Ultrahigh strength and large plasticity of nanostructured Ti62Nb12.2Fe13.6Co6.4Al5.8 alloy obtained by selectively controlled micrometer-sized phases

Authors

L. H. Liu
C. Yang
Z. Y. Liu
Laichang Zhang, Edith Cowan UniversityFollow
W. W. Zhang
X. S. Huang
L. J. He
P. J. Li

Document Type

Journal Article

Publication Title

Materials Characterization

Publisher

Elsevier

School

School of Engineering

RAS ID

24004

Comments

Liu, L. H., Yang, C., Liu, Z. Y., Zhang, L. C., Zhang, W. W., Huang, X. S., . . . Li, P. J. (2017). Ultrahigh strength and large plasticity of nanostructured Ti 62 Nb 12.2 Fe 13.6 Co 6.4 Al 5.8 alloy obtained by selectively controlled micrometer-sized phases. Materials Characterization. 124, 260-265. https://doi.org/10.1016/j.matchar.2017.01.009

Abstract

We report that the strength and plasticity of Ti₆₂Nb_12.2Fe_13.6Co_6.4Al_5.8 alloy can be modulated by selectively controlled micron-sized phases, i.e. β-Ti phase and twined (CoFe)Ti₂ phase. It is found that the alloy with micron-sized β-Ti phase embedded in nanostructured matrix possesses lower yield strength but higher ultimate strength relative to the alloy with micron-sized (CoFe)Ti₂ phases. The plastic strain and ultimate strength of the alloy with micron-sized β-Ti phases is as large as 22.1% and 2826 MPa, respectively. The work-hardening exponent n of the alloy with micron-sized β-Ti phase, 0.12, is far greater than 0.008 for the alloy with (CoFe)Ti₂ phase. Such significant and different mechanical properties are attributed to the roles and response of micron sized phases during deformation process.

DOI

10.1016/j.matchar.2017.01.009

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