Quantitative Relationship Analysis of Mechanical Properties with Microstructure and Texture Evolution in AZ Series Alloys

The present study investigated the correlation between microstructure, texture, and mechanical properties of AZ31 sheets. In magnesium alloys, microstructural and texture factors have a decisive influence on mechanical properties due to their specific c/a ratios for hexagonal close-packed structure. It is well known that the yield strengths of Mg alloys are followed by the Hall-Petch relation. Nevertheless, AZ-based sheets with relatively large grain size exhibit higher yield strength than those with finer microstructure. This is mainly due to the texture strengthening. For this reason, there is an increasing need to quantify the contribution of texture and microstructure to mechanical properties in Mg alloys. A multiple regression analysis is conducted to explore the quantitative correlation of the mechanical properties with the microstructure and texture factors, such as grain size, phase fraction of secondary particles, maximum intensity of basal poles, and Schmid factor for basal \a[ slip. This study focuses on evaluating quantitatively the relative weights of microstructure and texture evolution such as grain refinement and texture weakening, when determining yield strength depending on loading direction at room temperature.