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Thermodynamic Optimization and calculation of the Mg -Ag - X ( X = Nd , Ca ) system

Author: HuangGuoXing
Tutor: LiuLiBin
School: Central South University
Course: Materials Science
Keywords: Magnesium alloy Calculation of phase diagram Mg - Ag - Nd ternary Mg - Ag - Ca ternary
CLC: TG146.22
Type: Master's thesis
Year: 2008
Downloads: 119
Quote: 0
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Abstract


Magnesium alloy is the lightest metal structural materials in industrial applications , has a density, high specific strength and high stiffness , casting properties, damping properties , machinability , easy to recycle a series of advantages . Excellent mechanical properties , so that the magnesium alloy is especially suitable for lightweight structural parts . But compared with aluminum , magnesium alloy high-temperature strength and creep resistance , which is an important reason to limit magnesium alloy widely used . Therefore, the research has broad application prospects of high - temperature high-strength creep resistant magnesium alloy is particularly important . Method of improving the heat resistance of magnesium alloy by adding alloying elements to strengthen the matrix and grain boundaries , thereby increasing its resistance to high temperature creep properties . Thermodynamic optimization in order to obtain accurate phase diagrams and thermodynamic database of great significance to the development of heat - resistant magnesium alloy , magnesium alloy system . CALPHAD technology to evaluate and optimize the Ag - Nd and Ag - Ca binary system phase diagram , and combined with existing Mg-Ag and Mg - Ca binary system , an extrapolation of the Mg -Ag - Nd and Mg - Ag - Ca two ternary system and the establishment of the thermodynamic database . The main tasks are as follows: 1 . The Thermo - Calc , ? < / Sup > thermodynamic package optimization and calculation of the Ag - Nd and Ag - Ca two binary system . Liquid phase and the end of the occasion the use of alternative solution model , all compounds are stoichiometric ratio type , the calculated phase equilibria and thermodynamic data are in good agreement with the experimental data . ( 2 ) the use of the method of calculation of phase diagram (CALPHAD) , adopt Pandat ? < / Sup > the thermodynamic package extrapolation optimized Mg -Ag - Nd and Mg - Ag - Ca ternary system . MgAg , MgNd two-phase processing an order-disorder phase , two ternary compound is added to the Mg- Ag - Ca system , wherein a compound having a certain solubility . The calculated phase equilibria and thermodynamic data are in good agreement with the experimental data .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Magnesium
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