Abstract
Solidification behaviour of lead particles embedded in icosahedral and decagonal quasicrystalline matrix has been studied. Differential scanning calorimetry traces for the icosahedral matrix show a sharp lead melting peak but a very flat solidification exotherm with several peaks, while lead in the decagonal matrix shows sharp melting and solidification peaks. Transmission electron microscopy shows that lead particles are faceted on major planes of the matrix. The solidified lead particles show well defined orientation relationships with the matrix. Three relationships were observed in the case of the icosahedral matrix in all of which there is a tendency for the lead {022} planes to align with icosahedral {211111} and {221001} planes. In the decagonal matrix a single relationship is observed. The calculated contact angles for nucleation show that lead solidification on quasicrystalline surfaces occur at higher undercoolings for the same contact angles, as compared to solidification on crystals.
| Original language | English |
|---|---|
| Pages (from-to) | 4641-4656 |
| Number of pages | 16 |
| Journal | Acta Materialia |
| Volume | 46 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 1998 Aug 10 |
| Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys