Résumé. 2014 Des essais de compression à vitesse constante (03B5 ~ 6 x 10-5 s-1) ont

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Berg–Barrett topography gives information on large‐scale dislocation distribution in deformed single crystals. The Burgers vectors are determined by disappearance of the dark `extinction contrast'. This contrast cannot be extinguished by any single diffracting condition when different types of non‐coplanar Burgers vectors are present simultaneously; complementary information by electron transmission microscopy agrees well with this inference. These general remarks are illustrated by some examples on deformed single crystals of α‐Al2O3, (Al2O3)1.8MgO, NaCl and Cu2O.

[3,5]. The plastic anisotropy is compared to other ionic compounds and the hardening mechanism are discussed based on mechanical data.Revue Phys. Appl. 21 (1986) 87-92 FÉVRIER 1986, Classification Physics Abstracts