A comparative study of mechanical alloying and mechanical milling of Nd{sub 8}Fe{sub 88}B{sub 4}
- Beijing Inst. of Aeronautical Materials (China)
- Univ. of Science and Technology, Beijing (China). Inst. of Materials Science and Engineering
A comparative study was made of structure and magnetic properties of Nd{sub 8}Fe{sub 88}B{sub 4} prepared by mechanical alloying (MA) using elemental powders as starting materials and by mechanical milling (MM) of the alloy, X-ray diffraction (XRD) and differential scanning calorimetry (DSC) combined with transmission electron microscopic (TEM) studies revealed that both milling procedures resulted in a mixture of {alpha}-Fe and an amorphous phase. The thermal stability of the as-milled powders produced by MA was comparable to that of the as-milled powders produced by MM. Heat treatment of the milled powders above the crystallization temperature resulted in the formation of a nanocrystalline mixture of Nd{sub 2}Fe{sub 14}B and {alpha}-Fe, but annealed MA powders demonstrated a somewhat coarser structure in comparison with annealed MM powders. Therefore, higher remanences and coercivities were obtained by MM.
- OSTI ID:
- 364017
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 8, Issue 3; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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