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Abstract
By introducing limited angular oscillation (LAO) during the initial stages of solidification, experiments were conducted to examine the potency of LAO for grain refining of commercial Mg–Al alloys. Significant grain refinement has been successfully achieved at oscillation intensities above the critical value. The refinement effect by solute content occurs across the oscillation intensity range examined and is more pronounced under the conditions of weak oscillation intensity. The refinement effectiveness for Mg–Al alloys is AZ31>AZ61>AZ91. Oscillation intensity plays a more important role in determining the extent of grain refining than the solute content. Theoretical discussions provide new clues to understanding of the mechanism of grain refinement by LAO.
Financial supports from the National Natural Science Foundation of China (grant no. 50804023), the Ministry of Education Focused on Scientific and Technological Research Project (grant no. 205084) and the Scientific and Technological Project from Jiangxi Provincial Education Department (grant no. GJJ12032) are gratefully acknowledged.