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Glass forming ability of Nd60TM30Al10 (TM=Fe, Co, Ni, Cu, Mn) alloys

✍ Scribed by Z.G. Sun; G. Kumar; W. Löser; J. Eckert; K.-H. Müller; L. Schultz

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
270 KB
Volume
375-377
Category
Article
ISSN
0921-5093

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✦ Synopsis

Glass forming ability (GFA) of Nd 60 TM 30 Al 10 (TM = Fe, Co, Ni, Cu or Mn) alloys was studied. From X-ray diffraction measurement, highly textured Nd nanocrystallites are observed on the free surfaces of the Fe-, Mn-melt-spun ribbons, while the Co-, Ni-, Cu-melt-spun ribbons are fully amorphous. A significant difference in the phase transformation upon heating is observed between the Fe-, Mn-and the Co-, Ni-, Cu-containing alloys. No glass transition before crystallization is observed in the Fe-and Mn-alloys, but the Co-, Ni-and Cu-alloys exhibit a clear glass transition. The absence of supercooled liquid region for the Fe-, Mn-alloys is explained by the continuous growth of Nd nanocrystallites. The difference in the GFA is strongly related to the heat of mixing between Nd and TM, which is +1, -22, -31, -23, +2 kJ mol -1 for TM = Fe, Co, Ni, Cu or Mn, respectively. The origin of abnormal GFA of Nd 60 Fe 30 Al 10 is discussed in terms of the formation of the metastable A 1 phase.

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