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Experimental and theoretical analyse...

Jia, Shian.

Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites.
Author:	Jia, Shian.
Description:	92 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
Notes:	Adviser: Laurentiu Nastac.
Contained By:	Dissertation Abstracts International77-02B(E).
Subject:	Materials science.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3726083
ISBN:	9781339106519

Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites.
Jia, Shian.

Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites. - 92 p.

Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.

Thesis (Ph.D.)--The University of Alabama, 2015.

Strong evidence is showing that microstructure and mechanical properties of a casting component can be significantly improved if nanoparticles are used as reinforcement to form metal-matrix-nano-composite (MMNC). In this paper, 6061/A356 nanocomposite castings are fabricated using the ultrasonic stirring technology (UST). The 6061/A356 alloy and Al2O3/SiC nanoparticles are used as the matrix alloy and the reinforcement, respectively. Nanoparticles are injected into the molten metal and dispersed by ultrasonic cavitation and acoustic streaming. The applied UST parameters in the current experiments are used to validate a recently developed multiphase Computational Fluid Dynamics (CFD) model, which is used to model the nanoparticle dispersion during UST processing. The CFD model accounts for turbulent fluid flow, heat transfer and the complex interaction between the molten alloy and nanoparticles using the ANSYS Fluent Dense Discrete Phase Model (DDPM). The modeling study includes the effects of ultrasonic probe location and the initial location where the nanoparticles are injected into the molten alloy.

ISBN: 9781339106519Subjects--Topical Terms:

221779
Materials science.

Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites.
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245 1 0 $a Experimental and theoretical analyses on the ultrasonic cavitation processing of Al-based alloys and nanocomposites.
300 $a 92 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
500 $a Adviser: Laurentiu Nastac.
502 $a Thesis (Ph.D.)--The University of Alabama, 2015.
520 $a Strong evidence is showing that microstructure and mechanical properties of a casting component can be significantly improved if nanoparticles are used as reinforcement to form metal-matrix-nano-composite (MMNC). In this paper, 6061/A356 nanocomposite castings are fabricated using the ultrasonic stirring technology (UST). The 6061/A356 alloy and Al2O3/SiC nanoparticles are used as the matrix alloy and the reinforcement, respectively. Nanoparticles are injected into the molten metal and dispersed by ultrasonic cavitation and acoustic streaming. The applied UST parameters in the current experiments are used to validate a recently developed multiphase Computational Fluid Dynamics (CFD) model, which is used to model the nanoparticle dispersion during UST processing. The CFD model accounts for turbulent fluid flow, heat transfer and the complex interaction between the molten alloy and nanoparticles using the ANSYS Fluent Dense Discrete Phase Model (DDPM). The modeling study includes the effects of ultrasonic probe location and the initial location where the nanoparticles are injected into the molten alloy.
520 $a The microstructure, mechanical behavior and mechanical properties of the nanocomposite castings have been also investigated in detail. The current experimental results show that the tensile strength and elongation of the as-cast nanocomposite samples (6061/A356 alloy reinforced by Al2O 3 or SiC nanoparticles) are improved. The addition of the Al2O 3 or SiC nanoparticles in 6061/A356 alloy matrix changes the fracture mechanism from brittle dominated to ductile dominated.
590 $a School code: 0004.
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710 2 $a The University of Alabama. $b Metallurgical/Materials Engineering. $3 730424
773 0 $t Dissertation Abstracts International $g 77-02B(E).
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791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3726083