抄録
Materials containing second phases show superplastic behavior during thermal cycling (internal stress superplasticity). The authors recently proposed a quantitative model using continuum micromechanics theory for the superplastic behavior. In the present study, this theoretical model has been verified by compression creep tests under thermal cycling conditions using a Be particle dispersed Al matrix alloy as an ideal material. The thermal cycling creep rates were much higher than the isothermal creep rates and proportional to the applied stress at low stresses. However they approached the isothermal creep rates at high stresses. This behavior agrees well with a theoretical prediction, and the value of the thermal cycling creep rate at low stresses coincides with the theoretical one. Therefore it was concluded that the internal stress superplasticity model was applicable to particle dispersed metal matrix composites.
