Some Considerations in Interviewing the Old, Old

Drawing upon personal experiences, the author makes a number of suggestions to follow when interviewing those in their late seventies and above. He deals with such topics as pitfalls in obtaining interviews, dress, rapport, length of interview, allaying respondents' fears, and coping with communication problems caused by interviewees' visual and hearing losses

Strengthening of copper by dislocation substructures

Substructural strengthening in pure copper deformed by cold rolling is shown to depend on both the mean free path and the level of nonuniform strain associated with the dislocation substructure. Contributions from the nonuniform strain are particularly important because the mean free path becomes constant after deformations of ∼50 pct R.A., whereas the material continues to work harden. The behavior of the nonuniform strains at large deformations is also found to be closely related to dynamic recovery. Development of an empirical expression for the strengthening in terms of the substructural parameters is shown to lead to a modified Hall-Petch type relation. © 1977 The Metallurgical Society of American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc