Through-Thickness Variations of Deformed and Annealed Microstructures in ECAE-Processed Copper

Mishin, Oleg; Bowen, Jacob R.

doi:10.1007/s11661-009-9852-y

Cited by 25 publications

(30 citation statements)

References 24 publications

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“…This material was investigated in the as-deformed condition [5] and after eight years of room-temperature storage [6]. An additional route-A sample (copper of 99.98% purity) was prepared by extruding a 15-mm-diameter billet of length 100 mm to a strain of 10 in a 120° die [4]. A part of this sample was stored at -20°C between sample preparation and characterization operations.…”

Section: Methodsmentioning

confidence: 99%

“…The microstructure of the samples was investigated in the longitudinal side section that contained the extrusion direction (ED) and the normal direction (ND), see [4,5]. The EBSD technique coupled to a Zeiss Supra 35 FEGSEM was used for orientation mapping.…”

Section: Methodsmentioning

confidence: 99%

“…Due to the presence of orientation noise in the data only misorientations above 2° were considered in a quantitative analysis of boundary populations. The heterogeneity was analyzed using a method that is based on a partitioning of the microstructure into regions containing either predominantly high angle misorientations, referred to as high misorientation regions (HMRs), or predominantly low angle misorientations, referred to as low misorientation regions (LMRs) [4,[6][7][8]. To obtain a LMR/HMR partitioning, a "grain reconstruction" of each ESBD data set was carried out at 5°.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, each LMR subset consists of regions > 2.5 µm 2 where the microstructure contains boundaries with misorientation of < 5°. A modified approach was used for quantitative analysis of recrystallized grains (for details see [4,6]). …”

Section: Methodsmentioning

confidence: 99%

“…The heterogeneities exist both locally and on the sample scale, e.g. from the end to the middle [3] or the top to the bottom of the billet [4]. The presence of deformation-induced heterogeneities is known to affect the progress of recrystallization and therefore should be characterized thoroughly.…”

Section: Introductionmentioning

confidence: 99%

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EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Mishin

Bowen

Godfrey

2012

MSF

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Abstract. The deformed microstructure and recrystallization behavior of copper samples processed using equal channel angular extrusion (ECAE) have been investigated. The heavily deformed microstructure was found to be non-uniform through the sample thickness and to vary in a manner consistent with the non-uniform distribution of strain imposed by processing. The through-thickness heterogeneity of the deformed microstructure resulted in a different extent of recrystallization in different layers during annealing. Recrystallized grains were also observed in samples that were not annealed, but stored at room temperature, which indicates that the deformed microstructure of ECAE-processed pure copper is unstable even at room temperature. In each sample, recrystallization was found to initiate in regions containing predominantly large misorientations.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Mishin

Bowen

Godfrey

2012

MSF

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

2013

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The influence of multiscale heterogeneity on recrystallization in nickel processed by accumulative roll bonding

2016

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Microscopic and sample-scale heterogeneities have been characterized in nickel processed by accumulative roll bonding to a von Mises strain of 4.8, and their influence on recrystallization has been analyzed. The microscopic heterogeneities in this material are mostly associated with regions near the bonding interface, which are more refined and thus possess a higher stored energy than other regions. These regions also contain characteristic particle deformation zones around fragments of the steel wire brush used to prepare the surface for bonding. The sample-scale heterogeneities are seen as variations in the distribution of different texture components and in the fractions of high misorientation regions between the subsurface, intermediate and center layers. Each of these heterogeneities affects the progress of recrystallization. Regions near bonding interfaces, particle deformation zones and shear bands are all found to act as preferential nucleation sites. On the sample scale, recrystallization proceeds faster in the intermediate layer than in the center and subsurface layers. Comparing the progress of recrystallization in ARB-processed nickel and conventionally rolled nickel, it is evident that * Corresponding author: e-mail: olmi@dtu.dk 1 additional deformation heterogeneities induced by ARB result in nucleation taking place over a more extended period of time.

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Through-Thickness Variations of Deformed and Annealed Microstructures in ECAE-Processed Copper

Cited by 25 publications

References 24 publications

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

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

The influence of multiscale heterogeneity on recrystallization in nickel processed by accumulative roll bonding

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