Low Temperature Neutron Radiation Damage and Recovery in Magnesium

Abstract

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.

Towards quantitative inference of nanoscale defects in irradiated metals and alloys

“…2(a). Additionally, several studies have correlated resistivity to stored energy measurements in order to validate the change in defect concentration [38][39][40][41][42]. Resistivity measurements have also been used to evaluate the effect of solutes on the recovery of radiation damage, including studies on C-doped Fe [43] and Fe-Cr [44].…”

“…After Eugene Wigner first postulated that energy could be stored in metals as irradiation-induced defects [95], many works investigated defect recovery at cryogenic temperatures. These include studies on Cu [42,96,97], Al [39], Mg [40], and Be [41]. Often the focus of these works was the fundamental science behind primary radi-ation damage production, rather than investigating defect evolution at engineering-relevant temperatures.…”

Towards Quantitative Inference of Nanoscale Defects in Irradiated Metals and Alloys

“…These experiments can be coupled to kinetic Monte Carlo (kMC) simulations (Fu et al, 2004;Fluss et al, 2004) of the defect evolution to gain insight into the precise recovery mechanism, shown in Figure 2A. Additionally, several studies have correlated resistivity to stored energy measurements in order to validate the change in defect concentration (Kinchin and Thompson, 1958;Isebeck et al, 1966;Delaplace et al, 1968;Nicoud et al, 1968;Losehand et al, 1969). Resistivity measurements have also been used to evaluate the effect of solutes on the recovery of radiation damage, including studies on C-doped Fe (Takaki et al, 1983) and Fe-Cr (Gómez-Ferrer, 2016).…”

Frottement intérieur d'un magnésium de haute pureté déformé plastiquement

“…Les deux pics a 105 et 220 K ont plutot les caracteristiques des pics de Hasiguti [13] (dus a une interaction defauts ponctuels intrinseques-dislocations) et semblent correspondre respectivement aux pics PA et PB de 1'aluminium. Le defaut responsable du pic a 105 K est probablement un defaut de type interstitiel, ces defauts migrant en-dessous de 100 K environ [12]. Le pic a 220 K peut etre associe soit a des amas d'interstitiels (comme pour le pic PB de 1'aluminium [13]), soit a des defauts lacunaires, le domaine de temperature considere correspondant a leur migration [12].…”

“…Le defaut responsable du pic a 105 K est probablement un defaut de type interstitiel, ces defauts migrant en-dessous de 100 K environ [12]. Le pic a 220 K peut etre associe soit a des amas d'interstitiels (comme pour le pic PB de 1'aluminium [13]), soit a des defauts lacunaires, le domaine de temperature considere correspondant a leur migration [12].…”