Paper Title:
Crystallization Behaviors of the Bulk Amorphous Alloy Ni60Zr25Al8Y7
  Abstract

The effects of partial replacements of Zr by Y in the alloy Ni60Zr25-xAl8Yx(x=0 and 7 at %) on the crystallization behaviors of amorphous alloys were studied using isothermally heattreated ribbons. With the partial replacement, the supercooled liquid region upon continuous heating was significantly extended indicating that crystallization can be effectively suppressed by the optimum amount of Zr replacement by Y. The first phase appeared during crystallization was identified as the ternary compound AlNi2Zr while the single exothermic event could be observed upon heating the amorphous ribbons. The AlNi2Zr phase was decomposed into binary compounds upon further heating. Therefore, the extended supercooled liquid region of the alloy Ni60Zr25Al8Y7 was attributed to the suppression of AlNi2Zr phase formation by the partial replacement of Zr by Y. The effects of Y on the crystallization behaviors were discussed on the basis of atomic configuration of the supercooled liquid.

  Info
Periodical
Materials Science Forum (Volumes 449-452)
Edited by
S.-G. Kang and T. Kobayashi
Pages
941-944
DOI
10.4028/www.scientific.net/MSF.449-452.941
Citation
W.B. Kim, B.J. Ye, S. Yi, "Crystallization Behaviors of the Bulk Amorphous Alloy Ni60Zr25Al8Y7 ", Materials Science Forum, Vols. 449-452, pp. 941-944, 2004
Online since
March 2004
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$32.00
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