Electron backscatter diffraction pattern analysis of the deformation band formed in the Mg-based long-period stacking ordered phase

Hagihara, Koji; Okamoto, Takuya; Yamasaki, Michiaki; Kawamura, Yoshihito; Nakano, Takayoshi

doi:10.1016/j.scriptamat.2016.02.016

Cited by 35 publications

(18 citation statements)

References 33 publications

(46 reference statements)

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“…5(b). 25) That is, in many cases, two deformation bands are simultaneously formed, and their combination develops the beak-like morphology. They macroscopically propagate along a direction perpendicular to the basal plane but exhibit a wavy shape only on (0001).…”

Section: Resultsmentioning

confidence: 99%

“…The observed specimen was deformed in the 30°orientation to ³5% plastic strain. (b) Three-dimensional structure of the deformation band speculated in a previous study that analyzed a specimen deformed in the 0°orientation 25). Typical IPF maps showing the variation in the crystal orientation caused by the formation of deformation bands in specimens deformed in the (a) 10°, (b) 20°, (c) 30°, and (d) 40°orientations…”

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confidence: 95%

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Loading Orientation Dependence of the Formation Behavior of Deformation Kink Bands in the Mg-Based Long-Period Stacking Ordered (LPSO) Phase

et al. 2020

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The variation in the deformation behavior of a directionally solidified (DS) Mg-based long-period stacking ordered (LPSO)-phase crystal depending on the loading orientation was examined. The frequency of formation of the beak-like shape of the deformation band, which is known as one of the important deformation mechanisms in the LPSO phase, monotonically decreased as the inclination angle of the loading orientation with respect to the crystal growth direction in the DS crystal increased, and was accompanied by a decrease in the yield stress due to the activation of basal slip. Deformation bands formed along a direction approximately perpendicular to the grain boundary independent of the loading orientation. The crystal rotation axes selected in the deformation bands were perpendicular to [0001] in almost all grains, independent of the loading orientation. However, the rotation axes in the bands were not fixed but varied between h10 10i and h11 20i; this variation was correlated with the loading axis. These observed features strongly suggest that the deformation bands formed in the LPSO phase are predominantly deformation kink bands and that the formation mechanism itself does not vary with the loading orientation but instead its details. The selectivity of the crystal rotation axis in the kink band is strongly affected by the loading orientation.

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Section: Resultsmentioning

confidence: 99%

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confidence: 95%

Loading Orientation Dependence of the Formation Behavior of Deformation Kink Bands in the Mg-Based Long-Period Stacking Ordered (LPSO) Phase

et al. 2020

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“…Flouriot et al [58] have also noted kink bands formation in crack-tip field simulations in a FCC crystal that are similar to those observed with crack-tip field measurements in ductile crystals [10]. As in this two situations, kink bands observations are mostly 270 reported where strong strain incompatibilities arise such as crack-tip fields, compression of HCP single crystals [7] or deformation of strongly anisotropic HCP polycrystals [8,4,5] mainly deforming through basal slip. In those cases, crystal plasticity models appears to be well-suited to simulate their formation.…”

Section: Sensitivity To Simulated Volume Elementmentioning

confidence: 54%

“…Another type of slip localization band observed in deformed crystals, associated with high lattice rotation and orthogonal to the glide direction, is the so-called kink band. Kink bands are reported as a late deformation mode of metallic single crystals [1,3], in strongly anisotropic hexagonal crystals such as ice or Zinc [4,5,6,7,8], as a crack-tip localization mode [9,10,11] or for titanium alloys under high strain rate deformation [12]. Asaro and Rice bifurcation analysis [13] showed that in presence of strain softening the constitutive equations of crystal plasticity can predict both localization modes, and a few authors have studied the formation of kink 15 bands in crystal plasticity simulations [14,15,16,5].…”

Section: Introductionmentioning

confidence: 99%

Intragranular localization induced by softening crystal plasticity: Analysis of slip and kink bands localization modes from high resolution FFT-simulations results

2019

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We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization observed experimentally in metals exhibiting softening mechanisms. A generic strain softening model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. It is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities with classical crystal plasticity models, as they do not account for their actual physical differences. As a result they predict the formation of a large amount of kink bands, whereas experimental observations of strongly softening metals (such as irradiated metals) seldom report them.

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“…However, it is evident that in addition to wedge disclinations, mixed disclinations can be formed in the connecting kinks in general. A kink band that has curved habit plane and inhomogeneous rotation 20) may be the results of successive connection of kink bands and may have sequence of mixed disclinations. Therefore, much attention should be paid to w andm not only for connecting kink bands but also in a single kink band.…”

Section: Existence Of Twist and Mixed Disclinationsmentioning

confidence: 99%

Rank-1 Connection of Kink Bands Formed by Non-Parallel Shears

Inamura

Shinohara

2020

Mater. Trans.

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The geometry of kink bands with the general shear direction on the unique slip plane was formulated and the connection between two kink bands formed by non-parallel shears on the slip plane was examined using rank-1 connection. For a kink deformation in a metal with a hexagonal lattice, we derived an equation that decomposes the general shear direction into two ©aª basal slips. The rotation axis of the misorientation of kink band moves away rapidly from h0 " 110i to h1 " 210i as the second ©aª basal shear component increased. We proved that any two kink bands formed by non-parallel basal shears can be rank-1 connected to each other. In addition to the wedge disclination, a mixed disclination at the junction of two kink bands formed by non-parallel basal shears was found.

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Electron backscatter diffraction pattern analysis of the deformation band formed in the Mg-based long-period stacking ordered phase

Cited by 35 publications

References 33 publications

Loading Orientation Dependence of the Formation Behavior of Deformation Kink Bands in the Mg-Based Long-Period Stacking Ordered (LPSO) Phase

Loading Orientation Dependence of the Formation Behavior of Deformation Kink Bands in the Mg-Based Long-Period Stacking Ordered (LPSO) Phase

Intragranular localization induced by softening crystal plasticity: Analysis of slip and kink bands localization modes from high resolution FFT-simulations results

Rank-1 Connection of Kink Bands Formed by Non-Parallel Shears

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