Metalurgija, Vol. 52 No. 1, 2013.
Prethodno priopćenje
Shapes of the icosahedral quasicrystalline phase in melt-spun ribbons
T. Bončina
; University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia
Sažetak
The shapes of icosahedral quasicrystalline (IQC) particles were determined in melt-spun ribbons of alloys based on the Al-Mn-Be alloy system. The sizes of the quasicrystalline particles ranged from a few tenths of nanometres up to 1 μm. Therefore, different methods were employed for characterizing their shapes: projection of quasicrystalline particles using transmission electron microscopy (TEM), cross-sections of IQCs on metallographically polished surfaces, and observation of deep-etched samples and extracted particles using a scanning electron microscope (SEM). It was discovered that icosahedral quasicrystalline particles preferentially grow in three-fold directions and have a tendency for faceting and adopting the shape of a pentagonal dodecahedron. The evolution of quasicrystalline shapes is systematically presented.
Ključne riječi
Al-alloy; metallography; ribbon; icosahedral quasicrystalline phase; shape; melt-spinning
Hrčak ID:
86767
URI
Datum izdavanja:
1.1.2013.
Posjeta: 1.325 *