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Thirunavukkarasu, G.
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article
A study on the phase transformation of γ2-Al8Mn5 to LT-Al11Mn4 during solutionizing in AZ91 alloy
Abstract
<p>γ<sub>2</sub>-Al<sub>8</sub>Mn<sub>5</sub> intermetallic particles are generally present in commercial Mg-Al-Zn alloys. The present study is concerned with the effect of solutionizing on the morphology and phase stability of the γ<sub>2</sub>-Al<sub>8</sub>Mn<sub>5</sub> particles in an as-cast AZ91 alloy. Analysis using energy dispersive spectroscopy (EDS) and electron back scattered diffraction (EBSD) in a scanning electron microscope (SEM), transmission electron microscopy (TEM) and atom probe tomography (APT) suggests that solutionizing resulted in uphill diffusion of Al from the α-Mg matrix resulting in the phase transformation of γ<sub>2</sub>-Al<sub>8</sub>Mn<sub>5</sub> to Low Temperature (LT) -Al<sub>11</sub>Mn<sub>4</sub> phase. This leads to a shell type structure of LT-Al<sub>11</sub>Mn<sub>4</sub> encapsulating γ<sub>2</sub>-Al<sub>8</sub>Mn<sub>5</sub> and the formation of cracks in the LT-Al<sub>11</sub>Mn<sub>4</sub> phase. These can propagate during external loading, affecting the mechanical properties. Additionally, the content of Fe and Si decreased in the LT-Al<sub>11</sub>Mn<sub>4</sub>, which could potentially decrease locally the corrosion resistance.</p>