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The formation mechanism of Al6(Fe, Mn) in die-cast Al–Mg alloys

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Abstract

The formation, 3D morphology and growth mechanism of the Al6(Fe, Mn) phase were studied in Al–Mg–Mn–Fe alloys processed using high pressure die casting (HPDC). Thermodynamic calculations and the observed microstructures indicate that the Al6(Fe, Mn) phase in the HPDC Al–Mg–Mn–Fe alloys is a dominant metastable phase in phase competition with the stable Al13(Fe, Mn)4 phase. The experimental results confirm that Mn addition in the alloy suppresses the transformation from the metastable Al6(Fe, Mn) phase to the stable Al13(Fe, Mn)4 phase under non-equilibrium solidification conditions. Energy-dispersive spectroscopy (EDS) analysis of extracted particles reveals that the average Mn/Fe atomic ratio in the Al6(Fe, Mn) phase decreases as the Mn/Fe atomic ratio in the melt decreases. It is also found that the Al6(Fe, Mn) phase grows to form two elongated prism morphologies: rhombic prism (equilibrium morphology, bounded by {110} and {002}), and rectangular prism (growth morphology, bounded by {002}, {200} and {020}). The primary Al6(Fe, Mn) phase shows a hollow structure and the eutectic phase is in the form of fine solid particles. The growth mechanism of the Al6(Fe, Mn) phase is also elucidated according to the crystallographic rules and the morphological characteristics of the Al6(Fe, Mn) phase.

Graphical abstract: The formation mechanism of Al6(Fe, Mn) in die-cast Al–Mg alloys

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Publication details

The article was received on 27 Apr 2018, accepted on 04 Jun 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8CE00675J
Citation: CrystEngComm, 2018, Advance Article
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    The formation mechanism of Al6(Fe, Mn) in die-cast Al–Mg alloys

    X. Zhu, P. Blake and S. Ji, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00675J

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