Comparison of the effects of Mg and Zn on the interface mismatch and compression properties of 50 vol% TiB2/Al composites. Issue 15 (1st August 2021)

• Record Type: Journal Article
• Authors: Yang, Hong-Yu; Cai, Zhong-Jie; Zhang, Qun; Shao, Yong; Dong, Bai-Xin; Xuan, Qian-Qian; Qiu, Feng
• Is Part Of: Ceramics international. Volume 47:Issue 15(2021)
• Page Start: 22121
• Page End: 22129
• Publication Date: 2021-08-01
• Subjects: Composites -- Matrix alloying -- Interface mismatch -- Microstructures -- Compression properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.04.234
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Low ductility limits the extensive application of high volume fraction (>30 vol%) ceramic particle-reinforced metal matrix composites, and the simultaneous improvement of strength and ductility is still a challenge owing to the smaller amount of matrix contained in such composites. In this paper, the effects of various contents of Mg or Zn (0, 6, 10 and 14 wt%) on the interface mismatch and compression properties of 50 vol% TiB2 /Al composite fabricated in situ are comparatively studied. The results indicate that Mg has a better refinement effect than Zn on the TiB2 ceramic particles. Mg can reduce the crystallographic mismatch degree of the Al/TiB2 interface. 6 wt% Mg simultaneously increases the σ 0.2, σ UCS and ε f of the composite into 780 MPa, 1162 MPa and 10.68%, compared with the composite without the addition of Mg, increasing 8.5%, 2.8% and 30.6%, respectively. However, the addition of Zn leads to serious distortion of the Al lattice and deteriorates the interface matching degree of Al/TiB2, so the addition of Zn generally improves the σ 0.2 and σ UCS while sacrifices the plasticity simultaneously. Furthermore, the contributions of various strengthening mechanisms of the matrix in the high volume fraction TiB2 /Al composites are analyzed through a comparative study.