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

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Minerals, Metallurgy, and Materials Pub Date : 2023-08-25 DOI:10.1007/s12613-023-2635-4

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

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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 a precipitates with a high aspect ratio and the preferential crack propagation along the inhomogeneous acicular a 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 a precipitates with multi long axis directions, more high homogeneity, low aspect ratio, and large number density. Analysis of the effect of a precipitates on the fracture behavior suggested that the number of long axis directions of a precipitates is the key controlling factor for the fracture behavior and fracture toughness of the TNTZ alloy aged for different times.

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α相在β型生物钛合金断裂行为和断裂韧性中的新作用

研究了时效过程中α析出物对β型生物钛合金Ti-29Nb-13Ta-4.6Zr (TNTZ)断裂韧性和断裂行为的影响。结果表明,TNTZ合金的断裂韧性的最低年龄在723 K降低72.07 - -73.19 kJ·m−2当老化时间延长至4 - 8 h,然后逐渐增加,达到144.89 kJ·m−2 h。72后的断裂韧性下降4 - 8 h的老化时间内大型尖端的应力集中造成的针状沉淀与高纵横比和非齐次的优惠裂纹扩展针状沉淀呈“v”形和“近垂直”形分布。时效时间延长至8 ~ 72 h时，预裂纹尖端被均匀钝化，裂纹被多长轴方向、均匀性更高、长径比低、数量密度大的析出物有效偏转。分析了析出相对断裂行为的影响，认为析出相长轴方向的数量是不同时效时间下TNTZ合金断裂行为和断裂韧性的关键控制因素。

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来源期刊

International Journal of Minerals, Metallurgy, and Materials 工程技术-材料科学：综合

CiteScore

9.30

自引率

16.70%

发文量

205

审稿时长

2 months

期刊介绍： International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.