.25 at%X alloys. We found a good linear correlation between the experimental values for the decrease of the martensitic transformation start temperature (Ms), dMs/dc, and the calculated values of Δ Hsolα ” - β. The effect of the alloying element on the shape-memory properties of Ti-Nb-based alloys were evaluated from the first-principles calculations.

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© 2015 The Japan Institute of Metals and Materials
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