摘要
利用X射线衍射分析、差热分析以及金相分析等技术测定了Er-Mn-Ti三元系的相组成和相关系。在773K下,该三元系存在Mn_(15)Ti_(85),αMnTi,βMnTi,Mn_2Ti,Mn_5Ti,ErMn_(12),Er_6Mn_(23)和ErMn_2 8个二元化合物。用相消失法并结合点阵常数法确定了773K下,Ti在Mn中的最大固溶度约为8at.%;Mn在Mn_2Ti中的成分范围约为61-69at.%Mn。Er在Mn_2Ti相中的最大固溶度小于1at.%Er。在这个系统中没有观察到三元化合物。根据分析结果,构筑了Er-Mn-Ti三元系合金相图773K等温截面。该等温截面由11个单相区、19个两相区和9个三相区组成。
11个单相区是:α(Er),β(Ti),γ(Mn_(15)Ti_(85)),δ(αMnTi),ε(βMnTi),ζ(Mn_2Ti),η(Mn_5Ti),θ(Mn),ι(ErMn_(12)),κ(Er_6Mn_(23))和λ(ErMn_2)。
19个两相区是:α+β,β+γ,γ+δ,δ+ε,ε+ζ,ζ+η,η+θ,θ+ι,ι+κ,κ+λ,λ+α,α+γ,α+δ,α+ε,α+ζ,ζ+λ,ζ+κ,η+κ和θ+κ。
9个三相区是:α+β+γ,α+γ+δ,α+δ+ε,α+ε+ζ,α+ζ+λ,ζ+κ+λ,ζ+η+κ,η+θ+κ和θ+ι+κ。
The Phase relationship in the Er-Mn-Ti ternary system at 773K has been investigated by X-ray powder diffraction with the aid of differential thermal analysis(DTA)and optical microanalysis techniques in this work.The eight binary compounds Mn_(15)Ti_(85),αMnTi,βMnTi,Mn_2Ti,Mn_5Ti,ErMn_(12),Er_6Mn_(23)and ErMn_2 have been confirmed in this system at 773K.The maximum solid solubility of Ti in Mn is about 8at.%Ti.The homogeneity range of Mn_2Ti extends from about 61at.%to 69at.%Mn.The maximum solid solubility of Er in Mn_2Ti phase is about less than 1at.%Er.No ternary compounds were found in this ternary system.The isothermal section of phase diagram consists of eleven single-phase regions,nineteen two-phase regions and nine three-phase regions.
The eleven single-phase regions are:α(Er),β(Ti),γ(Mn_(15)Ti_(85)),δ(αMnTi),ε(βMnTi),ζ(Mn_2Ti),η(Mn_5Ti),θ(Mn),ι(ErMn_(12)),κ(Er_(6)Mn_(23)), andλ(ErMn_2).
The nineteen two-phase regions are:α+β,β+γ,γ+δ,δ+ε,ε+ζ,ζ+η,η+θ,θ+ι,ι+κ,κ+λ,λ+α,α+γ,α+δ,α+ε,α+ζ,ζ+λ,ζ+κ,η+κandθ+κ.
The nine three-phase regions are:α+β+γ,α+γ+δ,α+δ+ε,α+ε+ζ,α+ζ+λ,ζ+κ+λ,ζ+η+κ,η+θ+κandθ+ι+κ.
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