Incorporating interface affected zones into crystal plasticity

Abstract

This work presents a crystal plasticity modeling framework that accounts for the influence of material interfaces on the plastic behavior of the two crystals on either side of the interface. Within an interfaceaffected zone (IAZ) extending from both sides of the interface, slip system activity is presumed to be biased towards systems that permit slip transfer across the interface. The preferred slip transfer pathways are determined from the geometric alignment of the slip systems and the stress state within each crystal. The IAZ model is applied to study the plastic stability of Cu-Nb bicrystals under plane strain compression. Our results show that the additional constraints imposed through the enforcement of slip continuity across the interface leads to reduced plastic stability as compared to the case without an IAZ for several of the interfaces studied.

Bulk texture evolution of nanolamellar Zr–Nb composites processed via accumulative roll bonding

“…9(e). of slip transmission on texture evolution [88]. Clearly more effort in this area of interface-driven slip activity and texture evolution is needed.…”

Review on slip transmission criteria in experiments and crystal plasticity models

“…Thereby, the geometric factor is connected to the RSSes. In the work of [66], (6) is used to penalize slip transfer on geometrically unfavorable slip system combinations across bimetallic interfaces by increasing the corresponding slip resistances depending on the mismatch. The modified slip resistance enters the flow rule and, thus, connects the geometrical factors to the RSSes in the flow rule.…”

“…Whenever the material response is of singlecrystalline type [63] or at least polycrystalline such that individual grains are not predominant [64], regarding the effective material response, continuum approaches are valuable to use since the microstructure of the material does not need to be accounted for, explicitly. In cases when microstructural characteristics of the material become predominant, continuum models need to be enriched by additional considerations, like the incorporation of strain gradients [65] and explicit modeling of the influence resulting from interfaces, e.g., in bimetallic materials [66]. Modeling grain boundary mechanisms is an ongoing challenge in the development of continuum models and has been approached, e.g., by the development of gradient crystal plasticity theories, e.g., [67][68][69].…”

“…Related articles commonly include a brief overview on selected works from the experimental literature (see for example [31,49,66,89]). A comprehensive overview, however, that includes all geometrical slip transmission criteria in a unified and compact notation to ease the comparability of the geometrical concepts is still missing in the literature to date.…”

Crystal plasticity extend FEM implementation of thermal-tensile aluminum alloy

“…Therefore, more complicated model are needed to describe these effects, and the constitutive laws are generally revised to satisfy more complicated cases. As for thermal effects, a visco-plastic self-consistent (VPSC) model is generally used to homogenize the polycrystal and calculate the mechanical behaviour as a function of strain rate and temperature [6]. This advanced mean-field scheme is able to simulate the temperature field coupled with mechanical field, but still lack of capturing codeformation within grains.…”