α相对β型生物钛合金断裂行为和断裂韧性的作用

王冉; 宋秀; 王磊; 刘杨; MitsuoNiinomi; 张德良; 程军

doi:10.1007/s12613-023-2635-4

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文章导航 > 矿物冶金与材料学报（英文） > 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

Cite this article as:

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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研究论文

α相对β型生物钛合金断裂行为和断裂韧性的作用

1)
东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室, 沈阳 110819, 中国
2)
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3)
Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan
4)
Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
5)
西北有色金属研究院陕西省生物医用金属材料重点实验室, 西安 710016, 中国

通讯作者:
宋秀 E-mail: wanglei@mail.neu.edu.cn

王磊 E-mail: songxiu@mail.neu.edu.cn

文章亮点

(1) 系统地研究了针状α相对TNTZ钛合金断裂韧性的影响规律。

(2) TNTZ钛合金断裂行为和断裂韧性的变化与α相特征有关。

(3) TNTZ钛合金断裂行为主要受控于α相长轴不同取向的数量。

中文摘要

Ti–29Nb–13Ta–4.6Zr(TNTZ)具有高比强度、低杨氏模量（接近人体骨组织，约60 GPa）、良好的生物相容性等，有望用于骨科修复、人工假体替换等。然而固溶态TNTZ钛合金的力学性能逊色于Ti–6Al–4V合金。时效处理可提高TNTZ钛合金的强度、但其塑韧性受损，危及医用服役安全。迄今时效α相对TNTZ钛合金断裂行为的影响仍处空白。本文旨在揭示时效α相对合金断裂行为的影响规律及作用机理，为合金的安全服役提供理论依据。为此，本文通过时效处理调控α相的尺寸、形态、分布、含量等特征，通过显微组织观察、断裂韧性测试、断口形貌观察研究了α相特征参量与合金断裂行为及断裂韧性的关系。结果表明，723 K时效，随时间延长，合金断裂韧性先降低后升高；4–8 h降至最低值72.07–73.19 kJ·m⁻²；72 h升至最高值144.89 kJ·m⁻²。时效4–8 h，断裂韧性较低的原因是：大长径比的针状α相尖端应力集中程度高，易于形成微裂纹；网格上呈“V形”或“近似垂直”排列的α相促进裂纹沿α/β相界面优先扩张，使裂尖难以均匀钝化、偏转，裂纹扩张阻力下降。8–72 h，断裂韧性回升的原因是：α相长径比减小，应力集中程度降低；网格上α相长轴方向的种类逐渐增多，呈“三棱锥”排列的α相对裂纹扩张的阻碍增加，使裂尖均匀钝化；α相分布渐趋均匀、数量增多，使裂尖钝化、偏转增加。时效α相对合金断裂行为影响的分析表明，723 K时效态合金的断裂行为主要由网格上α相长轴不同取向的数量控制。

关键词:

Research Article

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

+ Author Affiliations

1)
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2)
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3)
Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan
4)
Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
5)
Shaanxi Key Laboratory of Biomedical Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Lei Wang is the editorial board member for this journal and were not involved in the editorial review or the decision to publish this article. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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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