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High grain size stability of nanocrystalline Al prepared by mechanical attrition

Published online by Cambridge University Press:  31 January 2011

F. Zhou ,
J. Lee ,
S. Dallek  and
E. J. Lavernia
F. Zhou
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697–2575
J. Lee
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697–2575
S. Dallek
Affiliation:
Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817–5700
E. J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697–2575
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Abstract

Grain growth in nanocrystalline (nc) Al with a grain size of 26 nm produced by cryogenic mechanical milling was studied through x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Grain growth kinetics resembled those of ball-milled nc Fe. For homologous temperatures (T/TM) of 0.51–0.83, the time exponent n from D1/n − D01/n = kt was 0.04–0.28, tending toward 0.5 as T/TM increased. Two grain-growth regimes were distinguished: below T/TM = 0.78 growth ceased at an approximate grain size of 50 nm while at higher temperatures, grain growth proceeded steadily to the submicrometer range. Grain growth over the range of temperatures studied cannot be explained in terms of a single thermally activated rate process. The observed high grain size stability was attributed primarily to impurity pinning drag associated with the grain growth process.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3451 - 3458
Copyright
Copyright © Materials Research Society 2001

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