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Solidification Behaviour of Al Particles Embedded in an Ni Aluminide Matrix

Published online by Cambridge University Press:  21 February 2011

K.A.Q O'Reilly ,
W.T. Kim  and
B. Cantor
K.A.Q O'Reilly
Affiliation:
Oxford Centre for Advanced Materials and Composites, Dept. of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
W.T. Kim
Affiliation:
Dept. of Physics, Chong Ju University, 36 Naedok Dong, Chongju, 360-764 Korea
B. Cantor
Affiliation:
Oxford Centre for Advanced Materials and Composites, Dept. of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
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Abstract

A hypereutectic Al-40wt%Ni alloy has been manufactured by melt spinning, and the resulting microstructure examined by transmission electron microscopy. As-melt spun hypereutectic Al-40wt%Ni consists of an Ni aluminide matrix and an A1-rich phase distributed in the form of particles with sizes ∼ 50-100 nm, and as an irregular layer at the cell and grain boundaries. Diffraction analysis of the Ni aluminide matrix is consistent with the ASTM x-ray diffraction standard 2θ values for the orthorhombic NiAl3 phase, a=6.6114 Å, b=7.3662 Å andc=4.8112 Å. The solidification nucleation kinetics of Al-rich particles have been examined by heating and cooling experiments in a differential scanning calorimeter over a range of heating and cooling rates. Solidification of the Al-rich phase at the cell and grain boundaries nucleates catalytically on the surrounding Ni aluminide matrix at an undercooling of ∼ 3 K. Analysis of the solidification nucleation kinetics of the Al-rich phase in Al-40wt%Ni supports the hypothesis [1-4] that the classical spherical cap model of heterogeneous nucleation breaks down at low undercoolings and small contact angles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 27
Copyright
Copyright © Materials Research Society 1998

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References

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