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Article

Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture

by
Ningbo Zhang
1,2,†,
Boyu Ju
2,*,†,
Taiqing Deng
1,
Sen Fu
3,
Cungao Duan
3,
Yiwei Song
4,
Yijun Jiang
4,
Qin Shen
4,
Caogen Yao
1,
Mingda Liu
5,
Ping Wu
6,7,*,
Ziyang Xiu
2,* and
Wenshu Yang
2,*
1
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
2
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3
Shanghai Radio Equipment Research Institute, Shanghai 200050, China
4
Shanghai Research Institute of Radio Equipment, Shanghai 200090, China
5
CASIC Space Engineering Development Co., Ltd., Xinzhou 431400, China
6
Key Laboratory of Advanced Science and Technology on High Power Microwave, Xi’an 710024, China
7
Northwest Institute of Nuclear Technology, Xi’an 710024, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Materials 2022, 15(24), 9070; https://doi.org/10.3390/ma15249070
Submission received: 28 November 2022 / Revised: 16 December 2022 / Accepted: 16 December 2022 / Published: 19 December 2022
(This article belongs to the Special Issue Study on Advanced Metal Matrix Composites)
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Abstract

The mechanical properties of (Ti, Nb)B/Ti2AlNb composites were expected to improve further by utilizing spark plasma sintering (SPS) and inducing the novel three-dimensional network architecture. In this study, (Ti, Nb)B/Ti2AlNb composites with the novel architecture were successfully fabricated by ball milling the LaB6 and Ti2AlNb mixed powders and subsequent SPS consolidation. The influence of the (Ti, Nb)B content on the microstructure and mechanical properties of the composites was revealed by using the scanning electron microscope (SEM), transmission electron microscopy (TEM) and electronic universal testing machine. The microstructural characterization demonstrated that the boride crystallized into a B27 structure and the α2-precipitated amount increased with the (Ti, Nb)B increasing. When the (Ti, Nb)B content reached 4.9 vol%, both the α2 and reinforcement exhibited a continuous distribution along the prior particle boundaries (PPBs). The tensile test displayed that the tensile strength of the composites presented an increasing trend with the increasing (Ti, Nb)B content followed by a decreasing trend. The composite with a 3.2 vol% reinforcement had the optimal mechanical properties; the yield strengths of the composite at 25 and 650 °C were 998.3 and 774.9 MPa, showing an 11.8% and 9.2% improvement when compared with the Ti2AlNb-based alloy. Overall, (Ti, Nb)B possessed an excellent strengthening effect and inhibited the strength weakening of the PPBs area at high temperatures; the reinforcement content mainly affected the mechanical properties of the (Ti, Nb)B/Ti2AlNb composites by altering the α2-precipitated amount and the morphology of (Ti, Nb)B in the PPBs area. Both the continuous precipitation of the brittle α2 phase and the agglomeration of the (Ti, Nb)B reinforcement dramatically deteriorated the mechanical properties.
Keywords: metal-matrix composites; Ti2AlNb; microstructure; mechanical properties; TiB short fiber metal-matrix composites; Ti2AlNb; microstructure; mechanical properties; TiB short fiber

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MDPI and ACS Style

Zhang, N.; Ju, B.; Deng, T.; Fu, S.; Duan, C.; Song, Y.; Jiang, Y.; Shen, Q.; Yao, C.; Liu, M.; et al. Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture. Materials 2022, 15, 9070. https://doi.org/10.3390/ma15249070

AMA Style

Zhang N, Ju B, Deng T, Fu S, Duan C, Song Y, Jiang Y, Shen Q, Yao C, Liu M, et al. Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture. Materials. 2022; 15(24):9070. https://doi.org/10.3390/ma15249070

Chicago/Turabian Style

Zhang, Ningbo, Boyu Ju, Taiqing Deng, Sen Fu, Cungao Duan, Yiwei Song, Yijun Jiang, Qin Shen, Caogen Yao, Mingda Liu, and et al. 2022. "Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture" Materials 15, no. 24: 9070. https://doi.org/10.3390/ma15249070

APA Style

Zhang, N., Ju, B., Deng, T., Fu, S., Duan, C., Song, Y., Jiang, Y., Shen, Q., Yao, C., Liu, M., Wu, P., Xiu, Z., & Yang, W. (2022). Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture. Materials, 15(24), 9070. https://doi.org/10.3390/ma15249070

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