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Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO3.

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Title: Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO3.
Authors: Porz, Lukas1 (AUTHOR) porz@ceramics.tu-darmstadt.de, Scherer, Michael1 (AUTHOR), Höfling, Marion2 (AUTHOR), Nakamura, Atsutomo3,4 (AUTHOR), Rheinheimer, Wolfgang5 (AUTHOR), Rödel, Jürgen1 (AUTHOR)
Source: Journal of Materials Science. Feb2023, Vol. 58 Issue 6, p2430-2438. 9p. 1 Black and White Photograph, 3 Graphs.
Subjects: Dislocation density, Perovskite, Single crystals, Strain rate, Transmission electron microscopy
Abstract: Dislocation networks have been demonstrated to substantially enhance functional properties. As-sintered samples are virtually devoid of dislocations, new innovative techniques for introducing sufficiently high dislocation densities into polycrystalline ceramics are needed. While dislocation-based plasticity at high temperatures has been demonstrated for a large range of ceramic single crystals, plasticity in polycrystals is much less understood. Here, we demonstrate plastic strains in excess of several % based on dislocation motion in polycrystalline SrTiO3 at ≈ 1100 °C with 3.9 µm grain size. Ultra-high voltage electron microscopy reveals an associated increase in dislocation density by three orders of magnitude. Achievable strain rates are comparable to creep-based mechanisms and much less sensitive to applied stress than observed for metals. A specialized testing protocol allows quantification of the deformability via stress exponent, activation volume and activation enthalpy giving additional quantification. In conjunction with TEM images, the mechanical data gives insight into the underlying mechanisms. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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PubType: Academic Journal
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  Data: Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO<subscript>3</subscript>.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Feb2023, Vol. 58 Issue 6, p2430-2438. 9p. 1 Black and White Photograph, 3 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Single+crystals%22">Single crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Strain+rate%22">Strain rate</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink>
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  Data: Dislocation networks have been demonstrated to substantially enhance functional properties. As-sintered samples are virtually devoid of dislocations, new innovative techniques for introducing sufficiently high dislocation densities into polycrystalline ceramics are needed. While dislocation-based plasticity at high temperatures has been demonstrated for a large range of ceramic single crystals, plasticity in polycrystals is much less understood. Here, we demonstrate plastic strains in excess of several % based on dislocation motion in polycrystalline SrTiO3 at ≈ 1100 °C with 3.9 µm grain size. Ultra-high voltage electron microscopy reveals an associated increase in dislocation density by three orders of magnitude. Achievable strain rates are comparable to creep-based mechanisms and much less sensitive to applied stress than observed for metals. A specialized testing protocol allows quantification of the deformability via stress exponent, activation volume and activation enthalpy giving additional quantification. In conjunction with TEM images, the mechanical data gives insight into the underlying mechanisms. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10853-022-07405-3
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 2430
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      – SubjectFull: Dislocation density
        Type: general
      – SubjectFull: Perovskite
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      – SubjectFull: Single crystals
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      – SubjectFull: Strain rate
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      – SubjectFull: Transmission electron microscopy
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            NameFull: Scherer, Michael
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            NameFull: Nakamura, Atsutomo
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            NameFull: Rheinheimer, Wolfgang
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              M: 02
              Text: Feb2023
              Type: published
              Y: 2023
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