An investigation of stored energy in uniaxial and biaxial directional rolling on mechanical properties and microstructure of pure copper

Abstract

This work compares conventional unidirectional rolling (UDR) and cross rolling (CR) based on mechanical properties, microstructure, and stored energy. Pure copper is subjected to UDR and CR to true strains of 0.69, 1.39, 2.08, and 2.77, respectively. The UDR samples show high strength and hardness compared to the CR. Investigation of microstructures of formed samples using optical microscopy and EBSD revealed that the grains were elongated along with the rolling directional for UDR and fairly equiaxed grains with reduced anisotropy for CR. The stored energy calculated using calorimetry experiments was correlated with mechanical and microstructure evolution.

Keywords:

• Cross rolling
• microhardness
• microstructure
• stored energy
• unidirectional rolling

Acknowledgments

We acknowledge the National facility for OIM and Texture IIT Bombay for EBSD measurements, SRMIST for high-resolution scanning electron microscope (HR-SEM) facility and differential scanning calorimetry. We thank Mr. Manavallan, Materials Processing Lab, SRM IST, for the support in optical microscopy.