Orientation dependence of yield stress in 4.4% silicon iron single crystals

Thermal Desorption Analysis of Hydrogen in High Strength Martensitic Steels

“…Larger dislocation densities were assumed in the calculation than in the simulation of hydrogen trapping, because carbon was thought to be trapped by not only edge dislocations but also screw dislocations, [25,26] and the screw dislocation constitutes a larger proportion of dislocations introduced by deformation in bcc Fe. [27] It is seen in the figure that the number of segregated carbon atoms level off in a relatively short time at larger dislocation densities. The number of octahedral interstitial sites within the distance b from a [112] edge dislocation was evaluated to be 3 to 4.…”

Unraveling the temperature dependence of the yield strength in single-crystal tungsten using atomistically-informed crystal plasticity calculations

“…This is owed to both specific crystallographic properties of the bcc lattice structure as well as to the coupling between the dislocation core and non-glide components of the stress tensor, which -to the best of our understanding-is unique to bcc crystals (Bulatov et al, 1999;Brinckmann et al, 2008;Woodward & Rao, 2001;Chaussidon et al, 2006;Gröger & Vitek, 2005). These anomalies have been the subject of much research and discussion going back to the 1960's (Takeuchi et al, 1967;Hull et al, 1967;Duesbery, 1969;Duesbery & Foxall, 1969), both experimentally and -more recently-using computational atomistic models.…”

Fundamental Understanding of Ambient and High-Temperature Plasticity Phenomena in Structural Materials in Advanced Reactors

“…There is no systematic experimental data available to compare to our model predictions. However, experiments [253,254] have shown that tension-compression asymmetry is indeed prevalent in similar Fe-Si alloys, which have dominant non-Schmid effects. Figure 46.…”