In Situ Measurement of Grain Rotation During Deformation of Polycrystals

Margulies, L.; Winther, Grethe; Poulsen, Henning Friis

doi:10.1126/science.1057956

Cited by 357 publications

(176 citation statements)

References 7 publications

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“…Nonetheless, it can be expected that these processes also occur in the bulk, which has been previously observed for bulk grains in aluminum during deformation [26]. Considering that the ferritic matrix is soft and the grains of austenite are hard, such rotations are also feasible in the bulk of the steel.…”

Section: Grain Rotation-induced Plasticitymentioning

confidence: 94%

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

et al. 2012

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Uniaxial straining experiments were performed on a rolled and annealed Si-alloyed TRIP (transformation-induced plasticity) steel sheet in order to assess the role of its microstructure on the mechanical stability of austenite grains with respect to martensitic transformation. The transformation behavior of individual metastable austenite grains was studied both at the surface and inside the bulk of the material using electron back-scattered diffraction (EBSD) and X-ray diffraction (XRD) by deforming the samples to different strain levels up to about 20%. A comparison of XRD-and EBSD-results revealed that the retained austenite grains at the surface have a stronger tendency to transform than the austenite grains in the bulk of the material.The deformation-induced changes of individual austenite grains before and after straining were monitored with EBSD. Three different types of austenite grains can be distinguished that have different transformation behaviors: austenite grains at the grain boundaries between ferrite grains, twinned austenite grains, and embedded austenite grains that are completely surrounded by a single ferrite grain. It was found that twinned austenite grains and the austenite grains present at the grain boundaries between larger ferrite grains typically transform first, i.e. are less stable, in contrast to austenite grains that are completely embedded in a larger ferrite grain. In the latter case, straining leads to rotations of the harder austenite grain within the softer ferrite matrix before the austenite transforms into martensite. The analysis suggests that austenite grain rotation behavior is also a significant contributing factor for enhancement of the ductility.

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Section: Grain Rotation-induced Plasticitymentioning

confidence: 94%

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

et al. 2012

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“…Thus formation of (110) Ti 3 Sn lamellae helps to minimize the interface energy in the eutectic structure and to maximize the growth rate along the lateral directions of the lamella plates. The excessive deformation of the TiNi matrix, including both the martensite reorientation and plastic deformation, facilitates the rigid body rotation [41] of the Ti 3 Sn eutectic lamellae to produce a physical texture of the Ti 3 Sn plates in the composite. Fig.…”

Section: Texture Formation Of Hard Ti 3 Sn By Rigid Rotationmentioning

confidence: 99%

In situ synchrotron high-energy X-ray diffraction study of microscopic deformation behavior of a hard-soft dual phase composite containing phase transforming matrix

et al. 2017

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a b s t r a c tThis study explored a novel intermetallic composite design concept based on the principle of lattice strain matching enabled by the collective atomic load transfer. It investigated the hard-soft microscopic deformation behavior of a Ti 3 Sn/TiNi eutectic hard-soft dual phase composite by means of in situ synchrotron high-energy X-ray diffraction (HE-XRD) during compression. The composite provides a unique micromechanical system with distinctive deformation behaviors and mechanisms from the two components, with the soft TiNi matrix deforming in full compliance via martensite variant reorientation and the hard Ti 3 Sn lamellae deforming predominantly by rigid body rotation, producing a crystallographic texture for the TiNi matrix and a preferred alignment for the Ti 3 Sn lamellae. HE-XRD reveals continued martensite variant reorientation during plastic deformation well beyond the stress plateau of TiNi. The hard and brittle Ti 3 Sn is also found to produce an exceptionally large elastic strain of 1.95% in the composite. This is attributed to the effect of lattice strain matching between the transformation lattice distortion of the TiNi matrix and the elastic strain of Ti 3 Sn lamellae. With such unique micromechanic characteristics, the composite exhibits high strength and large ductility.

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“…As the technique is nondestructive it enables studies of the same set of bulk grains before and after some external stimuli, e.g. elastic [5][6][7] and plastic deformation [8][9][10][11] or thermal annealing [12][13][14]. Several experimental set-ups are possible, each with specific advantages, e.g.…”

Section: Introductionmentioning

confidence: 99%

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

et al. 2015

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In Situ Measurement of Grain Rotation During Deformation of Polycrystals

Cited by 357 publications

References 7 publications

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

In situ synchrotron high-energy X-ray diffraction study of microscopic deformation behavior of a hard-soft dual phase composite containing phase transforming matrix

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

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