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A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys
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- Barba, D. (author)
- Univ Oxford, England
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- Alabort, E. (author)
- Univ Oxford, England
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- Garcia-Gonzalez, D. (author)
- Univ Oxford, England
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- PERGAMON-ELSEVIER SCIENCE LTD, 2018
- 2018
- English.
- In: International journal of plasticity. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0749-6419 .- 1879-2154. ; 105, s. 74-98
- Journal article (peer-reviewed)
Abstract
Subject headings
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- An elasto-viscoplastic thermodynamically consistent constitutive model for diffusion-assisted phase transformations is presented here. The model accounts for the different deformation mechanisms, their time dependence, the crystal rotations produced by microtwin propagation and the chemistry-plasticity coupling occurring at high temperature. It is applied to the study of the chemically assisted microtwinning observed in Ni-based superalloys in the temperature range of 600-800 degrees C. The model parameters are calibrated against multi-directional mechanical data from tensile creep tests of single crystal superalloy MD2. The constitutive model is then implemented into a crystal plasticity finite element code to study the activation of the different deformation mechanisms within single crystal and polycrystalline aggregates. Doing so, a relation between the rotations of the crystal and the creep life of the different crystal orientations is established. The results eventually reveal the critical role of the strong anisotropy of microtwin formation on the asymmetric behavior of the alloy and its relevant role on the mechanical performance.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Keyword
- Creep; Crystal plasticity; Ni-based superalloys; Phase-transformation
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Moverare, Johan
- Reed, R. C.
- Jerusalem, A.
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- ENGINEERING AND TECHNOLOGY
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