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In-situ SEM characterization of fracture mechanism of TiB/Ti-2Al-6Sn titanium matrix composites after electroshocking treatment

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Abstract

In this article, in-situ scanning electron microscope characterization of the tensile properties of TiB/Ti-2Al-6Sn titanium matrix composite (TMC) was conducted before and after electroshocking treatment (EST). After EST, the tensile strength increased by 113.2 MPa. The effect of EST on the tensile strength and fracture behavior of TiB was investigated using in-situ characterization of the fracture morphology and crack propagation path of the matrix and TiB. Before EST, TiB fracture introduced cracks that extended into the matrix, resulting in material failure. After EST, the refined TiB improved the bearing capacity of the matrix, thereby improving TMC strength. Moreover, after EST, the cracks were introduced into the matrix, and resulting the fracture of matrix first. With an increase in the external load, cracks in the matrix were observed to propagate to TiB, and the refined TiB was fractured, detached, and pulled out, resulting in the formation of pores. Analyzing the propagation path of the main crack after EST showed that the deflection angle of the main crack increased. The microstructure of the fracture surface indicated that the fracture of the matrix was plastic, whereas that of TiB was brittle. After EST, the size and area of the dimples increased, confirming the increase in plasticity. The results revealed that the comprehensive mechanical properties of TiB/Ti-2Al-6Sn improved after EST. Hence, EST is an efficient method for tailoring the microstructures and mechanical properties of TMCs.

Graphical abstract

摘要

本文采用原位扫描电子显微镜 (SEM) 对TiB/Ti-2Al-6Sn钛基复合材料 (TMC) 在电冲击处理 (EST) 前后的拉伸性能进行了原位表征。EST后, 拉伸强度提高了113.2 MPa。通过原位表征基体和TiB的断裂形态和裂纹扩展路径, 研究了EST对TiB抗拉强度和断裂行为的影响。在EST之前, TiB断裂引入裂纹并扩展到基体中, 导致材料失效。EST后, 细化后的TiB提高了基体的承载能力, 从而提高了TMC强度。EST后, 在原位拉伸中基体引入裂纹, 首先导致基体增强体界面开裂。随着外部载荷的增加, 裂纹向TiB扩展, 细化的TiB开始断裂、脱粘并拔出, 导致孔隙的形成。对EST后主裂纹扩展路径的分析表明, 主裂纹的偏转角增大。断裂表面的微观结构表明, 基体的为塑性断裂, 而TiB为脆性断裂。EST后韧窝的尺寸和面积增加, 塑性提高。结果表明, EST后, TiB/Ti-2Al-6Sn的综合力学性能得到改善。因此, EST是一种调控TMCs微观结构和力学性能的有效方法。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52271135), the Major Research Plan of the National Natural Science Foundation of China (No. 92266102), the Natural Science Foundation of Hubei Province (No. 2022CFB492), the Knowledge Innovation Program of Wuhan-Basic Research (No. 2022010801010174), the Application Foundation Frontier Project of Wuhan (No. 2020010601012171), “Chu Tian Scholar” Project of Hubei Province (No. CTXZ2017-05), the Overseas Expertise Introduction Project for Discipline Innovation (No. B17034) and the Innovative Research Team Development Program of Ministry of Education of China (No. IRT_17R83).

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  1. Ya-Ya Wu and Jian Zhou have contributed equally to this work.

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  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Ya-Ya Wu, Jian Zhou, Yan Wen, Zhou Wang, Le-Chun Xie & Lin Hua

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan, 430070, China

    Ya-Ya Wu, Jian Zhou, Yan Wen, Zhou Wang, Le-Chun Xie & Lin Hua

  3. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

    Guo-Lei Han

  4. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Li-Qiang Wang & Wei-Jie Lv

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Wu, YY., Zhou, J., Han, GL. et al. In-situ SEM characterization of fracture mechanism of TiB/Ti-2Al-6Sn titanium matrix composites after electroshocking treatment. Rare Met. 43, 2805–2818 (2024). https://doi.org/10.1007/s12598-023-02614-4

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