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Nanograin-Boundary-Controlled Reordering in Mechanically Disordered Nanocrystalline L12-Type Ni3 Al+Fe
Published online by Cambridge University Press: 25 February 2011
Abstract
Using mechanical attrition (milling) which also transforms the material into nanocrystalline form, various L12 or γ-type Ni3 A1-Fe alloys have been prepared in metastable-γ form and their magnetisations M(γ) and M(γ) and Curie temperatures Tc(γ) and Tc(γ) measured.
Using magnetic properties we determine isothermal ordering kinetics in the nanocrystalline γstate and find that the ordering reaction cannot propagate across the nanograin boundaries. Each grain must obtain its own γ nucleus thus resulting in a Johnnson-Mehl-Avrami exponent n =1.
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- Copyright © Materials Research Society 1993