In magnesium neutron-irradiated at 4.2 OK the defect production and the subsequent recovery up to 360 OK were studied by means of electrical resistivity measurements. Additional experimental evidence is presented from preliminary stored energy, internal friction, and electron microscope studies on neutron-irradiated magnesium, and from electrical resistivity measurements on electron-irradiated magnesium. The principal recovery peak occurs between 90 and 160 OK.On a irradi6 du magn6sium par des neutrons A, 4.2 O K et BtudiB la creation et la restauration de dbfauts oristallins par des mesures de rBsistivit6 Blectrique. Nous presentons Bgalement des r6sultats preliminaires des Btudes de l'hergie emmagazinhe, du frottement intern, et de la microscopie Blectronique sur du magnBsium irradiB aux neutrons, et des mesures de la rbsistivitb Blectrique du magnBsium irradiB aux Blectrons. Le stade principal de la restauration apparait entre 90 et 160 OK.

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a)l), and G . VOGL (b) I n beryllium neutron irradiated at 4.2 OK, the defect productionand subsequent recovery up to 350 OK have beenstudied by means of electrical resistivity measurements. The data are discussed in view of our present knowledge on point defect phenomena in other metals, in particular aluminium, which exhibits after neutron irradiation a similar recovery behaviour as beryllium.On a irradie du beryllium par des neutrons h4,2 O K et 6tudiB la creation et la restauration de defauts cristallins par des mesures de rksistivite electrique. On discute les resultats B la lumibre de notre connaissance actuelle sup les phbnomhes diis aux defauts ponctuels dans d'autres metaux, en particulier l'aluminium, dont l'allure de la restauration a p r b irradiation aux neutrons est semblable $. celle du beryllium.

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