Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 02, 2019 - November 04, 2019
Fine-grained magnesium (Mg) alloy, AZ61, was fabricated by a multi-directional forging (MDFing) method, in which the specimens were forged from three different directions repeatedly. Fine grains were achieved by recrystallization through severe plastic deformation (SPD) during MDFing procedure. In this study, micro-cantilever specimens were fabricated from the samples with and without MDFing by focused ion beam (FIB) process, and plane bending fatigue tests were conducted. The fatigue strengths of the micro-cantilever specimens increased by MDFing compared with the as-received samples, while the pass number had a little effect on the fatigue strengths. Furthermore, micro-cantilever specimens had higher fatigue strengths than the bulk ones. Compared with the bulk specimens, the effect of MDFing was reduced in the micro-cantilevers. The size effect was attributed to the different number of grain boundaries included in the gauge sections of bulk and micro-cantilever samples.
