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Full-Text Articles in Engineering Science and Materials

Effect Of Ultrasonic Treatment On The Microstructure And Mechanical Properties Of Al6061 And Composite, Ana S. Exime Nov 2017

Effect Of Ultrasonic Treatment On The Microstructure And Mechanical Properties Of Al6061 And Composite, Ana S. Exime

FIU Electronic Theses and Dissertations

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 ...


Aluminum/Calcium Deformation Metal-Metal Composites After Conversion To Al2ca Intermetallic Reinforcement, Charles Czahor Jan 2017

Aluminum/Calcium Deformation Metal-Metal Composites After Conversion To Al2ca Intermetallic Reinforcement, Charles Czahor

Graduate Theses and Dissertations

Deformation-processed metal-metal composites (DMMCs) provide an appealing approach for producing lightweight materials with high strength and high conductivity. DMMCs can be produced by powder metallurgy and severe plastic deformation resulting in nano-filamentary reinforcement. Al/Ca composites with monolithic construction have shown promise as next-generation overhead transmission conductors. Previous research has shown that these materials tend to form various intermetallic species when exposed to elevated temperatures resulting in the degradation of properties. This study examines the effect of using a reduced loading of Ca and intentionally converting the reinforcement to an intermetallic species to produce a material with enhanced high-temperature stability ...