Thermal stability of ultrafine-grained aluminum in the presence of Mg and Zr additions

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

“…New data was obtained by performing ECAP on Al-1050, Al-Zr and Al-Zr-Si-Fe alloys and HPT on Al-2024 and Al-3Mg-0.2Mn, TEM and SEM micrographs for several alloys processed by ECAP and HPT are presented in Figs 6-8. Grain size data for a range of other commercial and experimental alloys was obtained from [30,35,36,73,74,75,76,77,78]. The database contains a total of 21 alloys, in a total of 37 alloy-processing combinations, with strains ranging from 1 to 17 and with resulting grain sizes between 2 μm and 50 nm, the full database is presented at [79].…”

The microstructural characteristics of ultrafine-grained nickel

“…In ECAP a bar or rod is pressed through a die constrained within a channel bent into an L-shaped configuration [1,[18][19][20] whereas in HPT a thin disk is subjected to a high pressure and concurrent torsional straining [4,5,21]. Although there have been extensive reports documenting the microstructural evolution taking place during SPD processing in ECAP [22,23] and HPT [5] and the subsequent stability of the UFG microstructures in annealing treatments [24][25][26], relatively little attention has been given either to the development of texture in SPD processing or to the nature of the grain boundary misorientation distributions. However, both of these parameters play a significant role in determining the bulk properties of the materials [27,28].…”

Distributions of Hardness and Strain during Compression in Pure Aluminum Processed with Equal-Channel Angular Pressing and Subsequent Annealing

“…Full details of the procedures for ECAP were given earlier. 16) Following ECAP, samples were annealed for 1 h at 573 K for comparison (hereafter, designated as the ECAPannealed sample). At this time, the Vickers hardness and the average grain size were measured and they were used in this study as the initial Vickers hardness, Hv 0 , and initial average grain size, d 0 : thus, for the ECAP sample, Hv 0 % 37 and d 0 % $2 mm and for the ECAP-annealed sample, Hv 0 % 25 and d 0 % $50 mm.…”

“…At this time, the Vickers hardness and the average grain size were measured and they were used in this study as the initial Vickers hardness, Hv 0 , and initial average grain size, d 0 : thus, for the ECAP sample, Hv 0 % 37 and d 0 % $2 mm and for the ECAP-annealed sample, Hv 0 % 25 and d 0 % $50 mm. An earlier report 16) gave details of the microstructural evolution occurring in ECAP samples during annealing. All ECAP samples including the annealed samples were machined to cylindrical specimens that were 12 mm in height and 8 mm in diameter for compression testing.…”

“…It was reported that a homogeneous equiaxed grain structure develops after processing through route Bc for 4 passes in pure Al and the microstructure and hardness remain essentially unchanged in the subsequent passes. [15][16][17] However, a question arises whether this may be the case if a strain path different than ECAP is successively applied to the ECAP-processed sample.…”