Open AccessA STUDY ON THE NATURE OF ANNEALING TWINS. Report for the Period June 15, 1962 to September 15, 1963
Author(s) -
J. R. Hancock,
K.L. Keating,
Denis J. Murphy
Publication year - 1964
Language(s) - English
Resource type - Reports
DOI - 10.2172/4140084
Subject(s) - crystal twinning , copper , annealing (glass) , materials science , grain boundary , condensed matter physics , period (music) , crystallography , metallurgy , physics , chemistry , acoustics , microstructure
An investigation was made on the properties and phenomenological behavior of noncoherent twin boundaries in copper and copper-base alloys. The investigation has shown the importance of considering the three-dimensional character of annealing twins and of the twinning processes taking place, and the effect of time and temperature, on twinning frequency. Noncoherent twin boundaries were shown to be relatively high energy boundaries extending through a crystal in the form of loops, which, at elevated temperatures, may migrate in either direction parallel to coherent twin boundaries. Migration was observed to occur in a stepwise, discontinuous manner. Noncoherent twin boundaries were moved thermo-mechanically under conditions of severe abrasive deformation, in which case they resembled their counterparts in mechanical twins. (auth