Computational thermodynamics and kinetics of displacive transformations in titanium-based alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:673

Article

Yan, Jia-Yi¹  Olson, G. B.² 

[1] KTH Royal Inst Technol, Dept Mat Sci & Engn, Brinellvagen 23, SE-10044 Stockholm, Sweden

[2] Northwestern Univ, Dept Mat Sci & Engn, 2220 Campus Dr, Evanston, IL 60208 USA

关键词: Titanium alloys;    Martensitic transformations;    Athermal omega phase;    Thermodynamics;    Kinetics;   

DOI  :  10.1016/j.jallcom.2016.02.251

来源: Elsevier

【 摘 要 】

The thermodynamics of Ti-based systems are described for beta-alpha'/alpha '' martensitic transformation and athermal omega formation at low temperatures. The new descriptions can better represent the relationship between the partitionless equilibrium temperature and the measured martensite-formation/reversion temperatures. The anomalous beta-stabilizing effects of Al, Sn, and Zr in ternary TieV/Nb-based alloys are well modeled for the first time. The Gibbs energy function of omega-Ti at ambient pressure is assessed. The formation temperature of athermal omega phase is assessed in some binary systems and estimated in some ternary systems based on electrical resistivity and first-principles calculations. The critical driving force for heterogeneous martensitic nucleation is modeled by solution-hardening interfacial friction using the present thermodynamic descriptions. The competition between martensite and athermal omega phase can be understood based on their transformation thermodynamic and kinetic factors. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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