Phase transformation and mechanical properties of Ti-(10-30) Zr-3Mo-1Sn alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:780

Article

Cai, S.¹  Schaffer, J. E.¹  Gao, P.²  Wang, X.³  Ren, Y.⁴ 

[1] Ft Wayne Met Res Prod Corp, 9609 Ardmore Ave, Ft Wayne, IN 46809 USA

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

[3] Changan Univ, Sch Mat Sci & Engn, Xian 710061, Shaanxi, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA

关键词: Ni-free beta Ti;    Super-elasticity;    Lattice transformation strain;    Synchrotron;    Textures;   

DOI  :  10.1016/j.msea.2020.139172

来源: Elsevier

【 摘 要 】

Studies on three Ti-xZr-3Mo-1Sn (x=10-30 at.%) alloys found that the influences of Zr on phase transformation and mechanical properties are closely tied to its effect on beta-phase stability. It decreases the beta-transus by similar to 8.8 degrees C/at.%, suppresses the formation of alpha-phase or martensite during cooling and enhances the room temperature super-elasticity. The influence of Zr on lattice transformation strain is weak with the calculated maximum transformation strains of similar to 8% in all three alloys regardless of their large differences in Zr content. The largest recoverable strain of similar to 3.8% was obtained in alloy 30Zr after heat treatment at 600 degrees C. Heat treating at 600 degrees C produces a alpha+beta dual phase structure with unique texture patterns in alloys 10Zr and 20Zr. Although texture patterns of alpha and beta phases can be understood based on their crystal orientation relationship, mechanisms that caused these textures remain unknown. Aging at 200 degrees C for a short time increases the super-elastic strain without sacrificing material ductility and total recoverable strain.

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