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

Document Type

Journal Article




Faculty of Health, Engineering and Science


School of Engineering




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


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.



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