Investigation wavy interface forming and stretching in severe plastic deformed copper/steel bimetallic rod

Abstract

Bimetallic copper-clad steel rod was prepared via three successive passing the samples through equal-channel angular pressing (ECAP) die with route Bc. The core steel tensile properties and copper/steel interface microstructures were investigated after each passes. It is observed the yield strength of steel core increased from about 200 MPa to 840 MPa and equiaxed grains with the size lower than the one-third of the initial size were formed. Only, during the third passing of ECAP deformation, the copper/steel interface was changed to waveforms in some angular positions. The shear strain and mating surface stretch were modeled to explain this phenomenon.

Keywords:

• Equal channel angular pressing
• bimetallic rod
• wavy interface
• analytical model