Effect of α″ martensite on the microstructure and mechanical properties of beta-type Ti-Fe-Ta alloys

Document Type

Journal Article

Publisher

Elsevier

Faculty

Faculty of Health, Engineering and Science

School

School of Engineering

RAS ID

19138

Comments

Haghighi, S. E., Lu, H. B., Jian, G. Y., Cao, G. H., Habibi, D., & Zhang, L. C. (2015). Effect of α ″martensite on the microstructure and mechanical properties of beta-type Ti–Fe–Ta alloys. Materials & Design, 76, 47-54. Available here

Abstract

This work aimed to investigate the effect of Fe and Ta contents on the β. →. α″ martensitic transformation as well as the microstructure and mechanical properties of the as-cast designed Ti- xFe- yTa (x= 8, 9, 10. wt% and y= 0, 2, 5, 8, 9, 10. wt%) alloys. The microstructure of all alloys substantially consists of β and α″ phases. However, the addition of more Fe and Ta β-stabilizers to Ti-8Fe alloy reduced the likelihood to form α″ martensite during quenching, hence decreasing the volume fraction of α″ phase and finally reaching 3% in Ti-10Fe-10Ta alloy. The microstructural studies results revealed that except for Ti-8Fe and Ti-9Fe-2Ta, all alloys with high Ta content present a dendritic microstructure. It is noteworthy noting that all alloys possess higher Vickers hardness and compressive yield stress values than those of CP-Ti and Ti-6Al-4V. However, Ti-10Fe-10Ta alloy with the least amount of α″ martensite phase and dominant β phase structure exhibits the lowest elastic modulus and highest plasticity. It was concluded that further decrease in modulus of elasticity can be achieved through stabilizing single β phase by designing composition of Ti-Fe-Ta alloy.

DOI

10.1016/j.matdes.2015.03.028

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