Aluminium phosphide as a eutectic grain nucleus in hypoeutectic Al-Si alloys

Nogita, K, McDonald, SD, Tsujimoto, K, Yasuda, K and Dahle, AK (2004) Aluminium phosphide as a eutectic grain nucleus in hypoeutectic Al-Si alloys. Journal of Electron Microscopy, 53 4: 361-369. doi:10.1093/jmicro/dfh048


Author Nogita, K
McDonald, SD
Tsujimoto, K
Yasuda, K
Dahle, AK
Title Aluminium phosphide as a eutectic grain nucleus in hypoeutectic Al-Si alloys
Journal name Journal of Electron Microscopy   Check publisher's open access policy
ISSN 0022-0744
Publication date 2004
Sub-type Article (original research)
DOI 10.1093/jmicro/dfh048
Volume 53
Issue 4
Start page 361
End page 369
Total pages 9
Editor Hideki Ichinose
Place of publication England
Publisher Oxford University Press
Collection year 2004
Language eng
Subject C1
291302 Physical Metallurgy
671004 Castings
Abstract Aluminium phosphide (AlP) particles arc often suggested to be the nucleation site for eutectic silicon in Al-Si alloys, since both the crystal structure and lattice parameter of AlP (crystal structure: cubic K(4) over bar m; lattice parameter: 5.421 Angstrom) are close to that of silicon (cubic Fd3m, 5.431 Angstrom), and the melting point is higher than the Al-Si eutectic temperature. However, the crystallographic relationships between AlP particles and the surrounding eutectic silicon are seldom reported due to the difficulty in analysing the AlP particles, which react with water during sample preparation for polishing. in this study, the orientation relationships between AlP and Si are analysed by transmission electron microscopy using focused ion-beam milling for sample preparation to investigate the nucleation mechanism of eutectic silicon on AlP. The results show a clear and direct lattice relationship between centrally located AlP particles and the surrounding silicon in the hypoeutectic Al-Si alloy.
Keyword Microscopy
Al-si Alloy
Eutectic
Solidification
Nucleation
Aluminium Phosphide
Focused Ion Beam
Q-Index Code C1

 
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