Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: Combined in situ neutron diffraction and acoustic emission

Muránsky, Ondrej; Barnett, Matthew; Carr, David G.; Vogel, Sven C.; Oliver, E.C.

doi:10.1016/j.actamat.2009.10.057

Cited by 181 publications

(89 citation statements)

References 53 publications

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“…Hence, in the axial (Q 99 ) detector bank are detected grains with the {hk.l} 99 plane-normals oriented along the loading axis, while in the radial detector bank are detected grains with {hk.l} 99 plane-normals oriented perpendicular to the loading axis. The detectors coverage in the Q direction is half of the detectors' angular spread in the horizontal plane (i.e., 781) and nearly equal to the angular coverage out of this plane (i.e., 7181) [16], see detector windows shown in Fig. 4.…”

Section: Instrumentmentioning

confidence: 99%

“…9 it can be further seen that there is also a considerable decrease in the diffraction intensity of the {20.1} 99 reflection in samples loaded along the axis 01 and 22.51 from rolling direction (RD), this suggests some twinning activity also in the {20.1} 99 grains. (Note, that these grains also have a high Schmid factor (0.45) for tensile twinning mode, but the newly formed twin grains originating from the parent {20.1} 99 cannot be detected with the current diffraction geometry [16].) It is further important to point out that the lattice strain relief in {00.2} 99 lattice strain associated with the onset of twinning in the {10.0} 99 grains does mean that the initially present {00.2} 99 grains commenced to yield.…”

Section: Evolution Of Lattice Strains and Diffraction Intensitiesmentioning

confidence: 99%

“…5) with scattering vectors (Q) aligned axially (Q 99 ) and radially (Q ? ) to the loading axis [16], hence axial (Q 99 ) and radial (Q ? ) detector banks.…”

Section: Instrumentmentioning

confidence: 99%

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Load partitioning and evidence of deformation twinning in dual-phase fine-grained Zr–2.5%Nb alloy

Muránsky¹,

Daymond²,

Bhattacharyya³

et al. 2013

Materials Science and Engineering: A

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tIn situ neutron diffraction loading experiments were carried out on a cold-rolled dual-phase (a-phase, $ 10% b-phase) Zr-2.5%Nb alloy at room temperature. The specimens were cut at different angles from the rolling direction (RD) towards the transverse direction (TD), thus the loading axis changes gradually from the rolling to transverse direction. Due to the strong texture of the studied alloy, and unidirectional nature of deformation twinning, the changing loading direction with respect to initial texture has a significant impact on the collaborative slip-twinning deformation mode in the hexagonal close-packed (hcp) a-phase. The present neutron diffraction results provide direct evidence of {1 À 1.2}/1 À 1. À 1S ''tensile'' twins in the a-phase of dual-phase Zr-2.5%Nb alloy at room temperature.Additionally, TEM analysis was employed to confirm the presence of ''tensile'' twins, and determine if other type of twins were present. It is further clear from the neutron diffraction results that applied load is gradually transferred from the plastically softer a-phase to the plastically harder b-phase which acts as a reinforcing phase having a yield strength in the range 750-900 MPa depending on the loading direction.

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Section: Instrumentmentioning

confidence: 99%

Section: Evolution Of Lattice Strains and Diffraction Intensitiesmentioning

confidence: 99%

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Load partitioning and evidence of deformation twinning in dual-phase fine-grained Zr–2.5%Nb alloy

Muránsky¹,

Daymond²,

Bhattacharyya³

et al. 2013

Materials Science and Engineering: A

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“…In situ neutron diffraction experiments have been employed extensively to study the plastic deformation behavior of magnesium alloys. The technique provides information on the distribution of internal stresses and strains among the various crystallographic orientations, as well as on bulk texture evolution caused by twinning [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Twinning-Detwinning Behavior during Cyclic Deformation of Magnesium Alloy

Lee

Wang

Gharghouri

2015

Metals

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Abstract:In situ neutron diffraction has been used to examine the deformation mechanisms of a precipitation-hardened and extruded .%Al alloy subjected to (i) compression followed by reverse tension (texture T1) and (ii) tension followed by reverse compression (texture T2). Two starting textures are used: (1) as-extruded texture, T1, in which the basal pole of most grains is normal to the extrusion axis and a small portion of grains are oriented with the basal pole parallel to the extrusion axis; (2) a reoriented texture, T2, in which the basal pole of most grains is parallel to the extrusion axis. For texture T1, the onset of extension twinning corresponds well with the macroscopic elastic-plastic transition during the initial compression stage. The non-linear macroscopic stress/strain behavior during unloading after compression is more significant than during unloading after tension. For texture T2, little detwinning occurs after the initial tension stage, but almost all of the twinned volumes are detwinned during loading in reverse compression.

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“…microscopy methods, electron backscattered diraction (EBSD), X-ray diraction line prole analysis). In situ techniques, such as acoustic emission [8], digital image correlation [9] or X-ray and neutron diraction (ND) measurements [10] during deformation tests have been successfully used for the determination of twinned volume in dierent magnesium alloys. Nevertheless, there are only few, recent papers dealing with the in situ investigation of the dislocation structure by ND method [11,12], providing the largest statistical ensemble, particularly for coarse grained materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

et al. 2015

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The evolution of the dislocation structure in randomly textured cast magnesium as a function of loading mode is studied using whole neutron diraction pattern line prole analysis and elasto-plastic self-consistent modeling. Both the experimental results and the theoretical data indicate the onset of basal slip at low stresses and the key role of prismatic slip in the macroscopic yield. Dependence of the second-order pyramidal slip on the loading mode is revealed.

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Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: Combined in situ neutron diffraction and acoustic emission

Cited by 181 publications

References 53 publications

Load partitioning and evidence of deformation twinning in dual-phase fine-grained Zr–2.5%Nb alloy

Load partitioning and evidence of deformation twinning in dual-phase fine-grained Zr–2.5%Nb alloy

Twinning-Detwinning Behavior during Cyclic Deformation of Magnesium Alloy

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

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