Sliding wear behavior of AZ91/B4C surface composites produced by friction stir processing. (27th January 2020)

• Record Type: Journal Article
• Authors: Patle, Hemendra; Ratna Sunil, B; Dumpala, Ravikumar
• Is Part Of: Materials research express. Volume 7:Number 1(2020)
• Publication Date: 2020-01-27
• Subjects: friction stir processing -- AZ91 Mg alloy -- B4C -- surface composite -- wear mechanism; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab6a55
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: In the present study, the surface of AZ91 Mg alloy was modified by incorporating boron carbide (B4 C) particles using friction stir processing (FSP). Sliding wear behavior of these developed AZ91/B4 C surface composites was investigated against AISI 52100 steel ball using linear reciprocating tribometer. Hardness tests reveal that the hardness of the fabricated surface composite (∼137.47 HV) is significantly increased compared to the base metal (∼95.5 HV) due to the presence of B4 C particles. Wear tests were conducted on the samples at two different sliding velocities; 0.06 m s −1 and 0.12 m s −1 . It was observed that at higher sliding velocity of 0.12 m s −1, AZ91/B4 C surface composite exhibited lower friction coefficient value in comparison to that of the base metal, whereas it is vice versa at the low sliding velocity of 0.06 m s −1 . However, surface composites exhibited superior wear resistance at both the sliding velocities, in comparison to that of the base metal. Scanning electron microscopy and energy-dispersive spectroscopy analysis of the wear tracks were carried out to understand the wear mechanisms. From the observations, a combination of abrasive, adhesive, and oxidative wear mechanisms were found to be prominent.