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Microstructure and Mechanical Properties of Aluminum-Cobalt Based Eutectic Alloys.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Microstructure and Mechanical Properties of Aluminum-Cobalt Based Eutectic Alloys./
Author:	Kshirsagar, Aman.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	75 p.
Notes:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30725572
ISBN:	9798380200820

Microstructure and Mechanical Properties of Aluminum-Cobalt Based Eutectic Alloys.
Kshirsagar, Aman.

Microstructure and Mechanical Properties of Aluminum-Cobalt Based Eutectic Alloys. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 75 p.

Source: Masters Abstracts International, Volume: 85-03.

Thesis (M.S.)--University of Cincinnati, 2023.

This item must not be sold to any third party vendors.

Aluminum and its alloys have been researched on a wide scale for different applications due to their unique properties and potential applications in different industries. Though Al-Co system is well-established, it still lacks research in the Al-rich side (<5 wt.% Co) for elevated temperature stability. This study evaluates the effect of Co and Sc additions to pure Al in terms of high temperature stability and improved mechanical properties through an integrated experimental and computational approach. This work has been carried out in the eutectic region which studies the binary Al-0.75 wt.% Co, Al-1 wt.% Co and Al-1.25 wt.% Co and the ternary Al-1 wt.% Co-0.1 wt.% Sc systems.These alloys were first investigated using the Calculation of Phase Diagrams (CALPHAD) methodology to study the phases present and their volume fractions by plotting phase diagrams. Solidification behavior was analyzed through Scheil calculations. Nucleation, growth and coarsening of precipitates was studied using the TC-PRISMA module of Thermo-Calc. The obtained data was then used to compare with experimental results.In the experimental part, these alloys were fabricated by vacuum arc melting (VAM). Cast alloys were heat treated at 300°C from the as-cast condition with different ageing times up to 1500 hours. Optical microscopy, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis were carried out to characterize the alloys, examine the eutectic structure and verify the present phases. Mechanical properties (strength) of the alloy in as-cast and aged conditions were evaluated using Vickers microhardness tests. Obtained data was used to evaluate the high temperature stability of these alloys.Prepared alloys demonstrate different eutectic microstructures depending on the Co content, consisting of hypoeutectic to complete eutectic nature. As per the predictions by Thermo-Calc, presence of Al-Co intermetallic (Al9Co2) was observed for all alloys imaging via SEM in backscattered electron (BSE) mode and confirmed with XRD analysis as well as elemental EDS scans. A ~17% increase in microhardness was observed while increasing the Co content from 0.75 to 1.25 wt.%. Microhardness values remained stable within the limits of error at high temperature (300°C) through longer ageing times, demonstrating microstructural stability at elevated temperatures. Addition of Sc led to significant increase in microhardness through the precipitation of Al3Sc strengthening phase. The microhardness results were compared against data published in literature for Al with other microalloying elements under similar processing conditions to demonstrate stability of the binary Al-Co alloys.

ISBN: 9798380200820Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

Aluminum-cobalt

Microstructure and Mechanical Properties of Aluminum-Cobalt Based Eutectic Alloys.
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500 $a Source: Masters Abstracts International, Volume: 85-03.
500 $a Advisor: Erdeniz, Dinc.
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520 $a Aluminum and its alloys have been researched on a wide scale for different applications due to their unique properties and potential applications in different industries. Though Al-Co system is well-established, it still lacks research in the Al-rich side (<5 wt.% Co) for elevated temperature stability. This study evaluates the effect of Co and Sc additions to pure Al in terms of high temperature stability and improved mechanical properties through an integrated experimental and computational approach. This work has been carried out in the eutectic region which studies the binary Al-0.75 wt.% Co, Al-1 wt.% Co and Al-1.25 wt.% Co and the ternary Al-1 wt.% Co-0.1 wt.% Sc systems.These alloys were first investigated using the Calculation of Phase Diagrams (CALPHAD) methodology to study the phases present and their volume fractions by plotting phase diagrams. Solidification behavior was analyzed through Scheil calculations. Nucleation, growth and coarsening of precipitates was studied using the TC-PRISMA module of Thermo-Calc. The obtained data was then used to compare with experimental results.In the experimental part, these alloys were fabricated by vacuum arc melting (VAM). Cast alloys were heat treated at 300°C from the as-cast condition with different ageing times up to 1500 hours. Optical microscopy, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis were carried out to characterize the alloys, examine the eutectic structure and verify the present phases. Mechanical properties (strength) of the alloy in as-cast and aged conditions were evaluated using Vickers microhardness tests. Obtained data was used to evaluate the high temperature stability of these alloys.Prepared alloys demonstrate different eutectic microstructures depending on the Co content, consisting of hypoeutectic to complete eutectic nature. As per the predictions by Thermo-Calc, presence of Al-Co intermetallic (Al9Co2) was observed for all alloys imaging via SEM in backscattered electron (BSE) mode and confirmed with XRD analysis as well as elemental EDS scans. A ~17% increase in microhardness was observed while increasing the Co content from 0.75 to 1.25 wt.%. Microhardness values remained stable within the limits of error at high temperature (300°C) through longer ageing times, demonstrating microstructural stability at elevated temperatures. Addition of Sc led to significant increase in microhardness through the precipitation of Al3Sc strengthening phase. The microhardness results were compared against data published in literature for Al with other microalloying elements under similar processing conditions to demonstrate stability of the binary Al-Co alloys.
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653 $a Aluminum-cobalt
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