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Author Schmitz, G. ♦ Ewert, J. C. ♦ Harbsmeier, F. ♦ Uhrmacher, M. ♦ Haider, F.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword MATERIALS SCIENCE ♦ ALLOYS ♦ ELECTRONS ♦ IRRADIATION ♦ MICROSTRUCTURE ♦ PHASE STABILITY ♦ NICKEL ALLOYS ♦ ALUMINIUM ALLOYS
Abstract The disordering of a decomposed Ni-12at.%-Al alloy under irradiation with 300-keV Ni{sup +} ions is studied in direct comparison to homogeneous Ni{sub 3}Al at various temperatures. For that, the degree of long-range order is quantitatively determined by electron diffractometry. Heterogeneous alloys disorder significantly faster than the homogeneous intermetallic. In addition, their disordering rate depends on the precipitate size of the microstructure. At 823 K a steady state with an intermediate degree of order is reached. The experimental results are compared with model calculation based on a Cahn-Hilliard-type continuum model. At higher temperatures the model yields a correct description of the experiments. However, discrepancies at room temperature suggest a direct coupling of local composition and degree of order during the collision cascade. This interpretation is further supported by Monte Carlo simulations of overlapping cascade events.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-06-01
Publisher Place United States
Journal Physical Review B
Volume Number 63
Issue Number 22


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