抄録
It is well known that the mechanical properties increase rapidly with refining on grain size less than 1μm In this study, to obtain fine grained materials, we developed a novel high straining process easily applicable to bulk materials, that is, Multi-axial Alternative Forging (MAF), in which the work pieces were rotated by 90°on the longitudinal axis in each forging process performed at 543K for the Al-Mg alloy. The MAFed materials showed a significant developed microstructure having grain sizes less than 1μm. The most of fine grains were surrounded by high-angle and random boundaries. The strength increases with an increase of pre- straining without a decrease of ductility. As described above, MAF process is one of the most effective methods to produce fine-grained structure and enhance of its mechanical properties.
