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It is well known that the magnetic properties such as the Curie temperature T~mag __C and the mean magnetic moment β of ordered compounds have different values from those of the disordered solutions. For instance, both T~mag _c and β of the Ni_3Pt (L1_2) and NiPt (L1_0) and T~mag __c of the CoPt (L1_0) and CoPt_3 (L1_2) ordered compounds are strongly depressed due to the ordering compared with those of the metastable disordered Ni-Pt and Co-Pt alloys. On the other hand, the γ’-FeNi_3 (L1_2) and the α’-FeCo (B2) ordered compounds have higher T~mag __c and β values comparing with the disordered solution phases, γ (A1) and α (A2), respectively. In consequence, the stability of the ordered phase is depressed or enhanced due to the interaction between the chemical and magnetic ordering caused by the decrease or increase of T~mag __c and β values. The purpose of this study is to investigate the effect of the interaction between the chemical and the magnetic ordering on the phase equilibria in the Fe-X(X=Al, Co, Ni, Rh, Si) binary systems.The Gibbs energy of the α(A2), γ(A1) and liquid phases is described by a sub-regular solution approximation. The ordering contribution to the Gibbs energy ,ΔG~order __m, and deviations of magnetic properties, ΔT~mag __c and Δβ, of the ordered compounds, FeAl (B2), Fe_3Al (D03), FeCo (B2), FeRh (B2), FeSi (B2), Fe_3Si (D03) and FeNi_3 (L1_2) is introduced by the split compound energy formalism. Effect of the interaction between the chemical ordering, B2, D0_3 and L1_2 and the magnetic ordering on the phase equilibria will be discussed according to the calculated phase diagrams of the Fe-X binary systems.
It is well known that the magnetic properties such as the Curie temperature T ~ mag __C and the mean magnetic moment β of the ordered compounds have different values from those of the disordered solutions. For instance, both T ~ mag _c and β of the Ni_3Pt ( L1_2) and NiPt (L1_0) and T_mag __c of the CoPt (L1_0) and CoPt_3 (L1_2) ordered compounds are strongly depressed due to the ordering compared with those of the metastable disordered Ni-Pt and Co-Pt alloys. other hand, the γ’-FeNi_3 (L1_2) and the α’-FeCo (B2) ordered compounds have higher T~ mag __c and β values comparing with the disordered solution phases, γ (A1) and α (A2) In consequence, the stability of the ordered phase is depressed or enhanced due to the interaction between the chemical and magnetic ordering caused by the decrease or increase of T ~ mag __c and β values. The purpose of this study is to investigate the effect of the interaction between the chemical and the magnetic ordering on the phase equi libria in the Fe-X (X = Al, Co, Ni, Rh, Si) binary systems. Gibbs energy of α (A2), γ (A1) and liquid phases is described by a sub-regular solution approximation. ΔG ~ order __m, and deviations of magnetic properties, ΔT ~ mag __c and Δβ, of the ordered compounds, FeAl (B2), Fe_3Al (D03), FeCo (B2), FeRh FeSi (B2), Fe3Si (D03) and FeNi3 (L1_2) are introduced by the split compound energy formalism. Effect of the interaction between the chemical ordering, B2, DO_3 and L1_2 and the magnetic ordering on the phase equilibria will be discussed according to the calculated phase diagrams of the Fe-X binary systems.