Through thickness texture gradients in rolled polycrystalline alloys

Schoenfeld, Scott E.; Asaro, R.J.

doi:10.1016/s0020-7403(96)80008-7

Cited by 29 publications

(23 citation statements)

References 14 publications

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“…The presence of strong through-thickness variations of texture in our sample is however in agreement with ARB simulation data of Li et al [14] and with predictions of texture heterogeneities resulting from large draught rolling [16].…”

Section: Texture Gradientssupporting

confidence: 92%

“…The higher HMS fractions observed both in the subsurface and near the center of the ARBprocessed sample correlate well with expected increase in the amount of shear deformation in the subsurface layers due to large-draught rolling [16,22,23]. Note that the center layer in our ARB sample was the surface layer in the fifth ARB cycle, and thus also experienced a significant shear strain before being subjected to conditions approaching plane strain compression (PSC) in the sixth cycle.…”

Section: Variation Of Microstructural Parameterssupporting

confidence: 80%

“…Despite the large-draught rolling utilized during ARB (which is expected to produce pronounced shear texture components near the surface [16]), rolling-type textures were reported even for the immediate surface of this ARB-processed Ni sample, and very little difference was seen in the fractions of the rolling texture components between the surface and other locations [15]. The heterogeneity of the microstructure in ARB-processed Ni was also evaluated by considering such average parameters as the fraction of HABs and the HAB spacing [17], with the latter parameter analyzed at only two depths, which is hardly sufficient to support conclusions regarding the through-thickness homogeneity.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of through-thickness heterogeneities of microstructure and texture in nickel after accumulative roll bonding

2013

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Section: Texture Gradientssupporting

confidence: 92%

Section: Variation Of Microstructural Parameterssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Analysis of through-thickness heterogeneities of microstructure and texture in nickel after accumulative roll bonding

2013

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“…5). Similar to the previous experimental results (Hansen & Mecking, 1975) and simulation data (Schoenfeld & Asaro, 1996), the shear texture components were found in the quarter thickness. It appears, however, that the maximum intensity of the {001}h110i shear texture component is slightly shifted from S = 0.5 toward S = 0.72 (Fig.…”

Section: Figuresupporting

confidence: 89%

Application of high-energy synchrotron radiation for texture studies

et al. 2000

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A novel experimental technique that employs high-energy synchrotron radiation is used for the investigation of through-thickness texture gradients in two aluminium plates, cold-rolled 40% with either intermediate or small draughts. In these two plates, crystallographic textures are inspected in a large number of layers. Texture maps of pole densities throughout the sample thickness are presented. A texture of the rolling type is developed through the plate thickness after intermediate draught rolling. Pronounced inhomogeneities associated with the shear texture are observed in the sample rolled with small draughts. For selected layers, direct pole ®gures are compared with those obtained by traditional low-energy X-ray diffraction and by the electron backscattering pattern technique using a scanning electron microscope. A good qualitative agreement between textures measured using the three different techniques is obtained. Experimental aspects and potentials of the new technique are discussed.

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“…The fact that ARB produces a more refined microstructure and a higher frequency of closely spaced HABs than conventional rolling is attributed to a greater number of subsurface layers in the body of the ARB sample. These layers experience additional shear deformation, enhanced by the large-draught rolling conditions [25] used during the ARB process. A larger effective strain makes the microstructure more refined and increases the fraction of HABs in the ARB stack [26], which results in its higher hardness compared to the CR sample (see Table 2).…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB). Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels. Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ0 = k2dav-0.5, where k2 is a constant and dav is the average boundary spacing in the deformed microstructure. Abstract: A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB).Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels.Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on *Manuscript Click here to view linked References 2 the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ 0 = k 2 d av -0.5 , where k 2 is a constant and d av is the average boundary spacing in the deformed microstructure.

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Through thickness texture gradients in rolled polycrystalline alloys

Cited by 29 publications

References 14 publications

Analysis of through-thickness heterogeneities of microstructure and texture in nickel after accumulative roll bonding

Analysis of through-thickness heterogeneities of microstructure and texture in nickel after accumulative roll bonding

Application of high-energy synchrotron radiation for texture studies

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

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