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Mechanical properties of quasicrystals investigated by indentation and scanning probe microscopes
Author(s) -
Wolf B.,
Paufler P.
Publication year - 1999
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199905/06)27:5/6<592::aid-sia515>3.0.co;2-s
Subject(s) - quasicrystal , nanoindentation , indentation , materials science , icosahedral symmetry , composite material , modulus , scanning electron microscope , anisotropy , elastic modulus , crystallography , optics , chemistry , physics
Abstract Hardness, elastic modulus and crack propagation were studied usingmicro‐ and nanoindentation, atomic force microscopy andscanning acoustic microscopy. We present measurements performed onicosahedral AlPdMn (three‐dimensional quasicrystal)and decagonal AlCuCoSi (two‐dimensionalquasicrystal) from room temperature to 550 °C. Additionally,YMgZn was impressed at room temperature. The surface of icosahedralspecimens became fractured into segments exhibiting steps in heightalong shear cracks. Quantity of piling up as well as number andextension of cracks are smaller for the two‐dimensionalquasicrystalline material, which also displays a hardness anisotropybetween different surface orientations. Quantitative hardnessmeasurements revealed a strong indentation size effect exhibiting ahardness increase with decreasing load at room temperature, and theinverse behaviour for higher temperatures. Copyright © 1999 JohnWiley & Sons, Ltd.