Magnetic contribution to the interdiffusion coefficients in bcc (<Emphasis Type="Italic">α</Emphasis>) and fcc (<Emphasis Type="Italic">γ</Emphasis>) Fe-Ni alloys |
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Authors: | J Yang J I Goldstein |
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Affiliation: | (1) Department of Mechanical and Industrial Engineering, the University of Massachusetts, 01003 Amherst, MA;(2) College of Engineering, the University of Massachusetts, 01003 Amherst, MA |
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Abstract: | The interdiffusion coefficients in bcc (α) and fcc (γ) Fe-Ni alloys below their Curie temperatures have been calculated based on the magnetic contribution to the free energy for
interdiffusion. The free energy for interdiffusion due to magnetic ordering in bcc Fe-Ni alloys is positive. The calculated
interdiffusion coefficients in bcc Fe-Ni alloys fit the experimental data quite well. In fcc Fe-Ni alloys, the magnetic contribution
to interdiffusion depends on both temperature and composition and is abnormal for Ni compositions in the Invar region. The
free energy of vacancy formation is positive and the free energy of vacancy migration is negative, due to the effect of magnetic
ordering. The interdiffusion coefficient in the ferromagnetic phase is lower than that extrapolated from the paramagnetic
phase for Ni compositions of 50 at. pct and greater and is higher than that extrapolated from the paramagnetic phase for Ni
compositions of 40 at. pct and lower. |
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Keywords: | |
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