Solid-state transformation of Fe-rich intermetallic phases in Al–5.0Cu–0.6Mn squeeze cast alloy with variable Fe contents during solution heat treatment

• Published in: Materials characterization Vol. 104; pp. 124 - 131
• Main Authors: Lin, Bo, Zhang, Weiwen, Zhao, Yuliang, Li, Yuanyuan
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.06.2015
• Subjects: Alloys; ALUMINIUM COMPOUNDS; Aluminum base alloys; Al–Cu cast alloys; CASTING; COPPER COMPOUNDS; Etching; Fe-rich intermetallics; INTERMETALLIC COMPOUNDS; Intermetallics; MANGANESE COMPOUNDS; MATERIALS SCIENCE; PHASE TRANSFORMATIONS; Phases; SCANNING ELECTRON MICROSCOPY; Solid-state transformation; SOLIDS; SOLUTION HEAT; Solution heat treatment; Squeeze casting; TERNARY ALLOY SYSTEMS; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; Al–Cu cast alloys; Fe-rich intermetallics; Squeeze casting; Solid-state transformation
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2015.03.035

The Al–5.0wt.% Cu–0.6wt.% Mn alloys with a variable Fe content were prepared by squeeze casting. Optical microscopy (OM), Deep etching technique, scanning electron microscopy(SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to examine the solid-state transformation of Fe-rich intermetallics during the solution heat treatment. The results showed that the Chinese script-like α-Fe, Al6(FeMn) and needle-like Al3(FeMn) phases transform to a new Cu-rich β-Fe (Al7Cu2(FeMn)) phase during solution heat treatment. The possible reaction and overall transformation kinetics of the solid-state phase transformation for the Fe-rich intermetallics were investigated. [Display omitted] •The α-Fe, Al6(FeMn) and Al3(FeMn) phases change to the β-Fe phases.•Possible reactions of Fe phases during solution heat treatment are discussed.•The overall fractional transformation rate follows an Avrami curve.