SHEAR CREEP TESTING OF COPPER SINGLE-CRYSTALS

The work tests an application of a single-shear creep technique of dou ble-notch specimens of Dupeux and Rouault-Rogez (in Strength of Materi als., edited by H. Oikawa el al., The Japan Inst. of Metals, 1994, pp. 681-685) to copper single crystals. Direct measurement of the specime n dimensions, finite element computation and surface metallography con firm that the strain is strongly localized in the sheared zone and the shear strain is pronounced. A creep test of a double-notch specimen i s compared with a usual compression creep test. Observation of the str ucture identifies slip lines of compact and of non-compact slip planes and a complicated dislocation structure with a high dislocation densi ty. (C) 1997 Elsevier Science S.A.