On some discrepancies in the literature about the formation of icosahedralquasi-crystal in Al-Cu-Fe alloys

Citation
Jn. Gui et al., On some discrepancies in the literature about the formation of icosahedralquasi-crystal in Al-Cu-Fe alloys, J MATER RES, 16(4), 2001, pp. 1037-1046
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS RESEARCH
ISSN journal
0884-2914 → ACNP
Volume
16
Issue
4
Year of publication
2001
Pages
1037 - 1046
Database
ISI
SICI code
0884-2914(200104)16:4<1037:OSDITL>2.0.ZU;2-R
Abstract
To clarify some discrepancies in the literature about the formation of icos ahedral quasi-crystal (IQC) in Al-Cu-Fe alloys, microstructures, and consti tuent phases of Al62.5Cu25Fe12.5 and Al65Cu20Fe15 alloys were studied, Each dendritic arm of the primarily solidified lambda -Al13Fe4 phase is a singl e crystal that possesses no definite orientation relationship with the IQC, formed by peritectic reaction (L + lambda + beta --> IQC) or a solid-state reaction (Cu-rich phases + lambda + beta --> IQC), This fact disproves an assumption that h-phase is an approximant of the IQC, Two types of cubic ph ase, beta -phase with CsCl structure containing more Fe and tau (3) phase, which is a superstructure and contains less Fe, were observed depending on the composition and thermal history of the samples.