Document Type
Thesis
Degree
Master of Science (MS)
Major/Program
Materials Science and Engineering
First Advisor's Name
Arvind Agarwal
First Advisor's Committee Title
Committee chair
Second Advisor's Name
Benjamin Boesl
Second Advisor's Committee Title
Committee co-chair
Third Advisor's Name
Norma Munroe
Third Advisor's Committee Title
Committee member
Keywords
ultrasonic treatment, cavitation, sonication, microstructure, hardness, dispersion, Aluminum, cast, composite
Date of Defense
11-14-2017
Abstract
In this study, the effect of ultrasonic treatment (UST) parameters such as amplitude, sonication time, and melt temperature on microstructure and microhardness of Al 6061 alloy is evaluated. The effect of UST on the dispersion of tungsten disulfide (WS2) and carbon nanotubes (CNT) as reinforcement particles in Al 6061 during casting is also studied. The cast Al 6061 with UST demonstrated 32% grain size reduction and 8% increase in the microhardness for optimum processing conditions. The cavitation process induced by UST is responsible for the refinement in microstructure and increase of hardness by enhancing the degassing and nucleation process. UST treated 6061 Al alloy demonstrated Hall-Petch relationship for all processing conditions. The UST process also aids in excellent dispersion of WS2 and CNT as reinforcement particles. UST treated WS2 and CNT reinforced Al 6061 composites displayed improved wear resistance as compared to samples without cavitation.
Identifier
FIDC004032
Recommended Citation
Exime, Ana S., "Effect of Ultrasonic Treatment on the microstructure and mechanical properties of Al6061 and composite" (2017). FIU Electronic Theses and Dissertations. 3534.
https://digitalcommons.fiu.edu/etd/3534
Included in
Engineering Mechanics Commons, Mechanical Engineering Commons, Mechanics of Materials Commons, Metallurgy Commons
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