Atomistically informed crystal plasticity model for body-centered cubic iron

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

“…The results for τ χ c are shown in Figure 4 as a function of χ and σ , with τc , a 1 , 9 a 2 , and a 3 given in Table 1. It is worth noting that the relation between τ χ c and σ has been established for tensile nonglide stresses only (σ ą 0), for consistency with the linear dependence used in the work of Vitek and collaborators (Gröger et al, 2008a,b) that has been used in other crystal plasticity works (Koester et al, 2012). However, nothing precludes the use of nonlinear fitting functions that capture both the tensile and compressive regimes simultaneously (cf.…”

“…Modeling thermally-activated flow and non-Schmid effects in bcc systems has been the subject of much work, starting in the 1980s and, particularly, in recent times. Different authors have considered different subsets of the t110u, t112u, and t123u families of glide planes, without (Raphanel & Van Houtte, 1985;Hölscher et al, 1991Hölscher et al, , 1994Raabe et al, 1994;Raabe, 1995a,b;Peeters et al, 2000;Stainier et al, 2002;Erieau & Rey, 2004;Ma et al, 2007;Hamelin et al, 2011;Kitayama et al, 2013) and with non-Schmid effects (Lee et al, 1999;Kuchnicki et al, 2008;Koester et al, 2012;Weinberger et al, 2012;Alankar et al, 2014;Lim et al, 2013;Narayanan et al, 2014;Patra et al, 2014;Knezevic et al, 2014;Lim et al, 2015a,b). Of particular interest are some recent simulations where the flow rule is directly formulated on the basis of screw dislocation properties in Fe (Yalcinkaya et al, 2008;Koester et al, 2012;Alankar et al, 2014;Narayanan et al, 2014;Patra et al, 2014;Lim et al, 2015b), Ta (Kuchnicki et al, 2008;Lim et al, 2013;Knezevic et al, 2014;Lim et al, 2015a), Mo (Yalcinkaya et al, 2008;Weinberger et al, 2012;Lim et al, 2013Lim et al, , 2015a, W (Lee et al, 1999;Weinberger et al, 2012;Lim et al, 2013;…”

Evaluating the effects of loading parameters on single-crystal slip in tantalum using molecular mechanics

“…It has been found that asymmetry in the dislocation core relative to loading orientation produces an asymmetry in the stress required to move the dislocation [16]. More recent work has extended the analysis of dislocation behaviour with atomistic studies as in, for example, [17].…”

Microcompression of brittle and anisotropic crystals: recent advances and current challenges in studying plasticity in hard materials

“…In BCC metals, fundamental aspects of dislocation core structure, stress tensor dependence, and resulting non-Schmid behavior, are also still under investigation. [5,6] However, in all of these materials, the availability of large-grained or single crystals with sufficient purity has scarcely been a problem, nor has the ability to deform such samples under carefully controlled conditions. Suitable investigations by conventional, analytical and high-resolution microscopy techniques have also been carried out whenever new methods have allowed researchers to dive deeper into the physics of their plastic deformation.…”