Phenomenon of Instantaneous Work Hardening Characteristics of Sintered Cold Deformed Cu Alloy Preforms

Abstract

Work hardening behavior is an important phenomenon especially when a material is subjected to cold work. The two important parameters that expose this study are strain hardening exponent, n, and strength coefficient, K, according to ludwik equation, σ=Kε^n. In addition to strain as influencing factor for work hardening behavior, the attained density during deformation is also considered in the present investigation; a rational approach and its characteristic evaluation has been proposed. Thus a copper alloy preforms of three different aspect ratios prepared using conventional powder metallurgy method and a secondary deformation such as cold deformation were carried out till maximum density or fracture appears at the outer surface of deforming preforms. The dimensional and density measurements were carried out carefully and the same is utilized to explain the instantaneous work hardening behavior with respect to induced strain and attained density.