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Atmosphere effects of the amorphization reaction in NiZr by ball milling

Published online by Cambridge University Press:  31 January 2011

K. Aoki ,
A. Memezawa  and
T. Masumoto
K. Aoki
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980, Japan
A. Memezawa
Affiliation:
Graduate School, Tohoku University, Sendai 980, Japan
T. Masumoto
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980, Japan
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Abstract

An intermetallic compound c–NiZr and a mixture of elemental powders of nickel and zirconium [Ni50Zr50 (at. %)] have been mechanically ground (MG) and mechanically alloyed (MA), respectively, using a high-energy ball mill in various atmospheres. The products were characterized by x-ray diffraction, transmission electron microscopy, differential scanning calorimetry, and chemical analysis as a function of milling time. An amorphous a–NiZr alloy was prepared by both MG and MA in an argon atmosphere. By MG of NiZr, an amorphous nitride a–NiZrN0.15 was synthesized in a nitrogen atmosphere, while a crystalline hydride c–NiZrH3 was formed in a hydrogen atmosphere. On the other hand, ZrN and ZrH2 were formed by MA in a nitrogen and a hydrogen atmosphere, respectively. The amorphization reaction was observed between ZrH2 and Ni by further MA in a hydrogen atmosphere, and a mixture of a–NiZrxHy (x < 1) and ZrH2 was obtained. However, no amorphization was observed by MA between ZrN and Ni in a nitrogen atmosphere. The effects of the milling atmosphere on the phase formations during MG and MA are discussed based on the gas absorption rate.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 2 , February 1993 , pp. 307 - 313
Copyright
Copyright © Materials Research Society 1993

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References

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