Al-4.5 Cu-3.8 Fe In Situ Composites: Effect of Rolling on Microstructure and Wear Properties
Al based MMCs have attracted a lot of attention particularly for their desirable combination of high stiffness and low specific gravity. In the present study, Al-4.5Cu-3.8Fe in-situ composites were manufactured by using solidification process. During solidification Al-Fe intermetallic was formed in a matrix of Al-Cu alloy. The composite was hot rolled at different degree using a two high rolling mill. Subsequently the composites were characterized by SEM, XRD, hardness measurement and wear testing. Wear testing was conducted on a pin-on-disk machine by applying 10 KN load. After the wear tests, the worn surfaces of the composite specimens were examined under an optical microscope. According to experimental results, as cast in-situ composites exhibited the highest wear rate. The hardness increased and wear rate decreased with the extent of rolling. The presence of reinforcing Al3Fe phase and fragmentation of those particles during hot rolling are suggested to contribute to the better wear resistance of the composites. The extent of abrasive wear was largest in the case of as cast composites, as evidenced by deep grooves on the worn surface and highest weight loss.
M.S.J. Hashmi, S. Mridha and S. Naher
S.K. Shaha et al., "Al-4.5 Cu-3.8 Fe In Situ Composites: Effect of Rolling on Microstructure and Wear Properties", Advanced Materials Research, Vols. 264-265, pp. 1939-1943, 2011