Abstract
Metal matrix composites (MMCs) have been increasedly used in the industries because of their improved properties over those of non-reinforced alloys. High hardness silicon carbide (SiC) particles are commonly used to reinforce the aluminum alloys, but the full application of such MMCs is however cost sensitive because of the high machining cost. This study investigates the machinability of cast and powder-formed aluminum alloys reinforced with SiC particles. Models for tool wear are validated, while the effect of tool materials, particle distribution, and sub-surface damage are studied and compared.Roughing with uncoated tungsten carbide inserts then finishing with polycrystalline diamond tools is the most economical route to machine SiC reinforced MMCs. The cast MMC exhibits higher machinability than that of the powder-formed MMC mainly because of the favourable shape and distribution of the particles, but weakly because of the fabricating processes. Regardless of the cutting tool materials used for machining, cracked SiC particles and debonded matrix-reinforcement interface were found underneath a machined surface. Such machine-induced defects could be a concern when using the MMCs in a critical application.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
