1965/07/01 by B. L. Eyre, B.L. Eyre, R. Bullough
Engineering · Materials Science · #Fusion materials and technologies #Ion-surface interactions and analysis #Microstructure and mechanical properties
paper · doi:10.1080/14786436508224943
crossref issued 1965/07/01 · crossref published 1965/07/01 · crossref published-print 1965/07/01 · openalex publication_date 1965/07/01 · crossref created 2007/07/08 · crossref deposited 2016/12/17 · openalex created_date 2025/10/10 · crossref indexed 2026/07/24 · openalex updated_date 2026/07/29
Two types of interstitial loops with Burgers vector b = a/2<111> and b = a<100>, respectively, have been observed experimentally in irradiated b.c.c. metals. The present paper discusses how these loops can form from a common loop nucleus consisting of a single platelet of interstitials on a 110 plane. Such a loop contains a stacking fault which is removed by one of two shears described by the following dislocation reactions: It is suggested that the latter higher energy, <110> shear, requires thermal energy to assist it and therefore only occurs at elevated temperatures. Consideration is given to the elastic energy of the loops with particular reference to their shape and orientation. The calculations predict that the loops are initially rectilinear and as they grow they should change to the circular form and rotate into a pure edge orientation. The crystallographic symmetry of the a<100> loops and their growth mechanism probably explains the observed retention of the rectilinear form.