A STUDY OF QUENCH-HARDENING IN SILVER.
Abstract
Silver wires of 10 mil diameter have been quenched from 900=15C at an average quenching rate of 100000C/sec. Isothermal aging kinetics have been investigated by means of room temperature 0.4 per-cent-yield-strength measurements. The incubation periods that were observed for the 300C, 400C, and 450C aging temperatures indicated that excess single vacancies formed di-vacancies and trivacancies which served as nuclei for the formation of hardening complexes. The maximum strength developed at these temperatures was 10.0 kg/sq mm and it is postulated that this strength resulted from the formation of dislocation loops and stacking fault tetrahedra. The 500C and 550C aging temperatures developed a yield strength of only 7.3 kg/sq mm and hardening at this aging temperature is assumed to be due to dislocation loops only. The activation energy for the 300C to 450C hardening mechanism was found to be 0.67 = .03 eV. This is the activation energy associated with the migration of single vacancies. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1962
- Accession Number
- AD0610236
Entities
People
- John Raymond Albright
Organizations
- Air Force Institute of Technology