Effect of Combined Addition of Trace Sc and Zr Elements on Mechanical Properties and Corrosion Behavior of B4C/7075Al Composite

HAN Huimin, JIANG Longtao, CHAO Zhenlong, HAN Bingzhuo, WANG Chunyu

doi:10.16577/j.issn.1001-1560.2024.0076

2024 , Vol. 57 >Issue 4: 36 - 46

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0076

Effect of Combined Addition of Trace Sc and Zr Elements on Mechanical Properties and Corrosion Behavior of B₄C/7075Al Composite

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(1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China)

JIANG Longtao(1973-), Ph.D., Professor, Research Focus: Basic Theory and Application of Particle-Reinforced Metal Matrix Composites, Tel.: 18845610821, E-mail: longtaojiang@163.com;
CHAO Zhenlong(1994-), Ph.D., Associate Professor, Research Focus: Metal Matrix Composites for Armor, Tel.: 15304503033, E-mail: chaozhenlong@hit.edu.cn

Received date: 2023-08-05

Revised date: 2023-10-10

Accepted date: 2023-10-20

Online published: 2024-04-30

Supported by

National Natural Science Foundation of China (No. 52101172)

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Abstract

The key to restrict the engineering application of high-strength B₄C/Al composites is corrosion, and adding trace alloying elements is an effective measure to improve corrosion resistance. In this work, the B₄C/7075 and B₄C/7075-0.15Sc-0.35Zr composite containing trace Sc and Zr elements were prepared by pressure infiltration. The influence of combined addition of Sc and Zr on microstructure, mechanical properties and corrosion behavior of B₄C/7075 composites was investigated by using scanning electron microscopy, transmission electron microscopy, bending performance testing, tensile performance testing, neutral salt spray testing and electrochemical testing. Results showed that adding Sc and Zr elements to B₄C/7075 composites, the higher bending strength and tensile strength values were obtained in B₄C/7075-0.15Sc-0.35Zr. In addition, the corrosion rate and the corrosion current(J_corr) decreased, indicating that the corrosion resistance of B₄C/Al composite increased, which might be caused by that the grain boundary precipitates in the composite material were small and discontinuous after adding Sc and Zr elements, and the precipitate free zone(PFZ) disappeared.

Key words：

B₄C/7075 composite

; Sc; Zr; mechanical properties; corrosion behavior; PFZ

Cite this article

HAN Huimin, JIANG Longtao, CHAO Zhenlong, HAN Bingzhuo, WANG Chunyu . Effect of Combined Addition of Trace Sc and Zr Elements on Mechanical Properties and Corrosion Behavior of B₄C/7075Al Composite[J]. Materials Protection, 2024 , 57(4) : 36 -46 . DOI: 10.16577/j.issn.1001-1560.2024.0076

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