A comparison of indentations of different size and geometry in single-quasicrystalline AIPdMn

Citation
B. Wolf et al., A comparison of indentations of different size and geometry in single-quasicrystalline AIPdMn, J MATER SCI, 35(3), 2000, pp. 723-734
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS SCIENCE
ISSN journal
0022-2461 → ACNP
Volume
35
Issue
3
Year of publication
2000
Pages
723 - 734
Database
ISI
SICI code
0022-2461(200002)35:3<723:ACOIOD>2.0.ZU;2-M
Abstract
The study compares impressions into one and the same single-quasicrystallin e Al70Pd20Mn10 sample (surface of fivefold symmetry) that were performed by spherical and pointed indenters (Vickers- and corner-of-a-cube-geometry) a nd investigated using Atomic Force Microscopy (AFM). The Meyer hardness num ber was found to vary with indentation size in a manner similar to material s that work harden, though this behavior must have a different physical ori gin: for spherical indentations the hardness number slightly increases with increasing load (Meyer hardness evolution), whereas for pyramid-shaped ind enters a considerable hardness increase in case of decreasing load can be s tated. Spherical indentations show little piling-up only in contrast to poi nted indentations where huge elevations surrounding the indent developed. D ifferent degrees of lateral cracking can account for this observation. In c ase of Vickers indentations the material breaks into segments which display mutual shearing. Distinct differences can also be noticed with respect to the volume balance between the apparent piled-up volume around the impressi on and the volume of the displaced material. This balance proves positive f or pyramidal and negative for spherical impressions. (C) 2000 Kluwer Academ ic Publishers.