Stress-induced phase transformation and room temperature aging in Ti-Nb-Fe alloys

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

卷:680

Article

Cai, S.¹  Schaffer, J. E.¹  Ren, Y.² 

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

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

关键词: Beta Ti alloy;    Synchrotron X-ray;    Stress-induced phase transformation;    Room temperature aging;    Super-elasticity;    Omega phase;   

DOI  :  10.1016/j.msea.2016.10.060

来源: Elsevier

【 摘 要 】

Room temperature deformation behavior of Ti-17Nb-1Fe and Ti-17Nb-2Fe alloys was studied by synchrotron X-ray diffraction and tensile testing. It was found that, after proper heat treatment, both alloys were able to recover a deformation strain of above 3.5% due to the Stress-induced Martensite (SIM) phase transformation. Higher Fe content increased the beta phase stability and onset stress for SIM transformation. A strong {110}(beta) texture was produced in Ti-17Nb-2Fe compared to the {210}(beta) texture that was observed in Ti-17Nb-1Fe. Room temperature aging was observed in both alloys, where the formation of the omega phase increased the yield strength (also SIM onset stress), and decreased the ductility and strain recovery. Other metastable beta Ti alloys may show a similar aging response and this should draw the attention of materials design engineers.

【 授权许可】

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