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Mechanism of Al-Cu-Fe Quasicrystal Plastic Deformation Studied by Instrumented Sharp Indentation

Published online by Cambridge University Press:  17 March 2011

Sergey N. Dub ,
Yuly V. Milman ,
Dina V. Lozko  and
Anton N. Belous
Sergey N. Dub
Affiliation:
Institute for Superhard Materials, Kiev, 04074, UKRAINE, frd@ism.kiev.ua
Yuly V. Milman
Affiliation:
Institute of Material Science Problems, Kiev, 03142, UKRAINE, milman@materials.kiev.ua
Dina V. Lozko
Affiliation:
Institute of Material Science Problems, Kiev, 03142, UKRAINE
Anton N. Belous
Affiliation:
Institute of Material Science Problems, Kiev, 03142, UKRAINE
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Abstract

Cyclic nanohardness tests of Al65Cu23Fe12 quasicrystal reveals a different mechanism of plastic deformation as compared with a regular metal. For a polycrystalline metal, the indent depth increases monotonically with load, while for a quasicrystal, it increases stepwise. Probably, the step formation in the Al-Cu-Fe quasicrystal loading curve is due to the structural transformation in the indent. It is known that the quasicrystal structure destroys at high pressure and transforms into a regular crystalline structure. Therefore, it is possible to attribute the pressure drop in the indent to the transformation of the quasicrystalline structure into the crystalline one and extrusion of the plastic polycrystalline metallic phase out from indent. The observation of thin layers extruded out of the indent in Al-Cu-Fe quasicrystal supports this assumption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q7.12
Copyright
Copyright © Materials Research Society 2001

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References

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