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Amorphization and disordering of the Ni3Al ordered intermetallic by mechanical milling

Published online by Cambridge University Press:  31 January 2011

J. S. C. Jang  and
C. C. Koch
J. S. C. Jang
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695-7907
C. C. Koch
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695-7907
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Abstract

The ordered fcc intermetallic compound Ni3Al was mechanically milled in a high energy ball mill. The severe plastic deformation produced by milling induced transformations with increasing milling time as follows: ordered fcc → 2; disordered fcc → 2; nanocrystalline fcc + amorphous. The milling time for complete disordering occurred at 5 h for stoichiometric Ni3Al milled at ambient temperature compared to 50 h for the first observation of an amorphous structure. The structural and microstructural evolution with milling time was followed by x-ray diffraction, TEM, hardness, and calorimetry. The major defect believed responsible for inducing the crystalline-to-amorphous transformation is the fine grain boundary structure with nanometer (∼2 nm diameter) dimensions. The calculated interfacial free energy of the grain boundaries is consistent with the estimated free energy difference between the fcc and amorphous phases in Ni3Al.

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 3 , March 1990 , pp. 498 - 510
Copyright
Copyright © Materials Research Society 1990

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