An investigation of ductility and microstructural evolution in an Al−3% Mg alloy with submicron grain size

Wang, Jingtao; Horita, Zenji; Furukawa, Mutsuhisa; Nemoto, Minoru; Tsenev, Nikolai K.; Valiev, Ruslan Z.; Ma, Yan; Langdon, Terence G.

doi:10.1557/jmr.1993.2810

Cited by 199 publications

(60 citation statements)

References 13 publications

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“…These diffuse boundaries are typical of materials prepared using SPD techniques and they are consistent with the presence of a large volume of high-energy non-equilibrium boundaries [23]. The equiaxed grains visible in Fig.…”

Section: Resultssupporting

confidence: 73%

Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

Shahmir

Liu

et al. 2017

Materials Science and Engineering: A

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A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10 nm and then tested in tension at elevated temperatures from 773 to 1073 K using strain rates in the range from 1.0 × 10 -3 to 1.0 × 10 -1 s -1 . The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973 K. It is concluded that the formation of precipitates and the sluggish diffusion in the HEA inhibit grain growth and contribute to a reasonable stability of the fine-grained structure at elevated temperatures. The results show the activation energy for flow matches the anticipated value for grain boundary diffusion in nickel but the strain rate sensitivity is low due to the occurrence of some grain growth at these high testing temperatures.

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Section: Resultssupporting

confidence: 73%

Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

Shahmir

Liu

et al. 2017

Materials Science and Engineering: A

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102

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“…5(a) and 6(a) the grains tend to be irregular in shape, there are large numbers of intragranular dislocations and the grain boundaries are wavy and poorly defined. These microstructural characteristics are similar to those reported in an Al-3% Mg alloy after processing by ECAP [29,30] and they are a consequence of the presence of a high fraction of non-equilibrium grain boundaries [31]. By contrast, following an annealing treatment at 473 K for 1 h, the microstructures in Figs.…”

Section: Hardness and Microstructural Evolution During Mac Processingsupporting

confidence: 83%

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

Zhang

et al. 2013

Materials Science and Engineering: A

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a b s t r a c tAn Al-4% Cu alloy was selected as a model material in order to compare two different procedures for imposing severe plastic deformation: multi-axial compression (MAC) and high-pressure torsion (HPT). In MAC a compressive strain is applied to prismatic samples in a sequential order along three orthogonal directions and the process is repeated to large numbers of passes in order to attain high strains. In HPT a thin disk is held between anvils and subjected to a high applied pressure and concurrent torsional straining. The results show that HPT is the optimum procedure for producing a homogeneous ultrafinegrained material. Specifically, HPT is preferable because it produces materials having a larger degree of homogeneity and the equilibrium grain sizes are smaller and the Vickers microhardness values are higher than when processing by MAC.

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“…The occurrence of diffuse grain boundaries is well established in SPD processing and it is due to the introduction of non-equilibrium grain boundaries having an excess of extrinsic dislocations [24]. After additional revolutions to five turns, there remains many dislocations…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

Lee

Han

Janakiraman

et al. 2016

Journal of Alloys and Compounds

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Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion, Journal of Alloys and Compounds (2016), doi: 10.1016/ j.jallcom.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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An investigation of ductility and microstructural evolution in an Al−3% Mg alloy with submicron grain size

Cited by 199 publications

References 13 publications

Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

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

Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

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