抄録
An Al-Zn eutectoid alloy known as a fine-grained superplastic material is tested in tension and compression under superplastic condition, and the influence of the stress state on superplastic deformation behavior, such as flow stress, is investigated. In the compression test, deformation is interrupted and turning is performed to remove a barreled portion so that the specimen section becomes uniform, and then the deformation is continued. As the result, flow stress in the compression becomes higher than that in tension although it is found to be slightly reduced by the removal of barreled portion.
