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Magnetic and martensitic transformations in NiMnFeSn melt spun ribbons

Materials Science Forum, ISSN: 1662-9752, Vol: 782, Page: 23-30
2014
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Metrics Details

  • Citations
    7
    • Citation Indexes
      7
  • Captures
    11

Conference Paper Description

Four alloys with nominal compositions NiMnFeSn (x=0, 2, 4, 6 at.%) were cast in an induction vacuum furnace and homogenized. Then they were melted in quartz tubes and ejected onto a rotating copper wheel to produce ribbons. The X-Ray phase analyses of as melt spun ribbons have shown that in both, the ternary as well as in the quaternary alloys a single phase of the Heusler L2 type ordered structure was found. The characteristic temperatures of magnetic (T) and martensitic (M) transformations were determined by a vibrating sample magnetometer (VSM). Both the M and T increase with the increase of Fe content in all alloys, which is in accordance with the theory of valence electron concentration (e/a) influence on M. The phase structures, chemical compositions, grains sizes and type of microsegregation were characterized by use of transmission electron microscope (TEM). The equi-axed grains of size from 0.95 to 1.7 μm were observed in all ribbons. The grains posses the L2 structure at room temperature, however in the alloys with higher Fe content the different type of martensite was observed at the grain boundaries of L2 phase. Appearance of this martensite was explained in relation to microsegregation of particular elements during melt spinning process and simultaneous change in the e/a ratio. © (2014) Trans Tech Publications, Switzerland.

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