Optimizing the procedure of equal-channel angular pressing for maximum superplasticity

Komura, Shogo; Furukawa, Mutsuhisa; Horita, Zenji; Nemoto, Minoru; Langdon, Terence G.

doi:10.1016/s0921-5093(00)01255-7

Cited by 149 publications

(77 citation statements)

References 27 publications

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“…9, a stress exponent of n ≈ 3.0 is calculated for all datum It is important to note that the testing conditions used in this investigation are significantly lower than the normal power-law breakdown which occurs at high stresses at a normalized strain rate of It is worth noting that, although the Al-3% Mg alloy in the present study failed to demonstrate true superplasticity at 673 K due to grain growth, Al-Mg alloys have a significant potential for achieving excellent superplastic ductilities especially when additions such as Sc and/or Zr are introduced to maintain an ultrafine-grained microstructure. For example, Al-3% Mg alloys with additions of Sc [55][56][57][58][59][60][61][62][63][64][65] and both Sc and Zr [64,66,67] demonstrated excellent superplastic elongations of up to >2000% at temperatures in the range of 573-723 K using strain rates of ~10 -4 -1.0 s -1 after processing though ECAP for 6-8 passes.…”

Section: High Temperature Mechanical Propertiesmentioning

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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Section: High Temperature Mechanical Propertiesmentioning

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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“…1a. Effect of grain size on superplastic strain rate in Al alloys; [7] datum points for ECAP [11][12][13][14][15][16][17][18][19][20] are in black and for HPT [21][22][23][24][25][26][27][28][29] in red; the encircling ovals are in blue for ECAP and pink for HPT and the solid line corresponds to eq. (2) in the text.…”

Section: Figure Captionsmentioning

confidence: 99%

“…[7,10] The experimental results shown in Fig. 1[a] are taken from various reports for Al alloys, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and in Fig. 1 [b] there are similar sets of data for a range of Mg alloys [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] where the upper solid lines in Figs 1[a] and [b] show the predicted normalized strain rates derived using eq.…”

Section: Introductionmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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“…Although the superplastic properties of Al-Mg-Sc alloys were studied extensively after ECAP [24,25,28,[32][33][34][35][36][37] and HPT [38][39][40][41], there are only limited studies documenting the mechanical properties of UFG Al-Mg-Sc alloys at ambient temperatures [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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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 galley proof before it is published in its final citable 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. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

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Optimizing the procedure of equal-channel angular pressing for maximum superplasticity

Cited by 149 publications

References 27 publications

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

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

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

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