Amorphization and Disordering of The Ni3Ai Ordered Intermetallic by Mechanical Milling

J. S.C. Jang, C. C. Koch

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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 → disordered fcc → 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 fee and amorphous phases in Ni3Al.

Original languageEnglish
Pages (from-to)498-510
Number of pages13
JournalJournal of Materials Research
Volume5
Issue number3
DOIs
StatePublished - Mar 1990

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