Nanostructured Al/SiC-Graphite Composites Produced by Accumulative Roll Bonding: Role of Graphite on Microstructure, Wea
- PDF / 4,366,955 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 5 Downloads / 243 Views
JMEPEG DOI: 10.1007/s11665-017-2608-8
Nanostructured Al/SiC-Graphite Composites Produced by Accumulative Roll Bonding: Role of Graphite on Microstructure, Wear and Tensile Behavior M. Reihanian
, S. Fayezipour, and S.M. Lari Baghal
(Submitted September 8, 2016; in revised form February 25, 2017) Nanostructured Al/SiC composite was fabricated by accumulative roll bonding (ARB). The effect of Gr, as the soft and second reinforcing particle, on the microstructure and deformation behavior of Al/SiC composite was examined. After eight ARB cycles, a homogeneous ultra-fine grained structure with the average grain size of about 710 nm was obtained in the Al/SiC composite. Results showed that Gr could not affect the particle distribution. However, the bonding quality between the layers reduced and the mechanical properties of the composite deteriorated considerably with increasing the Gr content. Compared with the Gr-free composite, the Al/SiC-Gr hybrid composite with the highest Gr content exhibited the lowest bonding quality and the lowest tensile strength. Tensile fracture surface of the composites showed that the number of delaminated layers was increased by increasing the Gr content. The best wear resistance was obtained in the composite whose powder mixture contained 80 SiC and 20 Gr (in wt.%). Keywords
accumulative roll bonding (ARB), metal matrix composite (MMC), microstructure, tensile behavior, wear
1. Introduction The request for specific material properties such as low weight and high specific strength has attracted the interest of the research community into the development of metal matrix composites (MMCs) (Ref 1). Among many types of MMCs, Al-based MMCs such as Al/SiC composites are considered as effective materials for cylinder heads, pistons and brake disks in automobile industry (Ref 2). Accordingly, the wear characteristic of Al-based composites reinforced with ceramic particles has attracted considerable attention (Ref 3). It has been reported that ceramic particles (such as SiC particles) reduce the wear rate of the composite material (Ref 4). However, under certain conditions, the presence of a hard, brittle and abrasive phase causes the machinability of the composite to be degraded (Ref 5). The addition of lubricating materials such as graphite as the second reinforcement can improve the wear performance of the hybrid composite (Ref 6). The ceramic particles provide the strength, while the lubricating particles improve the wear performance of the composite. Generally, the presence of graphite particles affects the mechanical properties of Al/SiC composites and limits their industrial applications (Ref 7). This motivates researchers to find a new composite material with better performance and to develop a new processing route for composite manufacturing. The conventional methods for production of Al/SiC-Gr hybrid composites are squeeze casting
M. Reihanian, S. Fayezipour, and S.M. Lari Baghal, Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz,
Data Loading...
