Abstract
An as-solidified structure and transformation behaviour on heating of the rapidly solidified Al-Y-Ni-Co-Pd alloy was studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM), differential scanning and isothermal calorimetries. The Al-Y-Ni-Co-Pd ribbon samples have been produced by the melt spinning technique and heat treated using a differential scanning calorimeter (DSC). The addition of Pd to Al-Y-Ni-Co alloys caused disappearance of the supercooled liquid region as well as the formation of the highly dispersed primary α-Al nanoparticles about 3-7 nm in size homogeneously embedded in the glassy matrix upon solidification. An extremely high density of precipitates of the order of 1024 m-3 is obtained. These particles start growing at the temperature below a glass-transition temperature. The results presented in this paper indicate that some of so-called "marginal" glass-formers in as-solidified state are actually not glassy alloys with pre-existed nuclei but crystal-glassy nanocomposites.
Original language | English |
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Pages (from-to) | 78-85 |
Number of pages | 8 |
Journal | Journal of Alloys and Compounds |
Volume | 399 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2005 Aug 16 |
Keywords
- Aluminium alloys
- Differential scanning calorimetry (DSC)
- Melt spinning
- Metallic glasses
- Transmission electron microscopy (TEM)
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry