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Icosahedral phase formation in rapidly quenched aluminum-ruthenium alloys

Summary: Icosahedral phase formation in rapidly quenched aluminum-
ruthenium alloys
Steven M. Anlagea) and Brent Fultz
Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125
KannanM. Krishnan
National Centerfor Electron Microscopy, Lawrence BerkeleyLaboratory, Berkeley, California 94720
(Received 6 April 1987; accepted 8 February 1988)
Systematic rapid quenching experiments on the icosahedral phase-forming system A\l __x Rux
were performed for x < 20 at. %. The solidified alloys have been studied by electron microscopy
and x-ray diffraction to determine their composition, constituent phases, and phase
morphology. It has been determined that the icosahedral phase must form directly from the
liquid and, at these quench rates, is always found in the presence of second or third phases. The
results have been summarized in a metastable phase diagram appropriate for rapid solidification
of Alj _x Rux at piston and anvil quench rates. This metastable phase diagram describes the
results for Ru concentrations less than Hat. %.
A novel material, containing precipitates display-
ing icosahedral point group symmetry in electron dif-
fraction, along with quasiperiodic translational order,
has recently been formed by rapid solidification.' There


Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park


Collections: Materials Science