TITLE

Relation between short-range order and crystallization behavior in Zr-based amorphous alloys

AUTHOR(S)
Xing, L. Q.; Hufnagel, T. C.; Eckert, J.; Lo¨ser, W.; Schultz, L.
PUB. DATE
September 2000
SOURCE
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have examined the effect of Ti and cooling rate on the crystallization of Zr[sub 62-x]Ti[sub x]Cu[sub 20]Ni[sub 8]Al[sub 10](0≤x≤10) amorphous alloys. Ti stabilizes an icosahedral phase in Zr[sub 62-x]Ti[sub x]Cu[sub 20]Ni[sub 8]Al[sub 10](0≤x≤10) alloys. Without Ti (x=0), crystallization produces cubic and tetragonal intermetallic phases, and the crystallization temperature shows no dependence on the cooling rate at which the amorphous alloy was produced. The alloys containing Ti (3≤x≤10) precipitate an icosahedral quasicrystalline phase upon annealing, and show a significant reduction of crystallization temperatures with decreasing cooling rates of casting. We propose that the undercooled melts and amorphous alloys have icosahedral short-range order. The degree of short-range order or medium-range order in the amorphous alloys increases with decreasing cooling rate. Crystallization is easier when the precipitating phase resembles the short-range order of the amorphous solid. Therefore, the crystallization temperature is reduced when the precipitates are icosahedral. The dissimilarity between the structures of the precipitates and the short-range order in amorphous Zr[sub 62]Cu[sub 20]Ni[sub 8]Al[sub 10] may be one of the reasons for its very wide supercooled liquid region. © 2000 American Institute of Physics.
ACCESSION #
4414921

 

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