Structural investigation of cold-rolled metallic glasses using positron annihilation methods

Abstract

The effect of cold rolling on the structure of a metallic glass Pd0.775Cu0.06Si0.165 and a crystalline Pd has been investigated using positron annihilation methods. Only slight change in both the positron lifetime and angular distribution upon cold rolling has been noted for the metallic glass. This is in strong contrast to a large change observed for the crystalline Pd. It is therefore concluded that cold rolling of the metallic glass induces no vacancylike defects. It is also suggested that the local atomic rearrangements during plastic deformation may lead to the densification of the metallic glass.