Integration of CALPHAD calculations and nanoindentation test for the design of low-modulus near-β titanium
田悦言 1江坤维 1邓子旋 1王凯歌 1张宏宇 1刘立斌 2章立钢2
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作者信息
1. School of Materials Science and Engineering,Central South University,Changsha 410083,China
2. School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China
The elastic modulus of titanium is greatly influenced by the stability of the β-phase.Metastable β or near-β titanium with low β-phase stability and non-toxic elements can often achieve a lower elastic modulus.This study proposed a high efficiency composition design method combining CALPHAD calculations and nanoindentation test to design the Ti-Nb-Zr-Sn-Ta alloy with low modulus.By this method,a near-β titanium Ti-18Nb-8Zr-5Sn-2Ta with low-modulus,high-strength and good plasticity(elastic modulus(58.3±2.0)GPa,tensile strength(813.3±7.2)MPa,elongation(25.3±2.1)%)was developed.The experimental results showed that conventional molybdenum equivalent method overestimates the β-stability of Sn and Zr on titanium alloys,and Nb and Ta are more effective β-stabilizers for Ti-Nb-Zr-Sn-Ta alloy.
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