It was recalled that, in an alloy which was strengthened by long-range ordered particles, a matrix dislocation generated an antiphase boundary when it cut such a particle. The specific energy of this antiphase boundary was measured for face-centered cubic Al-7.5at%Li alloy which contained spherical coherent L12 ordered particles. Peak-aged specimens were deformed, and Orowan loops were sought by using transmission electron microscopy. The antiphase boundary energy was deduced from the radii of the smallest dislocation loops which were left behind particles. An improved evaluation method was applied which was based upon the results of computer simulations of the equilibrium configurations of dislocation loops.

Derivation of the Antiphase-Boundary Energy of L12 Long-Range-Ordered Precipitates from Measurements of the Minimum Size of Stable Dislocation Loops. D.Baither, V.Mohles, E.Nembach: Philosophical Magazine Letters, 2001, 81[12], 839-47