Principles of self-annealing in silver processed by equal-channel angular pressing: The significance of a very low stacking fault energy

Gubicza, Jenő; Chinh, Nguyen Q.; Lábár, János L.; Hegedűs, Zoltán; Langdon, Terence G.

doi:10.1016/j.msea.2009.08.071

Cited by 83 publications

(42 citation statements)

References 45 publications

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“…This and several other observations [10,11] prove that ECAE-processed copper is not stable at room temperature. A similar finding was recently obtained for ECAE-processed silver [12]. Heavily deformed pure metals of low to medium stacking fault energies are prone to room temperature recrystallization also when being subjected to other deformation modes [13,14].…”

Section: Resultssupporting

confidence: 78%

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: Resultssupporting

confidence: 78%

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

Mishin

Bowen

Godfrey

2012

MSF

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“…The Vickers hardness at the saturated level (HV) of a wide range of pure metals and semi-metals with various crystal structures processed through severe plastic deformation (SPD) have been reported [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]28,66]. In this work, we study the increment of hardness (∆HV) of 17 high purity (better than 99.9%) elements due to HPT reported in [4,5,9,10,23,28,66] (see Table 1).…”

Section: Hardness Data Of Hpt Processed Metalsmentioning

confidence: 98%

“…Following extensive work in the field by a range of researchers, extensive data on the hardness and microstructure of HPT processed metals and alloys is now available (e.g. [4,5,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]). Data on hardness increase due to HPT have been published for over 20 pure metals, and several of the factors influencing the hardness of HPT processed pure metals have been investigated in some detail by Edelati and Horita [4,5].…”

Section: Introductionmentioning

confidence: 99%

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

2013

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“…In addition, for the present CoCrFeMnNi HEA the low stacking fault energy (SFE, 19 mJ/m 2 [30]) also contributed to the very high dislocation density. The low SFE results in a dissociation of dislocations into partials which obstructs the annihilation mechanisms of dislocations as in cross slip and climb [31]. Therefore, both the high concentrations of the different alloying elements and the low SFE are the reasons for the very high dislocation density (~194 × 10 14 m -2 ) after 2 turns of HPT.…”

Section: Evolution Of Lattice Defect Structure In Cocrfemnni Hea Durimentioning

confidence: 99%

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

Heczel

Kawasaki

Lábár

et al. 2017

Journal of Alloys and Compounds

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105

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An equiatomic CoCrFeMnNi High-Entropy Alloy (HEA) produced by arc melting was processed by High-Pressure Torsion (HPT). The evolution of the microstructure during HPT was investigated after ¼, ½, 1 and 2 turns using electron backscatter diffraction and transmission electron microscopy. The spatial distribution of constituents was studied by energy-dispersive X-ray spectroscopy. The dislocation density and the twin-fault probability in the HPT-processed samples were determined by X-ray line profiles analysis. It was found that the grain size was gradually refined from ~60 µm to ~30 nm while the dislocation density and the twin-fault probability increased to very high values of about 194 × 10 14 m −2 and 2.7%, respectively, at the periphery of the disk processed for 2 turns. The hardness evolution was measured as a function of the distance from the center of the HPT-processed disks. After 2 turns of HPT, the microhardness increased from ~1440 MPa to ~5380 MPa at the disk periphery where the highest straining is achieved. The yield strength was estimated as onethird of the hardness and correlated to the microstructure.

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Principles of self-annealing in silver processed by equal-channel angular pressing: The significance of a very low stacking fault energy

Cited by 83 publications

References 45 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

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

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