Characterisation of Fe Distribution in the Liquid–Solid Boundary of Al–Zn–Mg–Si Alloy Using Synchrotron X-ray Fluorescence Microscopy
He Tian, Dongdong Qu, Nega Setargew, Daniel J. Parker, David J. Paterson, David StJohn, Kazuhiro Nogita
TL;DR
This study uses advanced imaging to track how iron distributes in an aluminum alloy coating during solidification, revealing a key phase formation at 495°C.
Contribution
The paper provides new insights into Fe distribution and phase formation in Al–Zn–Mg–Si alloys during directional solidification.
Findings
A mass nucleation of the Fe-based τ6 phase occurred at 495°C following a peritectic reaction.
Synchrotron X-ray fluorescence microscopy confirmed Fe distribution at sub-1 wt% levels.
Directional solidification revealed temperature-dependent microstructural changes.
Abstract
Al–Zn–Mg–Si alloy coatings have been developed to inhibit the corrosion of cold-rolled steel sheets by offering galvanic and barrier protection to the substrate steel. It is known that Fe deposited from the steel strip modifies the microstructure of the alloy. We cast samples of Al–Zn–Mg–Si coating alloys containing 0.4 wt% Fe and directionally solidified them using a Bridgman furnace to quantify the effect of this Fe addition between 600 °C and 240 °C. By applying a temperature gradient, growth is encouraged, and by then quenching the sample in coolant, the microstructure may be frozen. These samples were analysed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) to determine the morphological effects of the Fe distribution across the experimental temperature range. However, due to the sub 1 wt% concentration of Fe, synchrotron X-ray fluorescence…
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Taxonomy
TopicsAluminum Alloy Microstructure Properties · Microstructure and Mechanical Properties of Steels · Microstructure and mechanical properties