Microstructure, mechanical properties and fracture behavior of 6061 aluminium alloy-based nanocomposite castings fabricated by ultrasonic processing. (2nd September 2016)

• Record Type: Journal Article
• Authors: Jia, Shian; Xuan, Yang; Nastac, Laurentiu; Allison, Paul G.; Rushing, Timothy W.
• Is Part Of: International journal of cast metals research. Volume 29:Number 5(2016)
• Page Start: 286
• Page End: 289
• Publication Date: 2016-09-02
• Subjects: Ultrasonic stirring technology -- 6061 alloy -- Microstructure -- Mechanical property -- Fracture behaviour -- Metal matrix nanocomposite; Metal castings -- Periodicals; Founding -- Periodicals; Foundry research -- Periodicals; Foundry chemistry -- Periodicals; 671.2
• DOI: 10.1080/13640461.2016.1181232
• Languages: English
• ISSNs: 1364-0461

Abstract

Abstract : It has been revealed that microstructure and mechanical properties of aluminium castings can be significantly improved by adding nanoparticles as reinforcement to fabricate aluminium-based metal matrix nanocomposites (MMNCs). One of the common problems in fabricating MMNCs is the agglomeration of reinforcement nanoparticles. In the present study, ultrasonic stirring technology (UST) is deployed to assist 6061 nanocomposite casting process by promoting the dispersion and deagglomeration. Al2 O3 /SiC nanoparticles are used as reinforcement materials. Nanoparticles are added into the molten alloy and dispersed by ultrasonic cavitation and acoustic streaming caused by UST. The microstructure, fracture behaviour and mechanical properties of 6061-based MMNC samples have been investigated. Tensile strength and yield strength of MMNC samples remain at the same level while the elongation increases significantly compared to reference samples.