Evolution of ultrafine microstructures in commercial purity aluminum heavily deformed by torsion

Khamsuk, Sunisa; Park, Nokeun; Adachi, Hiroki; Terada, Daisuke; Tsuji, Nobuhiro

doi:10.1007/s10853-012-6661-2

Cited by 18 publications

(12 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Non-uniform distribution of microstructure and micro-hardness on transverse section was related to gradient strain introduced by torsion deformation. The similar phenomena were observed through analyzing the twisted pure aluminum rods [9]. The compressive strength increased gradually while tensile strength exhibited a non-monotonous change with the increase of torsion angle for hexagonal close-packed (HCP) AZ31 manganese alloy [10].…”

Section: Introductionsupporting

confidence: 73%

“…Researches had shown that the hardening of deformed materials was attributed to dislocation proliferation during torsion deformation for pure copper and pure aluminum [6,9]. Guo pointed out that dislocation proliferation lead to hardening, but the generation of lamellae twin and the weakening of extrusion texture would result in appearance of softening during torsion deformation [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hardening and softening analysis of pure titanium based on the dislocation density during torsion deformation

Han

et al. 2016

Materials Science and Engineering: A

View full text Add to dashboard Cite

Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Hardening and softening analysis of pure titanium based on the dislocation density during torsion deformation

Han

et al. 2016

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…It is an equilibrium stress state under large strain caused by torsion deformation. In a word, the processes of grain refinement of coarse pure Al consists of formation of the SBs, SGBs, high-angle misorientation grain boundaries and equiaxed structures based on TEM observation and the previous researches [12][13]. Figure 4 The TEM images of (a) 3 turns deformed pure Al, (b) 6 turns deformed pure Al, (c) and (d) 9 turns deformed pure Al.…”

Section: Dislocation Evolutionmentioning

confidence: 89%

Microstructure and Texture Evolution of Pure Al Subjected to Torsion Deformation

Liu¹,

Chen²

2017

Proceedings of the 2017 5th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 20

View full text Add to dashboard Cite

Systematic experimental studies on microstructure evolution and texture development of pure Al during torsion at room temperature are carried out by electron back scattering diffraction (EBSD) and transmission electron microscopy (TEM). The microstructure evolution states the grains of deformed pure Al are refined evidently. The refinement mechanisms of pure Al are attributed to dislocation slip and recrystallization. The texture evolution of pure Al indicates that the position of {001} fiber changes slightly, but its intensity first increases and then decreases with the increase of deformation during torsion. Finally, the processes of grain refinement of pure Al during torsion are discussed based on TEM observations.

show abstract

“…Such facilities can be of two types: (i) conventional upper-lower anvil type presses [5] or (ii) the split Hopkinson pressure bar system and their adaptations [6]. In addition few studies report the use of torsional deformation devices which can be either torsional Kolsky bar systems [7] or conventional torsion deformation devices [8]. However, all of the above methods of dynamic deformation suffer from their inability to apply hydrostatic pressure on the material during SPD, which seriously limits the amount of strain that can be imparted, without the failure of material.…”

Section: Introductionmentioning

confidence: 99%

Dynamic High Pressure Torsion (DHPT)—A Novel Method for High Strain Rate Severe Plastic Deformation

Lanjewar

Kestens

Verleysen

2018

The 18th International Conference on Experimental Mechanics

View full text Add to dashboard Cite

Metals with a fine-grained microstructure have exceptional mechanical properties. Severe plastic deformation (SPD) is one of the most successful ways to fabricate ultrafine-grained (UFG) and nanostructured (NC) materials. Most of the SPD techniques employ very low processing speeds. However, the lowest steady-state grain size which can be obtained by SPD is considered to be inversely proportional with the strain rate at which the severe deformation is imposed. In order to overcome this limitation, methods operating at higher rates have been envisaged and used to study the fragmentation process and the properties of the obtained materials. However, almost none of these methods, employ hydrostatic pressures which are needed to prevent the material from failing at high deformation strains. As such, their applicability is limited to materials with a high intrinsic ductility. Additionally, in some methods the microstructural changes are limited to the surface layers of the material. To circumvent these restrictions, a novel facility has been designed and developed which deforms the material at high strain rate under high hydrostatic pressures. Using the facility, commercially pure aluminum was processed and analysis of the deformed material was performed. The microstructure evolution in this material was compared with that observed in static high pressure torsion (HPT) processed material.

show abstract

Evolution of ultrafine microstructures in commercial purity aluminum heavily deformed by torsion

Cited by 18 publications

References 23 publications

Hardening and softening analysis of pure titanium based on the dislocation density during torsion deformation

Hardening and softening analysis of pure titanium based on the dislocation density during torsion deformation

Microstructure and Texture Evolution of Pure Al Subjected to Torsion Deformation

Dynamic High Pressure Torsion (DHPT)—A Novel Method for High Strain Rate Severe Plastic Deformation

Contact Info

Product

Resources

About