Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment

Journal of Mining and Metallurgy, Section B Pub Date : 2023-01-01 DOI:10.2298/jmmb230611028r

T. Radetic, M. Popovic, M. Novakovic, V. Rajic, E. Romhanji

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Abstract

The Fe-bearing intermetallic phases present in the as-cast state of an AA6026 alloy and their evolution during homogenization treatments at 480-550?C were studied by optical microscopy, SEM, and TEM techniques combined with EDS analysis. Besides the ?- Al(Fe,Mn)Si phase of dendritic morphology, two types of plate-like Fe-bearing microconstituents were revealed in the microstructure of the as-cast alloy. The EDS microanalysis and electron diffraction showed that one set of platelets represents just thin sections of ?-Al(Fe,Mn)Si microconstituent. The other set of plate-like microconstituents was identified as a tetragonal, silicon-rich ?-Al4(Fe,Mn)Si2 phase. The formation of the ?- Al4(Fe,Mn)Si2 phase has been attributed to the chemical composition of the alloy. During homogenization, metastable ?-Al4(Fe,Mn)Si2 transformed into the ?-Al(Fe,Mn)Si phase and fragmented. The dendritic ?-Al(Fe,Mn)Si microconstituents underwent fragmentation as well. However, whereas ?-Al(Fe,Mn)Si microconstituents preserve b.c.c. crystal lattice throughout the process, the product of the transformation of the ?-Al4(Fe,Mn)Si2 phase exhibited primitive cubic lattice.

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AA6026合金铸态组织中含铁相的识别及其在均匀化处理过程中的演变

AA6026合金铸态含铁金属间相及其在480 ~ 550℃均匀化过程中的演变利用光学显微镜、扫描电镜和透射电镜结合能谱分析对C进行了研究。铸态合金组织中除了枝晶形态的- Al(Fe,Mn)Si相外，还存在两种片状含铁显微成分。能谱分析和电子衍射表明，一组血小板仅代表了-Al(Fe,Mn)Si微组分的薄片。另一组板状微组分被确定为四方的富硅?-Al4(Fe,Mn)Si2相。- Al4(Fe,Mn)Si2相的形成归因于合金的化学成分。在均匀化过程中，亚稳的?-Al4(Fe,Mn)Si2转变为?-Al(Fe,Mn)Si相并破碎。枝晶al (Fe,Mn)Si微组分也发生了断裂。然而，-Al(Fe,Mn)Si微组分在整个过程中保持了b.c.c晶格，而-Al4(Fe,Mn)Si2相的转变产物呈现出原始的立方晶格。

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Journal of Mining and Metallurgy, Section B

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