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Plastic deformation in icosahedral Al–Pd–Mn alloys

Published online by Cambridge University Press:  03 March 2011

J.E. Shield ,
M.J. Kramer  and
R.W. McCallum
J.E. Shield
Affiliation:
Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa 50011
M.J. Kramer
Affiliation:
Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa 50011
R.W. McCallum
Affiliation:
Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa 50011
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Abstract

The deformation characteristics of icosahedral Al70Pd21.5Mn8.5 have been investigated by high temperature creep experiments, and the resultant microstructures have been examined by transmission electron microscopy (TEM). From 730 to 780 °C, microstructural analysis revealed that the deformation is controlled by dislocation glide, with an activation energy of 210 ± 30 kJ/mole and a stress exponent of 1.2 ± 0.2. From 780 to 810 °C, microstructures were characteristic of deformation controlled by dislocation glide and climb. The activation energy and stress exponent were determined to be 1700 ± 80 kJ/mole and 2.9 ± 0.3, respectively. Hardness measurements also reflected an increase in dislocation density, as the hardness of the deformed samples was approximately 10% higher than the as-cast sample.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 343 - 347
Copyright
Copyright © Materials Research Society 1994

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References

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