【摘要】 用银浴等活度法、蒸气等活度法及碳溶解度法分别测定了 Fe-C-Mn 三元系熔体在1450℃时的等 Mn 活度数据及等C活度（a_C=1）数据。计算得到 Fe-C-Mn 熔体的活度交互作用系数:ε_Mn^C(ε_C^Mn)=-3.7,ρ_Mn^C=-1.4,ρ_C^Mn=-2.8,ρ_Mn^Mn,C=-48.2及ρ_C^C,Mn=2.8.用等活度数据检验 Darken二次式对 Fe-C-Mn 三元系的适用性,指出 a_Mn-C不是常数,且不等于 a_C-Mn。更多还原

【Abstract】 Iso- manganese- activity data in Fe- C- Mn ternary alloys were determined with the common silver bath method and common vapor phasemethod. Iso- carbon- activity （a_C = 1） data were determined with carbonsolubility method at 1450℃. The experimental data are used to esti-mate the activity interaction coefficients of manganese and carbon,and the following results are obtained ε_Mn^C(ε_C^Mn) =-3.7, ρ_Mn^C=-1.4, ρ_C^Mn =-2.8, ρ_Mn^Mn,C=48.2 and ρ_C^C,Mn=2.8 The applicability of Darken’s quadratic formulation is examinedwith the expeimental iso- activity data. It is found that the value ofthe parameter α_Mn-C varied with the activity level of manganese inFe- C- Mn ternary melt, and α_Mn-C is different from α_C-Mn.更多还原