Multi Scale Analysis of Modified AZ61 Alloy Evolution of β-Mg17Al12 Phase and Structure–Property Correlation

Optimizing the microstructure is one of the key processes to achieve the desired mechanical properties for magnesium alloys, such as the AZ61 alloy, which is extensively used in lightweight applications. This study further investigates advanced image processing of the β-Mg ₁₇ Al ₁₂ phase, a crucial intermetallic compound that determines strength and ductility. We developed a novel characterization approach that integrates high-resolution microscopy with automated image segmentation and quantitative analysis to enhance the characterization of the morphology, distribution, and volume fraction of the β-Mg ₁₇ Al ₁₂ phase. The AZ61 alloy underwent controlled thermo-mechanical processing to produce a modified form, resulting in the introduction of refined microstructural features. Furthermore, image analysis indicated significant microstructural evolution, including a homogeneous distribution and coarsening suppression of the β-Mg ₁₇ Al ₁₂ phase, based on process modification. The novelty of this study lies in our application of an image processing technique to the actual images of the sample's cross-sectional area, which allowed us to analyze the β-Mg ₁₇ Al ₁₂ phase effectively and understand how it contributes to optimizing the properties. It establishes a new baseline in accuracy and efficiency for mapping microstructural features that influence mechanical performance. DSC analysis was conducted to study the kinetics of phase transformation, employing advanced imaging techniques such as Small-Angle Neutron Scattering (SANs), solidification thermal mapping, and temperature distribution studies to analyze microstructural evolution.