Abstract
ABSTRACTSiC/Al-4.5Cu and SiO2/Al-4.5Cu nanocomposites were fabricated by semi-solid stirring combined with ultrasonic cavitation and their hot-tearing resistance during casting investigated. The hot-tearing susceptibilities of Al-4.5Cu alloy and its nanocomposites were studied using a constrained rod casting steel mould. The results showed that the extent of hot tearing in the Al-4.5Cu alloys is greatly reduced by the addition of 1 wt% SiC or 1 wt% SiO2 nanoparticles. Microstructural analysis suggested that SiC and SiO2 nanocomposites refined the θ-Al2Cu phases and α-Al dendrites and lead to discontinuous Al2Cu phases along the grain boundaries in the Al-4.5Cu alloys during solidification, which leads to an enhancement on the hot-tearing resistance of Al-4.5Cu to a considerable degree. Moreover, SiO2 nanoparticles have a remarkable effect on the microstructure refinement of the Al-4.5Cu alloys.
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.
