Irradiation hardening behavior of polycrystalline metals after low temperature irradiation

Deformation mode maps for tensile deformation of neutron-irradiated structural alloys

“…That simple explanation is now confounded by the observation herein that the dose range 0.01-0.1 dpa also coincides with a profound change in deformation mode to one dominated by prompt plastic instability at yield, initiated by DCD. A similar change in deformation mode at these doses has recently been found in a number of ferritic steels [45,47], including tempered martensite which has a similar microstructure to our tempered A533B steel, and in various pure metals [48]. Thus the reduced exponent of irradiation hardening at higher doses deduced from measurements of changes in tensile yield strength might be due to a change in deformation mode, which might also be associated with the reduction in production rate of RDS.…”

Dependence of Dose and He on Irradiation-Hardening of Fe-Ion Irradiated Fe–8Cr Model Alloy

“…3. The dose dependence for this alloy in the present study showed good agreement with a simple power law expression, 8) ¦H £ (dpa) n , where dpa is the irradiation dose, which can be replaced by a factor related to defect cluster barriers, or by the radiation fluence. It is clear that there was a reduction in the slopes of log-log plots with decreases in the irradiation temperature.…”

Effect of irradiation-induced plastic flow localization on ductile crack resistance behavior of a 9%Cr tempered martensitic steel

“…The occurrence of plastic flow localization was extensively investigated by Byun and co-workers [6][7][8][9][10][11][16][17][18][19]. By analyzing a number of materials, irradiation and testing conditions, they proposed a common stress criterion for plastic instability corresponding to the true stress at necking.…”

“…Indeed, in these bands, defect clearing by the initial unpinned dislocations provides paths of easy glide for subsequent dislocations, promoting therefore a localized plastic deformation. This phenomenon was observed in bcc, fcc and hcp metals [2,[5][6][7][8]. A number of investigations are being devoted to this phenomenon [6][7][8][9][10][11][12][13][14][15], from both macroscopic and microscopic aspects, i.e., tensile testing and transmission electron microscopy (TEM), respectively.…”

“…Before giving the experimental conditions, it is important to note that irradiation-induced plastic flow localization was long associated with low temperature embrittlement where typically a very significant hardening is observed when the irradiation temperature is below $250°C [7,8,29]. However, plastic strain localization is also found at higher irradiation temperature, 300°C for example, although not as spectacular as observed in the low temperature range.…”