New high-strength Ti–Al–V–Mo alloy: from high-throughput composition design to mechanical properties

Abstract

The high-throughput diffusion-multiple technique and thermodynamics databases were used to design new high-strength Ti alloys. The composition–microstructure–property relationships of the Ti64–xMo alloys were obtained. The phase fraction and composition of the α and β phases of the Ti64–xMo alloys were calculated using the Thermo-Calc software. After aging at 600°C, the Ti64–6Mo alloy precipitated ultrafine α phases. This phenomenon was explained on the basis of the pseudo-spinodal mechanism by calculating the Gibbs energy curves of the α and β phases of the Ti64–xMo alloys at 600°C. Bulk forged Ti64–6Mo alloy exhibited high strength and moderate plasticity after α/β-phase-field solution treatment plus aging. The tensile properties of the alloy were determined by the size and morphology of the primary and secondary α phases and by the β grain size.

Keywords

high-strength titanium alloy / Ti–6Al–4V–xMo / diffusion multiple / Thermo-Calc / microstructure and mechanical properties

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