Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Magnesium has low specific gravity and high specific strength. Also, since it has excellent recyclability, magnesium is expected to be applied as a structural material for the purpose of reducing the weight of transportation parts. In order to apply magnesium to structural material, it is necessary to grasp fatigue characteristics. Fatigue tests were conducted at stress ratio = -1 using specimens cut out parallel to the rolling direction of rolled AZ31 Mg alloy under high stress amplitude. Fatigue tests were also conducted in each case of starting the tensile load and starting the compression load. The result was compared with a specimen cut out perpendicular to the rolling direction. Then, fatigue life of both specimens shortened at the start of compression loading. However, deformed twins are prefer to be formed during tensile load perpendicular to the rolling direction. In addition, it is suggested that the deformation twinning affects fatigue properties near the fatigue limit. Therefore, under high stress amplitude, it is considered that the activity of the slip system other than the deformation twinning also affects the fatigue properties.
