Magnetic Properties of Nano-sized BCC Alloys Prepared by Ball Milling (ナノコンポジット材料<特集>)

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Three bcc metals and an alloy (Cr, Mo, W, Cr-Fe) were ball-milled by tungsten carbide, carbon steel and stainless steel vial/balls to prepare nano-sized materials of grain sizes of 5.5-17nm. Mössbauer spectroscopy, magnetization and X-ray diffraction measurements were performed. A presence of the grain boundary component and the crystalline component of the Fe hyperfine field was confirmed for the boc nanocrystallites studied The average hyperfine fields of these two oomponents were independent of the materials studied, and independent of temperature down to about 20K A significant reduction in the magnetic moment of Fe occurred in the nano-sized Cr-20at%Fe.
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