摩擦攪拌接合用ツール合金の摩耗痕TEM解析

抄録

Friction stir welding (FSW) is a joining method which uses the frictional heat generation between a rotating tool and joining metals. Furthermore, cracks, residual stresses and distortions which are the problems of the conventional welding do not occur because FSW works in the solid state¹⁾. Cobalt alloys have high durability in high temperature, so that these alloys are used for the FSW tool material when it is predicted breaking. However, cobalt alloys were worn compared with steel tools in our previous study. Therefore, we carried out reciprocating wear test up to 200 °C in addition to the preceding presentation in this study. And we analyzed the under structure of wear scar using TEM.