Microstructures of precipitation-hardened SmCo permanent magnets

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  • L. Rabenberg
    Department of Materials Science and Mineral Engineering and the Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
  • R. K. Mishra
    Department of Materials Science and Mineral Engineering and the Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
  • G. Thomas
    Department of Materials Science and Mineral Engineering and the Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

抄録

<jats:p>The microstructural features of isothermally aged and step aged and isothermally aged Sm(Co, Cu ,Fe, Zr)7.4 alloys are examined using electron microscopy and x-ray microanalysis. The microstructure is seen to consist of a cellular morphology with twinned rhombohedral 2:17 phase cell interiors, 1:5 phase cell boundaries, and elongated thin platelets with a 1:3 structure. Upon prolonged aging, Zr preferentially goes into the 1:3 phase, Cu to both the 1:5 and the 1:3 phase, and Fe to the 2:17 phase. Isothermal aging at 850 °C facilitates the growth of the cells and the low-temperature step aging facilitates the chemical partitioning of the transition metals. The role of Zr in developing the morphology and the chemical partitioning is discussed.</jats:p>

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