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为了控制细小的L10-FePt纳米相均匀分布在非磁性基体中,有必要对Fe-Pt-X系的相图进行系统研究.通过合金法和扩散偶法,利用X射线衍射(XRD)、扫描电镜及能谱成分(SEM-EDS)分析确定了Fe-Pt-Au三元系950℃富Fe角处相平衡关系及各相平衡成分,从而建立了富Fe角的等温截面相图.结果表明,该等温截面存在成分范围很宽的(γFe+αAu)两相区和成分范围很窄的(γFe+L10-FePt)两相区.Pt的加入使Au在γFe中的固溶度从约4%提高到约15%(原子数分数),而大大降低了Fe在αAu中的固溶度;Au的加入使Pt在γFe中的固溶度降低,并且没有扩大(γFe+L10-FePt)两相区.
In order to control the fine L10-FePt nano-phase uniformly distributed in the non-magnetic matrix, it is necessary to systematically study the phase diagram of the Fe-Pt-X system by X-ray diffraction (XRD) The phase equilibrium of Fe-Pt-Au ternary system at 950 ℃ and the equilibrium composition of each phase were determined by SEM and EDS, and the phase diagram of isothermal section of Fe-Pt-Au was established. (ΓFe + αAu) two-phase region and a very narrow composition range (γFe + L10-FePt) exist in the isothermal cross-section.The addition of Pt increases the solubility of Au in γFe from about 4 % To about 15% (atomic fraction), while greatly reducing the solid solubility of Fe in αAu. The addition of Au reduced the solid solubility of Pt in γFe and did not enlarge (γFe + L10-FePt) Phase area.