Constant stress creep tests are performed on KBr single crystals in the range 0.65 to 0.94Tm and 80 to 140 p/mm2. The activation energy for creep is determined as a function of temperature by incremental temperature tests and is found to be independent of stress.At high temperatures (0.74 to 0.94Tm) the activation energy is found to be Qc = (1.43 * 0.13) eV while a t intermediate temperatures (0.65 to 0.74Tm) &, = (0.88 5 0.08) eV.The first value is very close to the self-diffusion activation energy of the Br ion. It is suggested that the lower value corresponds to the activation energy for pipe diffusion along dislocation cores. The stress exponent n in the expression for the steady state strain r a k is measured and found to be (5.3 0.3). These results indicate that the creep behavior of KBr single crystals and that of pure metals are similar, and that the rate-controlling mechanism is probably related to dislocation climb. Des essais de fluage ont Btb effectuBs Bur des monocristaux de KBr dam l'intervalle de 650 i 940 K et de 80 & 140 p/mm2. L'bnergie d'activation de fluage a 6th determinke en une fonction de la tempbratwe, en essais avec accroissements de temperature et on a trouvb qu'elle est independante de la contrainte. Pour hautes tempbratures (740 940 K) l'bnergie d'activation a 6th Q, = (1,43 & 0,13) eV, tandis que pour bempbratures intermediaires (650 it 740 K) &, = (0,88 f 0,08) eV. La premiere valeur est trks prochaine & celle de l'bnergie d'activation pour l'autodiffusion des ions Br. On sugbre que la plus petite valeur correspond B l'bnergie d'activation pour la diffusion le long de dislocations. On a mesure I'exposant rn de la contrainte dans l'expression de la vitesse de deformation en regime permanent, la valeur trouvQ a Btb de (5,3 * 0,3). Ces rBsultats laissent & penser que les comportements, dans le oas de fluage des monocristaux de KBr et des metaux purs sont semblables et que le mkchanisme qui contrdle le processus est relie probablement au monG des dislocations.
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