THE EFFECT OF PRIOR DEFORMATION AND RECOVERY ON THE DEFECT CONCENTRATION INCREASE DURING PLASTIC DEFORMATION
Abstract
The parameter c, the concentration of impurity atoms and the initial condition of the metal, and the parameter n, a constant, were studied for the power equation delta rho equals c sigma to the nth power, where delta rho is the elongation increment associated with the change in resistivity. Resistivity measurements on Cu and Al were made before and after stretching the metal pieces to a predetermined strain. The increase in resistivity of copper with cold work obeys the power law. The exponent n and the constant multiplier c vary in Cu with the increase in the ratio of the new resistivity (rho') to the old resistivity (rho). This resistivity ratio represents the internal state of the copper. Both c and n decrease with the increase in the ratio and c is related linearly to n. The decrease in n results in a higher defect production rate initially, but later the rate falls below that observed for material with higher n. The recovery process appears to enhance the rate of defect production and thereby the work hardening rate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1962
- Accession Number
- AD0278265
Entities
People
- Howard R. Peiffer
Organizations
- Glenn L. Martin Company