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Deformation-induced nanocrystallization: A comparison of two amorphous Al-based alloys

Published online by Cambridge University Press:  01 March 2005

W.H. Jiang ,
F.E. Pinkerton  and
M. Atzmon
W.H. Jiang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109
F.E. Pinkerton
Affiliation:
General Motors R & D Center, Warren, Michigan 48090
M. Atzmon
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, and Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
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Abstract

Using conventional and high-resolution transmission electron microscopy (HRTEM), the effects of rolling at room temperature on the microstructures of amorphous Al90Fe5Gd5 and Al86.8Ni3.7Y9.5 were compared. In rolled Al90Fe5Gd5, nanocrystallites were observed at shear bands, whereas none were observed in rolled Al86.8Ni3.7Y9.5. When HRTEM was combined with with Fourier transform filtering, nanoscale, low-density defects were imaged. In Al90Fe5Gd5, the shear bands contain few defects, which are concentrated at the boundary zone between the shear bands and undeformed region, whereas in Al86.8Ni3.7Y9.5, the shear bands contain a uniform distribution of defects with a density higher than the undeformed region. The preferential precipitation of nanocrystallites in rolled Al90Fe5Gd5 is attributed to a kinetic effect due to uniformly-distributed excess free volume in the shear bands.

Keywords

Metallic glassPhase transformationTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 696 - 702
Copyright
Copyright © Materials Research Society 2005

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