Using an Al–Cu binary alloy to compare processing by multi-axial compression and high-pressure torsion

Xu, Xiaochang; Zhang, Qi; Hu, Nan; Huang, Yi; Langdon, Terence G.

doi:10.1016/j.msea.2013.09.001

Cited by 30 publications

(16 citation statements)

References 47 publications

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“…The development of a high initial hardness at very low strains and the subsequent decrease in hardness to a lower plateau value is designated softening with rapid recovery [17] and later it was fully documented in experiments on high purity Al where the HPT processing was performed through fractional numbers of revolutions between 1/8 and 1 turn [19,20] or hardness values were recorded on different sectional planes throughout the disks [21]. The occurrence of softening with rapid recovery appears to be almost unique to high purity aluminum because aluminum of lower purity (99.7%) [22] and numerous Al-based alloys [23][24][25][26][27][28][29][30][31][32][33] exhibit conventional hardening without recovery. Nevertheless, there are two recent reports of softening with rapid recovery in the h.c.p.…”

Section: Introductionmentioning

confidence: 95%

Microstructure and microhardness of OFHC copper processed by high-pressure torsion

Almazrouee

Al‐Fadhalah

Alhajeri

et al. 2015

Materials Science and Engineering: A

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An ultra-high purity oxygen free high conductivity (OFHC) Cu was investigated to determine the evolution of microstructure and microhardness during processing by highpressure torsion (HPT). Disks were processed at ambient temperature, the microstructures were observed at the center, mid-radius and near-edge positions and the Vickers microhardness was recorded along radial directions. At low strains, Σ3 twin boundaries are formed due to dynamic recrystallization before microstructural refinement and ultimately a stabilized ultrafine grain structure is formed in the near-edge position with an average grain size of ~280 nm after 10 turns. Measurements show the microhardness initially increases to ~150 Hv at an equivalent strain of ~2, then falls to about ~80 Hv during dynamic recrystallization up to a strain of ~8 and thereafter increases again to a saturated value of ~150 Hv at strains above ~22. The delay in microstructure and microhardness homogeneity by dynamic recrystallization is attributed to the high purity of Cu that enhances dislocation mobility and causes dynamic softening during the early stages of straining.

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Section: Introductionmentioning

confidence: 95%

Microstructure and microhardness of OFHC copper processed by high-pressure torsion

Almazrouee

Al‐Fadhalah

Alhajeri

et al. 2015

Materials Science and Engineering: A

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“…For example, a Ti–6Al–4V alloy with submicrocrystalline structure produced by multiple forging showed an increase in the fatigue endurance limit by 17% in rotating bending conditions . Nevertheless, it is important to note that multiple forging produces materials generally having a low level of homogeneity compared to other SPD techniques …”

Section: Introductionmentioning

confidence: 99%

Fatigue Life and Failure Characteristics of an Ultrafine‐Grained Ti–6Al–4V Alloy Processed by ECAP and Extrusion

et al. 2014

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Experiments were conducted to investigate the low-cycle deformation behavior of an ultrafinegrained (UFG) Ti-6Al-4V alloy produced by severe plastic deformation (SPD) through a combination of equal-channel angular pressing (ECAP) and extrusion. The fatigue properties were examined by stress-controlled fatigue testing at stress amplitudes in the range of 700-1050 MPa. The specimens exhibited a dimpled final overload fracture mode. The results show the UFG alloy has a longer fatigue life and a finer dimple size than the coarse-grained material.

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“…The main multi-directional forging (MDF) problem is a strain inhomogeneity. As a result, an inhomogeneous grain structure forms in bulk material [21][22][23][24]. The grain structure consists of very fine grains and coarse grains in pure Al subjected to multi-directional forging at room temperature [25,26].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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Using an Al–Cu binary alloy to compare processing by multi-axial compression and high-pressure torsion

Cited by 30 publications

References 47 publications

Microstructure and microhardness of OFHC copper processed by high-pressure torsion

Microstructure and microhardness of OFHC copper processed by high-pressure torsion

Fatigue Life and Failure Characteristics of an Ultrafine‐Grained Ti–6Al–4V Alloy Processed by ECAP and Extrusion

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

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