New role of <b>α</b> phase in the fracture behavior and fracture toughness of a <b>β</b>-type bio-titanium alloy

Ran Wang; Xiu Song; Lei Wang; Yang Liu; Mitsuo Niinomi; Deliang Zhang; Jun Cheng

doi:10.1007/s12613-023-2635-4

Volume 30 Issue 9

Sep. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(9): 1756-1763

Ran Wang, Xiu Song, Lei Wang, Yang Liu, Mitsuo Niinomi, Deliang Zhang, and Jun Cheng, New role of α phase in the fracture behavior and fracture toughness of a β-type bio-titanium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1756-1763. https://doi.org/10.1007/s12613-023-2635-4

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Ran Wang, Xiu Song, Lei Wang, Yang Liu, Mitsuo Niinomi, Deliang Zhang, and Jun Cheng, New role of α phase in the fracture behavior and fracture toughness of a β-type bio-titanium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1756-1763. https://doi.org/10.1007/s12613-023-2635-4

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Research Article

New role of α phase in the fracture behavior and fracture toughness of a β-type bio-titanium alloy

+ Author Affiliations

Corresponding authors:
Xiu Song E-mail: wanglei@mail.neu.edu.cn

Lei Wang E-mail: songxiu@mail.neu.edu.cn
Received: 12 December 2022; Revised: 23 March 2023; Accepted: 27 March 2023; Available online: 30 March 2023

Abstract

Abstract

The role of α precipitates formed during aging in the fracture toughness and fracture behavior of β-type bio-titanium alloy Ti–29Nb–13Ta–4.6Zr (TNTZ) was studied. Results showed that the fracture toughness of the TNTZ alloy aged at 723 K decreases to the minimum of 72.07–73.19 kJ·m⁻² when the aging time is extended to 4–8 h and then gradually increases and reaches 144.89 kJ·m⁻² after 72 h. The decrease in fracture toughness within the aging time of 4–8 h is caused by the large stress concentration at the tip of acicular α precipitates with a high aspect ratio and the preferential crack propagation along the inhomogeneous acicular α precipitates distributed in “V-shape” and “nearly perpendicular shape”. When the aging time is extended to 8–72 h, the precrack tip is uniformly blunted, and the crack is effectively deflected by α precipitates with multi long axis directions, more high homogeneity, low aspect ratio, and large number density. Analysis of the effect of α precipitates on the fracture behavior suggested that the number of long axis directions of α precipitates is the key controlling factor for the fracture behavior and fracture toughness of the TNTZ alloy aged for different times.
- fracture toughness;
- Ti–29Nb–13Ta–4.6Zr alloy;
- aged α phase;
- crack tip blunting

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