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Collision Cascades in Zr3Al

Published online by Cambridge University Press:  26 February 2011

L. M. Howe  and
M. H. Rainville
L. M. Howe
Affiliation:
AECL Research, Advanced Materials Research Branch Chalk River Laboratories Chalk River, Ontario KOJ 1J0, Canada
M. H. Rainville
Affiliation:
AECL Research, Advanced Materials Research Branch Chalk River Laboratories Chalk River, Ontario KOJ 1J0, Canada
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Abstract

Zr3Al is an ordered f.c.c. alloy of the L12 type, which under various irradiation conditions can be disordered and then eventually amorphized. In the present transmission-electron-microscopy (TEM) investigation, the nature of the damaged regions formed in individual collision cascades was investigated using low fluence (< 1 × 1011 ions cm−2) bombardments at 290 K with 15 − 120 keV 63Cu ions.

Imaging under dynamical conditions with the fundamental 111, 200, 220 and 113 reflections revealed damaged regions (5.1 - 8.1 nm average diameter) that exhibited black-white strain contrast features. These damaged regions have essentially a spherically symmetrical strain field and probably are three-dimensional clusters of point defects. Imaging with 110 superlattice reflections revealed additional damaged regions (2.4 - 3.7 nm average diameter), which appeared as black spots, that represent disordered regions in the ordered lattice. For both the strain-contrast regions and the disordered regions, as the incident ion energy increased, the number of damaged regions produced per incident ion increased and the fraction of the theoretical collision cascade volume occupied by these regions decreased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 201: Symposium A – Surface Chemistry and Beam-Solid Interactions , 1990 , 215
Copyright
Copyright © Materials Research Society 1991

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