Investigations of Transition Metal - Rare Earth Alloys. Preparation, Structures, Magnetic, and Permanent Magnet Properties of Rare Earth-Iron and Cobalt Intermetallic Compounds

摘要

The phase diagrams of the binary systems samarium-cobalt and gadolinium-cobalt have been established. The phases present have been checked by X-ray diffraction and X-ray fluorescence methods. The ternary system yttrium-iron-cobalt has been investigated in three essential concentration regions corresponding to the compositions Y(Fe,Co)2, Y(Fe,Co)5 and Y2(Fe,Co)17. Only in the case of Y2(Fe,Co)17 complete solid solubility has been found, the other series show only limited ranges of solid solubility. By the amalgam process the preparation of ReCo5 and Re(Co,Cu)5 alloys has been studied. The results have been compared with alloys, prepared by high frequency melting. Quenched alloys of the composition Re(Co,Cu)5 show complete solid solubility. By static and dynamic magnetic measurements the permanent magnet properties of ReCo5 alloys, prepared by high frequency melting and by the amalgam process have been measured. The influence of different milling methods and of different chemical treatments on the magnetic properties have been determined. Alloys, prepared by the amalgam process are superior to other alloys respective of their permanent magnetic properties. (Author)