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Thermodynamic modeling and experimental investigation of the Mg-Al-Ca-Sr system

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Thermodynamic modeling and experimental investigation of the Mg-Al-Ca-Sr system

Aljarrah, Mohammad (2008) Thermodynamic modeling and experimental investigation of the Mg-Al-Ca-Sr system. PhD thesis, Concordia University.

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Abstract

In this work, a self-consistent thermodynamic database for the Mg-Al-Ca-Sr system using the modified quasichemical model has been constructed. The thermodynamic description of the quaternary system was established by combining the thermodynamic descriptions of the constituent binary and ternary sub-systems. The Mg-Al-Ca and Mg-Al-Sr systems were investigated by combining thermodynamic modeling and experimental investigation. The experimental investigation has been performed using DSC, XRD, SEM and EPMA. Also, isothermal sections at 300°C and 400°C were constructed for the Mg-Al-Ca and Mg-Al-Sr systems. In the Mg-Al-Sr system, six ternary solubilities of the binary compounds extended into the ternary system have been found and denoted as (Mg 17 Sr 2 ), (Mg 23 Sr 6 ), (Mg 38 Sr 9 ), (Mg 2 Sr), (Al 4 Sr) and (Al 2 Sr). The reported ternary compound in the literature (Mg 58 Al 38 Sr 4 ) has been observed in this work. In the Mg-Al-Ca system, three binary compounds were found to dissolve the third component in the ternary system and were denoted as (Al 2 Ca), (Al 3 Ca 8 ), and (Mg 2 Ca). The ternary compound (C36) reported in the literature has been confirmed. A comparison between the calculated liquidus projection of the Mg-Ca-Sr system using the modified quasichemical model and random solution model has been presented. It was found that while the random solution model agrees well with the experimental phase diagram, the modified quasichemical model gives better agreement with the experimental thermodynamic data and the experimental phase diagram. Liquidus projection of the Al-Ca-Sr system was calculated using the modified quasichemical model and combined with the other three ternaries in one database for the Mg-Al-Ca-Sr system.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (PhD)
Authors:Aljarrah, Mohammad
Pagination:xxii, 216 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:Ph. D.
Program:Mechanical and Industrial Engineering
Date:2008
Thesis Supervisor(s):Medraj, Mamoun
ID Code:975881
Deposited By: Concordia University Library
Deposited On:22 Jan 2013 16:16
Last Modified:18 Jan 2018 17:41
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