A Comparison of Microstructure, Hardness, and Wear Behavior of Ti matrix Composites Reinforced with in-Situ Reinforcements Synthesized Using TiB2 and B4C

Zibanejad-rad, Alireza; Alizadeh, Ali; Abbasi, Seyyed Mehdi

doi:10.22068/ijmse.3493

Volume 21, Issue 2 (June 2024) IJMSE 2024, 21(2): 1-14 | Back to browse issues page

‎ 10.22068/ijmse.3493

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Zibanejad-rad A, Alizadeh A, Abbasi S M. A Comparison of Microstructure, Hardness, and Wear Behavior of Ti matrix Composites Reinforced with in-Situ Reinforcements Synthesized Using TiB2 and B4C. IJMSE 2024; 21 (2) :1-14
URL: http://ijmse.iust.ac.ir/article-1-3493-en.html

A Comparison of Microstructure, Hardness, and Wear Behavior of Ti matrix Composites Reinforced with in-Situ Reinforcements Synthesized Using TiB2 and B4C

Alireza Zibanejad-rad

, Ali Alizadeh

, Seyyed Mehdi Abbasi

Abstract: (4525 Views)

Pressureless sintering was employed at 1400 °C to synthesize Ti matrix composites (TMCs) reinforced with in-situ TiB and TiC reinforcements using TiB₂ and B₄C initial reinforcements. The microstructure and wear behavior of the synthesized composites were evaluated and compared and the results showed that B₄C caused the formation of TiB-TiC in-situ hybrid reinforcements in the Ti matrix. Also, TiB was in the form of blades/needles and whiskers, and TiC was almost equiaxed. Moreover, the volume fraction of the in-situ formed reinforcement using B₄C was much higher than that formed using TiB₂. In addition, although the hardness of the B₄C-synthesized composites was higher, the composite synthesized using 3 wt.% TiB₂ exhibited the highest hardness (425 HV). The wear test results showed that the sample synthesized using 3 wt.% TiB₂ showed the lowest wear rate at 50 N, mainly because of its higher hardness. The dominant wear mechanism in the samples synthesized using 3 wt.% B₄C was abrasive and delamination at 50 N and 100 N, respectively while in the samples synthesized 3 wt.% TiB₂, a combination of delamination and adhesive wear and adhesive wear was ruling, respectively.

Keywords: Pressureless sintering, Titanium, Composite, Microstructure, Wear