Damage mechanisms of a metastable β-titanium alloy with bimodal microstructure revealed by void growth models using synchrotron X-ray microtomography

IF 11 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-11-13 DOI:10.1007/s12598-024-03029-5

Bin Gu, Jérôme Adrien, Eric Maire, Ning Dang, Werner Skrotzki

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Abstract

In order to investigate the damage tolerance of a metastable Ti-5Al-3V-3Mo-2Cr-2Zr-1Nb-1Fe (Ti5321) alloy with bimodal microstructure using void growth quantification and micromechanical modeling, in situ tensile testing was performed during X-ray microtomography experiments. Compared with investigations of surface voids by traditional two-dimensional (2D) methods involving post-mortem characterization, three-dimensional (3D) information on void evolution inside optically opaque samples obtained through X-ray microtomography is essential. The Rice and Tracey model and Huang model were applied to predict void growth and show good agreement with experimental data using calibration of the damage parameter α. The void growth kinetics of Ti5321 with bimodal microstructure was analyzed by comparing the α value with that of Ti64 for different microstructure morphologies. The damage mechanism of ductile fracture of Ti5321 with bimodal microstructure is discussed. It was found that the size of the voids apparently increases with the triaxiality of stress. Post-mortem scanning electron microscopy (SEM) was also used to demonstrate this damage mechanism of ductile fracture of Ti5321.

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利用同步辐射 X 射线显微层析成像技术，通过空隙生长模型揭示具有双峰微观结构的可代谢 β 钛合金的损伤机理

为了利用空隙生长量化和微机械建模研究具有双峰微观结构的钛-5Al-3V-3Mo-2Cr-2Zr-1Nb-1Fe（Ti5321）合金的损伤耐受性，在 X 射线显微层析成像实验中进行了原位拉伸测试。与采用传统的二维（2D）方法（包括死后表征）对表面空隙进行研究相比，通过 X 射线显微层析成像技术获得光学不透明样品内部空隙演变的三维（3D）信息至关重要。应用 Rice and Tracey 模型和 Huang 模型预测了空洞的增长，并通过校准损伤参数 α 显示出与实验数据的良好一致性。通过将不同微观结构形态下的 α 值与 Ti64 的 α 值进行比较，分析了具有双峰微观结构的 Ti5321 的空洞增长动力学。讨论了具有双峰微观结构的 Ti5321 发生韧性断裂的损伤机理。研究发现，空隙的大小明显随着应力的三轴性而增大。研究还利用死后扫描电子显微镜（SEM）来证明 Ti5321 韧性断裂的这一破坏机制。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.