An analysis was made of the elastic fields of dislocation loops, having the form of parallelograms or rectangles, in which the basic element was a pair of [1¯10] line segments in the original face-centered cubic phase. It was found that, in these fields, more possibilities existed for invariant-plane deformations to take place than in the elastic field of an individual dislocation. This was because the latter varied significantly with changes not in polar angle and spatial coordinates. The likely cause of a change in the habits of martensite, from (557) to (225), was considered within the concepts of the heterogeneous nucleation and wave growth of martensite near to a dislocation loop. The nucleation of crystals having a (225) habit was associated with an elastic field region with a local maximum in the relative change of volume.

Nucleation of α-Martensite Crystals with (hhl) Habits in the Elastic Fields of Dislocation Loops. M.P.Kashchenko, A.V.Nefedov, V.P.Vereshchagin, V.V.Letuchev: Physics of Metals and Metallography, 1998, 85[4], 392-402