REVIEW OF POSITRON STUDIES OF THE ANNEALING OF THE COLD-WORKED STATE

This review will present examples of the application of positron annihilation to studies of cold work and annealing. For the most part the examples will not reveal new metallurgical facts per se, but rather will serve to introduce the metallurgist or materials specialist to a relatively new and possibly advantageous type of measurement which he (or she) may wish to apply to particular studies. The examples cited include ones from conventional cold rolling and annealing, oriented single crystal bending and subsequent polygonization, fatigue of ferrous and nonferrous materials, tensile work hardening of various grain size samples, electron radiation and annealing, shot peening, age hardening retardation by cold work and influence of the cold worked state upon hydrogen charging. The reader is referred to the preceeding article by Dr. K. G. Lynn for a more detailed explanation of the two positron techniques utilized in gathering the results described, namely positron lifetime measurements and Doppler broadening of the positron annihilation gamma ray energies. The author is indebted to the many former and current students and research associates whose work is to be described and who will be cited in the text at the appropriate times. © 1979 American Society for Metals and the Metallurgical Society of AIME.