Heterogeneous deformation of Al single crystal: Experiments and finite element analysis

Abstract

This work combined experiments at the grain level with the constitutive modeling of a single crystal to investigate deformation behaviors of a pure aluminum single crystal oriented for a single slip. Simple compression of a [132] single crystal was conducted to obtain the macroscopic stress—strain response and observe the deformed shape of the sample. The evolution of the crystallographic orientation was measured by an electron backscattered diffraction system in a field emission scanning electron microscope. The heterogeneous in-plane surface deformation in a single crystal was calculated by using a digital image correlation technique. Finite element modeling based on a single crystal plasticity model agrees well with experimental results in an averaged sense, not at the individual dislocation level.

Macrosegmentation and strain hardening stages in copper single crystals under compression

“…Even if special precautions were made to provide free displacement of samples in machine's grips the strain pattern in the subsurface of contact areas differs from that of the sample's bulk. That such is true has been shown both by the results of our experiments reported by Lychagin, (2006), Lychagin et al (2006Lychagin et al ( , 2011 and by the results of other researchers who studied strain in single crystals using a digital image correlation technique (Raabe et al, 2001(Raabe et al, , 2003Zhao et al, 2008;Roters et al, 2010;Magid et al, 2009;Ha and Kim, 2011;Florando et al, 2007).…”

A model for elastic–viscoplastic deformations of crystalline solids based on material symmetry: Theory and plane-strain simulations

“…This decomposition, though widely adopted [1][2][3][4], has been criticized on the grounds that for finite deformations it cannot be associated with a sequence of simple shears unless these are restricted in a certain manner [5]. In particular, the order of the sequence generally affects the overall plastic deformation, a fact which is not reflected in (1).…”

Mechanical Aspects of Nonhomogeneous Deformation of Aluminum Single Crystals under Compression along [100] and [110] Directions

“…The extensive literature reveals a tendency of loaded single crystals towards strain localization and fragmentation [10,11,17,20,22,24,[31][32][33][34][35][36]. The former is related to the crystal's ability to accumulate slip in narrow band-like zones whose orientation is independent of the crystal lattice orientation [10,11,[36][37][38][39][40]. This kind of plastic instability referred to as non-crystallographic shear banding is particularly pronounced in FCC crystals with low stacking fault energy [39,40].…”