Structural evolution during heat treatment of mechanically alloyed Al-Cu-Fe-(Si) alloys

Citation
Kb. Kim et al., Structural evolution during heat treatment of mechanically alloyed Al-Cu-Fe-(Si) alloys, MAT SCI E A, 304, 2001, pp. 822-829
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
304
Year of publication
2001
Pages
822 - 829
Database
ISI
SICI code
0921-5093(20010531)304:<822:SEDHTO>2.0.ZU;2-L
Abstract
Structural evolution during mechanical alloying and subsequent heat treatme nt of Al65Cu20Fe15 and Al65Cu20Fe10Si5 was studied by X-ray diffractometry (XRD), transmission electron microscopy (TEM) and differential scanning cal orimetry (DSC). The Al65Cu20Fe15 and Al65Cu20Fe10Si5 powders milled for 10 h hewed a layered structure consisting of Al-. Cu- and Fe-rich lavers. DSC traces obtained from the powder during heating, up to 600 degreesC, showed two exothermic peaks with peak temperatures of 330 and 440 degreesC in Al65 Cu20Fe15 and 330 and 500 degreesC in Al65Cu20Fe10Si5 powders. The lower exo thermic peaks correspond to the formation of Al2Cu and Al7Cu2Fe phases from the layered structure. The second high temperature exotherms correspond to the formation of Al(Fe,Cu) and 1/1 cubic approximant in the Al65Cu20Fe15 p owder and to the formation of Al13Fe9 and 1/1 cubic approximant in the Al65 Cu20Fe10Si5 powder. The Al65Cu20Fe15 and Al65Cu20Fe10Si5 powders annealed f or 5 h st 750 degreesC showed microstructure consisting of Al(Cu,Fe) and Al 13Fe4 phases, and Al13Fe4, icosahsdral and new approximant phases, respecti vely. The partial substitution of Fe by Si increased the stability of tire 1/1 cubic approximant and icosahedral phases. (C) 2001 Published by Elsevie r Science B.V.