(P220-P0142)Finding the Optimal Processing Parameters of Friction Stir Processing to Achieve Room Temperature Superplasticity in Cast Zn-22Al Alloys

摘要

Japan is a country where earthquakes frequently occur, and in order to prevent structuraldamage, room temperature superplastic Zn-22Al alloy dampers are used. It has been predicted that a verylarge earthquake may occur in the future, and so the need for widespread application and miniaturization hasbecome increasingly important. However, the thermomechanical heat treatment of large samples in order toachieve fine grain size to enable room temperature superplasticity is difficult. One way of overcoming thisproblem is to use friction stir processing (FSP), a grain refinement process that uses severe plasticdeformation.