Comparison between hardening mechanisms due to tension and combined torsion—tension deformation in α-brasses

Abstract

A correlation is made between two aspects of deformation, pure tension and combined torsion—tension, in α‐brasses of different zinc content. The adopted measures for the degree of deformation are slip distance (L) for tension deformation, and stress rate per unit torsion (S) for combined torsion—tension. These two quantities are found to be interrelated with working temperature (T) as a variable parameter by the empirical equation S/L = −0.027T + 26.8 which shows that when the temperature is raised the rate of recovery in α‐brasses hardened by tension deformation is faster than that in those hardened by combined torsion—tension deformation.

A study of annealing stages in commercial pure Cu using mechanical measurements and positron annihilation lifetime technique

“…The degree of torsion deformation was measured [3] by the dimensionless quantity ND/L 0 where N being the number of twist turns, D is the wire diameter (0.5 mm), and L 0 is the original wire length (50 mm). During twisting the tested wire, was axially loaded by tensile stress (not more than one-third of the yield point) to prevent the bending (buckling) of the sample [13]. The variation in length accompanied by the torsion-tension deformation was measured by a travelling microscope with accuracy up to 10 −2 mm.…”