Modeling tensile response and flow localization effects in selected copper alloys

The role of deformation mechanisms in flow localization of 316L stainless steel

“…This observation is consistent with the previous investigation by Pan et al [3]. It is also noteworthy that the difference between the yield strength and the critical stress is nearly uniform in the temperature range between 200 and 400°C, consistent with the observed plateau in the tendency for flow localization in this temperature range.…”

“…Recent work [1][2][3] shows the existence of a critical stress for the flow localization of face-centered cubic metals and alloys. This critical stress is a direct consequence of the post yield hardening properties of the materials, which seem to be independent of irradiation conditions.…”

“…This process is characterized as flow localization. Due to its importance in many applications, numerous studies have been performed to investigate the relationship among ductility loss, radiation-induced [1][2][3] show that regardless of the irradiation level, the true stress for the onset of plastic instability (necking) is approximately constant, defined as the 'critical stress'. In other words, the true stress to failure is an inherent material property rather than a function of irradiation-induced defect microstructure or strain hardening behavior.…”

Physical and Mechanical Properties of Copper and Copper Alloys

“…68,69 However, postirradiation annealing also reduces the critical stress for flow localization in pure copper. 70 Irradiation creates a large increase in strength and decrease in ductility in copper alloys for irradiation temperatures below 300 C. The strengthening effect decreases with increasing temperature. The crossover to radiation softening occurs at approximately 300 C. The radiation softening effect in CuAl25 alloy is not as strong as for CuCrZr alloy where precipitate stability may be an issue.…”

Analysis of notch strengthening of 316L stainless steel with and without irradiation-induced hardening using EBSD and FEM

“…However, after exposure to irradiation in the temperature range from 150 to 400°C, material ductility is severely reduced [7][8][9][10][11]. Despite large changes in yield strength due to irradiation exposure, it is found [12][13][14][15] that the true stress at the onset of necking is a constant regardless of the irradiation levels. Thus, as the yield strength rises with irradiation exposure, the material ability to undergo distributed flow is limited by the increasing small difference between the yield and critical stresses.…”