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Spontaneous Crystalline Multilayer Formation in Ni Implanted Al at 100 K

Published online by Cambridge University Press:  17 March 2011

Alexandre Cuenat ,
Aicha Hessler-Wyser ,
Max Döbeli  and
Rolf Gotthardt
Alexandre Cuenat
Affiliation:
Institut de Génie atomique, Département de Physique, Ecole Polytechnique Fédérale Lausanne, 1015 Lausanne, Switzerland
Aicha Hessler-Wyser
Affiliation:
Institut de Génie atomique, Département de Physique, Ecole Polytechnique Fédérale Lausanne, 1015 Lausanne, Switzerland
Max Döbeli
Affiliation:
Ion Beam Physics, Paul Scherrer Institut, c/o IPP HPK H32, ETH Hoenggerberg, 8093 Zuerich, Switzerland
Rolf Gotthardt
Affiliation:
Institut de Génie atomique, Département de Physique, Ecole Polytechnique Fédérale Lausanne, 1015 Lausanne, Switzerland
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Abstract

The microstructure evolution of aluminum implanted with nickel at 5 MeV and at 100 K to a local concentration of 25 at. % is described. Transmission Electron Microscopy (TEM) observa- tions and Rutherford Backscattering Spectrometry (RBS) experiments are conducted to deter-mine the Ni profile and the microstructure of the implanted samples. For lower Ni concentration, it has been previously observed that Al0.75Ni0.25 amorphous precipitates are formed together with a high dislocation density. When the Ni concentration reaches 25 at. %, a new crystalline multi-layered microstructure is observed: the TEM observations reveal the presence of well-defined crystalline layers separated by sharp interfaces. To our knowledge, it is the first time that such a structure is observed without further annealing of the implanted sample. A series of mechanisms describing the formation of the crystalline multilayer are briefly discussed. It is argued that its formation is the result of a recrystallization front produced by the exothermal amorphous to crystal transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 647: Symposium O – Ion Beam Synthesis & Processing of Advanced Materials , 2000 , O7.2
Copyright
Copyright © Materials Research Society 2001

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