Deformation Behaviors around/at the Interface between Zn-electrodeposition and Fe-substrate

Abstract

In order to examine the deformation behaviors at/around the interface between η-Zn electrodeposited layer and α-Fe substrate with Burgers orientation relationship, (110) Fe //(0001) Zn and [111] Fe //[1120] Zn , slip systems operated at/around the interface have been analyzed using X-ray back-reflection Laue method, optical microscope and stereographic analyses. The Zn-electrodeposited specimen was deformed at room temperature under a tensile strain rate of 2.8×10 -3 /s. Under low tensile strains below 10%, slip systems having large Schmid factor operate in Fe-substrate. In Zn-layer, slip systems having smaller Schmid factor operate to relax the tensile strain at the interface due to deformation in Fe-substrate, suggesting the constraint due to the cohesion at the Zn/Fe interface. As increasing the tensile strain, the slip systems forming corrugated configuration operate in Fe-substrate and their shear strains at the interface are difficult to be relaxed smoothly by deformation of Zn-layer. As increasing tensile strain, twinning occurs in Zn-layer and the slip system with low critical resolved shear stress operates in the twinned region. The decohesion of Zn-layer from Fe-substrate is induced as increasing the twinned region in Zn-layer.