Fundamental studies on ultrasonic cavitation-assisted molten metal processing of A356-nanocomposites

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dc.contributor Nastac, Laurentiu
dc.contributor El-Kaddah, N.
dc.contributor Weaver, Mark Lovell
dc.contributor Jordon, J. Brian
dc.contributor.advisor Nastac, Laurentiu Liu, Xiaoda
dc.contributor.other University of Alabama Tuscaloosa 2017-03-01T16:48:00Z 2017-03-01T16:48:00Z 2013
dc.identifier.other u0015_0000001_0001268
dc.identifier.other Liu_alatus_0004M_11488
dc.description Electronic Thesis or Dissertation en_US
dc.description.abstract The usage of lightweight high-performance components is expected to increase significantly as automotive, military and aerospace industries are required to improve the energy efficiency and the performance of their products. A356, which is much lighter than steel, is an attractive replacement material. Therefore, it is of great interest to enhance its properties. There is strong evidence that the microstructure and mechanical properties can be considerably improved if nanoparticles are used as reinforcement to form metal-matrix-nano-composite (MMNC). Several recent studies revealed that ultrasonic vibration is highly efficient in dispersing nanoparticles into the melt and producing MMNC. In this thesis, a detailed analysis of the microstructure and mechanical properties is provided for an A356 alloy enhanced with Al2O3 and SiC nanoparticles via ultrasonic processing. Each type of the nanoparticles was inserted into the A356 molten metal and dispersed by ultrasonic cavitation and acoustic streaming technology (UST) to avoid agglomeration or coalescence. The results showed that microstructures were greatly refined and with the addition of nanoparticles, tensile strength, yield strength and elongation increased significantly. SEM and EDS analyses were also performed to analyze the dispersion of nanoparticles in the A356 matrix. Since the ultrasonic energy is concentrated in a small region under the ultrasonic probe, it is difficult to ensure proper cavitation and acoustic streaming for efficient dispersion of the nanoparticles (especially in larger UST systems) without to determine the suitable ultrasonic parameters via modeling and simulation. Accordingly, another goal of this thesis was to develop well-controlled UST experiments that can be used in the development and validation of a recently developed UST modeling and simulation tool. en_US
dc.format.extent 68 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated. en_US
dc.subject Materials science
dc.title Fundamental studies on ultrasonic cavitation-assisted molten metal processing of A356-nanocomposites en_US
dc.type thesis
dc.type text University of Alabama. Department of Metallurgical and Materials Engineering Metallurgical/Materials Engineering The University of Alabama master's M.S.

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