A semi-empirical approach to the prediction of deformation behaviors of β-Ti alloys

SCRIPTA MATERIALIA

卷:158

Article

Wang, C. H.^1,2  Russell, A. M.^3,4  Cao, G. H.^1,2 

[1] Shanghai Univ, State Key Lab Adv Special Steel, 149 Yanchang Rd, Shanghai 200072, Peoples R China

[2] Shanghai Univ, Sch Mat Sci & Engn, 149 Yanchang Rd, Shanghai 200072, Peoples R China

[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[4] US DOE, Div Mat Sci & Engn, Ames Lab, Ames, IA 50011 USA

关键词: Titanium alloys;    Plastic deformation;    Twinning;    Stress-induced martensite;   

DOI  :  10.1016/j.scriptamat.2018.08.035

来源: Elsevier

【 摘 要 】

A semi-empirical approach based on the compositional average electron-to-atom ratio ((e/a) over bar) and atomic radius difference ((Delta r) over bar )was proposed to refine the d-electron method. The (e/a) over bar-(Delta r) over bar diagram shows that Twinning/Stress-Induced Martensite (SIM) activates when (Delta r) over bar > -2.5, and a low (e/a) over bar or absolute value of (Delta r) over bar favors Twinning/SIM by reducing the resistance of lattice shear. In addition to the phase stability, it suggests that the valence electron number and atomic radius of alloying element also determine the deformation mechanism in body-centered cubic Ti alloys. This alloy design method was verified by the tensile results of Ti-4Mo-4Co and Ti6Mo-4Zr (at.%) alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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