Nanoindentation study of mechanical and wear properties of spark plasma sintered Ti-6Ni-xTiCN composites. Issue 2 (15th January 2023)

• Record Type: Journal Article
• Authors: Rominiyi, Azeez Lawan; Mashinini, Peter Madindwa
• Is Part Of: Ceramics international. Volume 49:Issue 2(2023)
• Page Start: 2194
• Page End: 2203
• Publication Date: 2023-01-15
• Subjects: Spark plasma sintering -- Nanomechanical properties -- Anti-wear characteristics -- Ti-6Ni-xTiCN composites -- In-situ TiN -- Ti2Ni intermetallic; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.09.186
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, monolithic pure Ti and Ti-6Ni-xTiCN composites were fabricated by the spark plasma sintering method and the mechanical and anti-wear characteristics of the fabricated samples were investigated using the nanoindentation technique. Microstructural and phase analysis of the sintered samples showed the predominance of the α-Ti phase in the unreinforced pure Ti matrix. In addition to the α-Ti phase, in-situ TiN, Ti2 Ni intermetallic, and undissolved TiCN phases were detected in the matrix of the composites. Nanoindentation results revealed that the hardness (H), elastic modulus (E r ) and elastic recovery index ( W e / W t ) of the investigated samples increase with increasing reinforcement contents under varying loads of 50 mN, 100 mN and 150 mN. The nanomechanical and anti-wear properties of the analysed samples indicated dependency on the applied indentation load. The Ti-6Ni-xTiCN composites displayed higher H / E r, H 3 / E r 2 and W e / W t ratios that signified better wear and impact resistance than the unreinforced pure Ti. Microstructural integrity, which ensures consistency between the anti-wear characteristics obtained through the nanoindentation technique and the conventional wear testing, was achieved in composites containing TiCN nanoceramic contents up to 10 wt%. Ti-6Ni-10TiCN composite displayed the optimum combination of the nanomechanical and anti-wear properties across the applied loads.