Publication Type : Journal Article
Publisher : Transactions of the Indian Institute of Metals
Source : Transactions of the Indian Institute of Metals, Springer, Volume 72, Number 4, p.1013–1021 (2019)
Url : https://link.springer.com/article/10.1007/s12666-019-01564-9
Keywords : Al–Mg alloy, Grain refinement, Mechanical properties, MgAl2O4, Ultrasonic treatment
Campus : Coimbatore
School : School of Engineering
Department : Mechanical Engineering
Verified : No
Year : 2019
Abstract : Al–4Mg/MgAl2O4 composites were successfully synthesized by the in situ reaction of Al–4Mg alloy melt and H3BO3 precursor in the presence of ultrasonic cavitation field. Ultrasonic-assisted synthesis facilitated generation of ~ 350-nm-sized MgAl2O4 particles. Enhanced reaction along with dispersion of MgAl2O4 was perceived due to the synergetic effect of ultrasonic cavitation. The presence of MgAl2O4 particles resulted in 3–4 times reduction in matrix alloy grain size, and the grain refinement was further enhanced by ultrasonic treatment. Compared to unreinforced alloy, ultrasonicated Al/MgAl2O4 composite exhibited an improvement in ultimate tensile strength by ~ 30 MPa with ~ 85% of ductility retention. Grain boundary strengthening, Orowan dispersion strengthening, coefficient of thermal expansion mismatch strengthening and load-bearing strengthening were the anticipated mechanism for enhancement in mechanical properties.
Cite this Research Publication : R. Raghu, Nampoothiri, J., T. Satish Kumar, and Subramanian, R., “Microstructure and Mechanical Properties of Al/MgAl 2 O 4 In Situ Composites Synthesized by Ultrasonic Cavitation”, Transactions of the Indian Institute of Metals, vol. 72, pp. 1013–1021, 2019.