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Local Accommodation Processes of Superplastic Grain Boundary Sliding: Their Direct Observation in Two-Dimensional Grain Boundary Sliding

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Abstract:

Accommodation processes are crucial for grain boundary sliding in superplasticity though few have been reported on their positive experimental evidences. The present study achieved two-dimensional grain boundary sliding in ODS ferritic steel which had elongated and aligned grain structure and got direct observations of accommodation processes without the surface effect of floating grains: 1) In Region II, diffusional accommodation was confirmed through observing the change in marking-line spacing, which indicates volume inflow and outflow at grain boundaries. 2) Between Regions II and III, dislocation accommodation inside of the mantle region, as proposed by Gifkins, was confirmed through observing curves of marking lines near grain boundaries. 3) In Region III, dislocation accommodation inside of the core region, as proposed by Ball and Hutchison, was confirmed through observing slip bands and sub-boundaries passing through a grain. It is, then, derived that superplasticity relies not on a single mechanism but on several diffusional and dislocation accommodations contributing depending on strain rate condition.

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Periodical:

Defect and Diffusion Forum (Volume 385)

Pages:

155-160

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.385.155

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Online since:

July 2018

Authors:

Eiichi Sato*, Hiroshi Masuda, Yoshito Sugino, Shigeharu Ukai

Keywords:

Accommodation, Ball-Hutchison, EBSP, FIB, Gifkins, Grain Boundary Sliding

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] A. Ball, M.M. Hutchison, Superplasticity in the aluminum-zinc eutectoid, Met. Sci. 3 (1969) 1-7.

Google Scholar

[2] A.K. Mukherjee, The rate controlling mechanism in superplasticity, Mat. Sci. Eng. 8 (1971) 83-89.

Google Scholar

[3] R.C. Gifkins, Grain-boundary sliding and its accommodation during creep and superplasticity, Metall. Trans. A 7 (1976) 1225-1232.

DOI: 10.1007/bf02656607

Google Scholar

[4] M.F. Ashby, R.A. Verrall, Diffusion-accommodated flow and superplasticity, Acta Metall. 21 (1973) 149-163.

DOI: 10.1016/0001-6160(73)90057-6

Google Scholar

[5] J.R. Spingarn, W.D. Nix, Diffusional creep and diffusionally accommodated grain rearrangement, Acta Metall. 26 (1978) 1389-1398.

DOI: 10.1016/0001-6160(78)90154-2

Google Scholar

[6] T.G. Langdon, A unified approach to grain boundary sliding in creep and su- perplasticity, Acta Metall. Mater. 42 (1994) 2437-2443.

DOI: 10.1016/0956-7151(94)90322-0

Google Scholar

[7] T.H. Alden, The origin of superplasticity in the Sne5%Bi alloy, Acta Metall. 15 (1967) 469-480.

DOI: 10.1016/0001-6160(67)90078-8

Google Scholar

[8] D. Lee, The nature of superplastic deformation in the Mg-Al eutectic, Acta Metall. 17 (1969) 1057-1069.

DOI: 10.1016/0001-6160(69)90051-0

Google Scholar

[9] K. Sotoudeh, P.S. Bate, Diffusion creep and superplasticity in aluminium alloys, Acta Mater 58 (2010) 1909-(1920).

DOI: 10.1016/j.actamat.2009.11.034

Google Scholar

[10] M.A. Rust, R.I. Todd, Surface studies of Region II superplasticity of AA5083 in shear: confirmation of diffusion creep, grain neighbor switching and absence of dislocation activity, Acta Mater 59 (2011) 5159-5170.

DOI: 10.1016/j.actamat.2011.04.051

Google Scholar

[11] M.J. Mayo, W.D. Nix, Direct observation of superplastic flow mechanism in torsion, Acta Metall. 37 (1989) 1121e1134.

DOI: 10.1016/0001-6160(89)90108-9

Google Scholar

[12] H. Muto, M. Sakai, The large-scale deformation of polycrystalline aggregates: cooperative grain-boundary sliding, Acta Mater 48 (2000) 4161-4167.

DOI: 10.1016/s1359-6454(00)00169-5

Google Scholar

[13] H. Masuda, S. Taniguchi, E. Sato, Y. Sugino, S. Ukai, Two-dimensional observation of grain boundary sliding of ODS ferritic steel in high temperature tension, Mater. Trans. 55 (2014) 1599-1605.

DOI: 10.2320/matertrans.m2014115

Google Scholar

[14] H. Masuda, H. Tobe, E. Sato, Y. Sugino, S. Ukai, Mantle region accommodating two-dimensional grain boundary sliding in ODS ferritic steel, Philos. Mag. Lett. 95 (2015) 359-366.

DOI: 10.1080/09500839.2015.1067732

Google Scholar

[15] H. Masuda, H. Tobe, E. Sato, Y. Sugino, S. Ukai, Two-dimensional grain boundary sliding and mantle dislocation accommodation in ODS ferritic steel, Acta Mater 120 (2016) 205-215.

DOI: 10.1016/j.actamat.2016.08.034

Google Scholar

[16] H. Masuda, H. Tobe, E. Sato, Y. Sugino, S. Ukai, Transgranular dislocation activities and substructural evolutions accommodating two-dimensional grain boundary sliding in ODS ferritic steel, Acta Mater 132 (2017) 245-254.

DOI: 10.1016/j.actamat.2017.04.047

Google Scholar

[17] H. Masuda, H. Tobe, E. Sato, Y. Sugino, S. Ukai, Direct detection of diffusional mass flux accommodating rigid grain boundary sliding, Nature, submitted.

DOI: 10.1016/j.actamat.2019.06.049

Google Scholar

[18] H. Okada, S. Ukai, M. Inoue, Effects of grain morphology and texture on high temperature deformation in oxide dispersion strengthened ferritic steels, J. Nucl. Sci. Technol. 33 (1996) 936-943.

DOI: 10.1080/18811248.1996.9732035

Google Scholar

[19] W.A. Rachinger, Relative grain translations in the plastic flow of aluminium. J. Inst. Metals, 81 (1952-1953) 33-41.

Google Scholar

[20] I.M. Lifshitz, On the theory of diffusion-viscous flow of polycrystalline bodies. Soviet Physics JETP, 17 (1963). 909-920.

Google Scholar

[21] R.L. Coble, A model for boundary diffusion controlled creep in polycrystalline materials. J. App. Phys. 34, (1963) 1679-1682.

DOI: 10.1063/1.1702656

Google Scholar

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