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Shouxun Ji

Shouxun Ji

Brunel University London, UK

Title: The formation mechanism of metastable Al6(Fe, Mn) phase in die-cast Al-Mg alloys

Biography

Biography: Shouxun Ji

Abstract

The formation, 3D morphology and growth mechanism of Al6(Fe, Mn) phase were studied in Al-Mg-Mn-Fe alloys processed by high pressure die casting (HPDC). Thermodynamic calculation indicates that Al6(Fe, Mn) phase in the HPDC Al-Mg-Mn-Fe alloys is a metastable phase. The experimental results confirm that Mn addition in the alloy suppresses the transformation from metastable Al6(Fe, Mn) phase to stable Al13(Fe, Mn)4 phase under nonequilibrium 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 hollow structure and the eutectic one is in the form of fine solid particles. The growth mechanism of Al6(Fe, Mn) phase is also elucidated according to the crystallographic rules and the morphological characteristics of Al6(Fe, Mn) phase.

(a) Crystal structure and 3D morphologies of Al6 (Fe, Mn) phase

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