Work-hardening of polycrystalline iron under combined tensile-torsion deformation

Abstract

For polycrystalline iron wires deformed torsionally by the method ofKovács andNagy [1] using different axial tensile stresses an elongation in the wires was observed. As the magnitude of the applied tensile stress was increased, the relative change of the tensile strain per unit torsion deformation increased too. Such increase was found to depend on both the temperature and the grain diameter. This behaviour was interpreted on the basis of a cross-slip hardening mechanism.