Theoretical Thermodynamic Analysis and Phase Analysis of AZ91D/Flyash Composites

Hong Chao Chu; Si Rong Yu; Cui Xiang Wang; Qi Lou

doi:10.4028/www.scientific.net/MSF.788.604

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HomeMaterials Science ForumMaterials Science Forum Vol. 788Theoretical Thermodynamic Analysis and Phase...

Theoretical Thermodynamic Analysis and Phase Analysis of AZ91D/Flyash Composites

Abstract:

The thermodynamic calculation is valuable for judging the feasibility of a reaction. In the present paper, the enthalpy change (∆H_R), entropy change (∆S_R) and Gibbs free energy change (∆G_R) among various components in AZ91D Mg alloy-Cenosphere composites (FAC/AZ91D) were calculated. Through the calculation, we obtained the relationships between the Gibbs free energy changes and temperatures. The difficulty degree of every potential reaction could be directly reflected by the correlation curve between the temperature and the Gibbs free energy change. The analysis result provided the theoretical basis for the reaction temperature and the solution treatment temperature of the FAC/AZ91D system. At the same time, the analysis based on the minimum principle of the reaction free energy revealed the final components (MgO, Mg₂Si and MgAl₂O₄), which was partially similar to the result of XRD analysis (MgO, Mg₂Si and Mg₁₇Al₁₂).

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Periodical:

Materials Science Forum (Volume 788)

Pages:

604-607

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.788.604

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Online since:

April 2014

Authors:

Hong Chao Chu, Si Rong Yu*, Cui Xiang Wang, Qi Lou

Keywords:

Composite, FAC/AZ91D, Gibbs Free Energy Change, Thermodynamic Calculation

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