Abstract
In this paper, we report the formation of the new quaternary icosahedral quasicrystal in the Al-Mn-Si-Be system, which has a primitive icosahedral structure and has a significant lower cooling rate at the time of its formation. The icosahedral quasicrystalline phase was found to form in the Al-rich composition of Al-Mn-Si-Be alloy by conventional casting technique as well as by rapid quenching technique, indicating that the addition of Be to Al-Mn-Si alloys improves the quasicrystal forming ability. The icosahedral phase in conventionally cast Al-Mn-Si-Be alloys forms as a dendritic phase in the under-cooled melt showing five well-developed branches indicating the five-fold symmetry structure. At the later stage of the growth of the icosahedral phase, 1/1 approximant phase forms heterogeneously from the icosahedral phase. The Al-Mn-Si-Be icosahedral phase is metastable, and transforms into the 1/1 cubic approximant phase at high temperature.
Original language | English |
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Pages (from-to) | 992-997 |
Number of pages | 6 |
Journal | Materials Science and Engineering A |
Volume | 375-377 |
Issue number | 1-2 SPEC. ISS. |
DOIs | |
Publication status | Published - 2004 Jul |
Bibliographical note
Funding Information:The authors are grateful for the financial support by the Creative Research initiatives of the Korean Ministry of Science and Technology.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering