Time-resolved deformation measurements of the Portevin–Le Chatelier bands

The displacement and strain fields of the PLC band are quantitatively measured using a technique based on high-speed digital photography and digital speckle correlation (DSC) method. The results show the nucleation process of a type B band within a few milliseconds. Even the type A band intermittently propagates with steps smaller than the band width. It is verified that the elastic shrinkage deformation exists outside a PLC band during avalanche-like deformation.