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Experimental Determination and Thermodynamic Calculation of Phase Equilibria in the Fe-Co-(Nb,Zr) Systems

Author: ZhangHuiHong
Tutor: LiuXingJun
School: Xiamen University
Course: Materials Physics and Chemistry
Keywords: Fe-Co -based alloy CALPHAD Phase diagram
CLC: TG131
Type: Master's thesis
Year: 2009
Downloads: 161
Quote: 0
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Abstract


Fe-Co-based alloys due to its excellent soft magnetic properties, good resistance to oxidation and corrosion resistance and excellent mechanical properties and good physiological compatibility, are widely used in the manufacture of soft magnetic materials, high-temperature alloys in Chemistry and Chemical Engineering , energy, aviation, medical, occupies an important position. CALPHAD metal material composition design application, therefore, it is necessary to grasp the phase diagrams and thermodynamic information. This thesis is determined by experiment and thermodynamic calculation in two ways Co-Zr binary system at different temperatures, Fe-Co-Zr and Fe-Co-Nb ternary phase equilibrium within the whole composition range, the following research Co-Zr binary system: (1) the experimental determination of the phase equilibria in the whole composition range between 500 ° C to 1350 ℃, amendments and additions to the Co-Zr binary system experimental information reported. (2) the first experimental determination of the Fe-Co-Zr ternary system at 1300 ° C, 1200 ° C and 1100 ℃, the whole composition range isothermal section of the phase diagram and ternary Fe-Co-Zr have been reported in 1000 ℃ isothermal section of the phase diagram of the amended and supplemented. (3) The first experimental determination of Fe-Co-Nb ternary system at 1300 ℃, 1200 ° C, 1100 ° C isothermal section of the phase diagram of the whole composition range of 800 ° C and 700 ° C, and has been reported in the Fe-Co -Nb ternary phase diagram at 1000 ℃ and 900 ℃ isothermal section was amended and supplemented. (4) combined with the experimental results of this study to systematically collect, collate and evaluate existing thermodynamic and phase diagram data, reasonable thermodynamic model using CALPHAD Technical Co-Zr binary system, Fe-Co-Zr and Fe -Co-Nb ternary phase equilibrium thermodynamic optimization calculations. (5) In this study, combined with phase equilibrium calculations were designed Ni 57.4 the Nb 26.97-x Ti 15.63 Zr, Co y Ni 57.4-y Nb 23.97 Ti 15.63 Zr 3 , Fe x Ni 57.4-x Nb 23.97 Ti 15.63 Zr 3 , Fe z Co < sub> z Ni 57.4-2z Nb 23.97 Ti 15.63 Zr 3 more than one system of non- the crystalline alloy composition, initial exploration phase diagram in iron-based amorphous material composition design applications. Phase equilibrium experimental results obtained in this study, as well as optimization of the thermodynamic parameters obtained will serve as an important part of the high-performance Fe-based amorphous alloy thermodynamic database, at the same time, the findings will be of high-temperature alloys and Fe-based amorphous alloy composition design and preparation provide important theoretical basis.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Alloy theory
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