The application of EBSD to the study of substructural development in a cold rolled single-phase aluminium alloy

Hurley, Peter; Humphreys, F.J.

doi:10.1016/s1359-6454(02)00513-x

Cited by 285 publications

(171 citation statements)

References 16 publications

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“…These can be similar to transition bands of microshear or kink bands. [18][19][20] The density and misorientation angle of such boundaries increase with further repeated MDF to " ¼ 2:1 (Figs. 5(b) and (c)).…”

Section: Microstructural Developmentmentioning

confidence: 95%

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

et al. 2004

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Effect of pass strain (Á") on grain refinement was studied in multidirectional forging (MDF) of a coarse-grained 7475 Al alloy at 490 C under a strain rate of 3 Â 10 À4 s À1 . Samples of rectangular shape were deformed up to accumulated strains of around 6 with subsequent changes in loading direction 90 from pass to pass. The pass strains in each compression (Á") were 0.4 and 0.7. The cumulative flow curves integrated by each compression exhibit significant work softening just after yielding, followed by apparent steady state plastic flow at high strains. Structural changes were characterized by grain fragmentation due to frequent development of deformation and/or microshear bands followed by full evolution of new fine grains in the original grains. Increasing Á" accelerates significantly the kinetics of grain refinement, leading to more clear reduction of flow stresses at moderate to high strains. MDF of Á" ¼ 0:7 results finally in formation of a finer grained structure with an average size of around 7.5 mm at strains of above 3.5, while, the processing with Á" ¼ 0:4 develops a slightly coarser grain structure at higher strain of about 6. The effect of MDF on new grain evolution and the mechanisms of grain refinement are discussed in details.

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Section: Microstructural Developmentmentioning

confidence: 95%

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

et al. 2004

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“…3e and Table 1). The development of such microstructures is well documented in cold rolled fcс cubic metals [1,[32][33][34] and is conventionally attributed to the activation of the grain subdivision process. The EBSDdetected LAB fraction was 82% (Table 1).…”

Section: Base Materialsmentioning

confidence: 99%

“…This scatter can be partly attributed to the co-existence of two different types of LABs (i.e., incidental dislocation boundaries and boundaries that are geometrically necessary) that accumulate misorientation with different speeds. Nevertheless, a magnitude of 2-31 is often reported as a reasonable mean misorientation, e.g., [34,41]. In this work, a mean LAB misorientation of 31 was used.…”

Section: Grain-boundary Strengtheningmentioning

confidence: 99%

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Malopheyev

Kulitskiy

Mironov

et al. 2014

Materials Science and Engineering: A

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tThe effect of prior work hardening on the microstructure and mechanical properties of a friction-stir welded (FSWed) Al-5.4Mg-0.2Sc-0.1Zr alloy was investigated. The microstructure of the final stir zone was shown to be weakly dependent on the initial condition of the base material; FSW led to the formation of fully recrystallized microstructures with average grain sizes ranging from 1.2 to 1.5 μm and a moderate dislocation density of $ 3.57 1.5 Â 10 13 m À 2 in the stir zone. The nano-scale Al 3 (Sc,Zr) dispersoids coarsened from 9 to $ 15 nm but retained a coherent relationship with the matrix. In contrast, the joint efficiency of the obtained welds was very sensitive to the initial material condition. Nearly full strength joints were obtained in both annealed (O) and partially hardened and stabilized (H323) conditions. However, the joint efficiency was only 65% in the fully hardened condition (H18). The relatively low weld strength for the alloy in the H18 condition was attributed to the elimination of dislocation and substructure strengthening during FSW.

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“…This is supported by the recent work using EBSD [25]. In contrast, the Manchester group [26][27][28], using EBSD microtexture analysis, asserts that the deformed microstructures are independent of crystallography and the MBs are aligned with the planes of maximum shear stress. [29][30]; plane strain compressed Ni (FCC) single crystals of the Goss orientation [31][32][33], and cold rolled commercial purity aluminium (FCC) [34].…”

Section: Crystallographic Nature Of Microbands In Cold Deformed Metalmentioning

confidence: 90%

Uncovering the true nature of deformation microstructures using 3D analysis methods

Ferry

Quadir

Afrin

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Three-dimensional electron backscatter diffraction (3D EBSD) has emerged as a powerful technique for generating 3D crystallographic information in reasonably large volumes of a microstructure. The technique uses a focused ion beam (FIB) as a high precision serial sectioning device for generating consecutive ion milled surfaces of a material, with each milled surface subsequently mapped by EBSD. The successive EBSD maps are combined using a suitable post-processing method to generate a crystallographic volume of the microstructure. The first part of this paper shows the usefulness of 3D EBSD for understanding the origin of various structural features associated with the plastic deformation of metals. The second part describes a new method for automatically identifying the various types of low and high angle boundaries found in deformed and annealed metals, particularly those associated with grains exhibiting subtle and gradual variations in orientation. We have adapted a 2D image segmentation technique, fast multiscale clustering, to 3D EBSD data using a novel variance function to accommodate quaternion data. This adaptation is capable of segmenting based on subtle and gradual variation as well as on sharp boundaries within the data. We demonstrate the excellent capabilities of this technique with application to 3D EBSD data sets generated from a range of cold rolled and annealed metals described in the paper.

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The application of EBSD to the study of substructural development in a cold rolled single-phase aluminium alloy

Cited by 285 publications

References 16 publications

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Uncovering the true nature of deformation microstructures using 3D analysis methods

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