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Microstructural evo...
Microstructural evolution and superplastic behavior of a fine-grained Mg-Gd alloy processed by constrained groove pressing
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- Hoseini-Athar, M. M. (author)
- Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran.
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- Mahmudi, R. (author)
- Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran.
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- Babu, Prasath (author)
- KTH,Materialvetenskap
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- Hedström, Peter (author)
- KTH,Materialvetenskap
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Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran Materialvetenskap (creator_code:org_t)
- ELSEVIER SCIENCE SA, 2019
- 2019
- English.
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In: Materials Science & Engineering. - : ELSEVIER SCIENCE SA. - 0921-5093 .- 1873-4936. ; 754, s. 390-399
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- In the current study, microstructural evolution and superplasticity of an extruded Mg-2wt% Gd sheet were studied after the constrained groove pressing (CGP) process. Microstructural observations by scanning electron microscopy and electron backscattered diffraction revealed that after 4 cycles of CGP, a rather homogeneous fine-grained microstructure with an average grain size of 4.3 mu m, and a large fraction of high angle grain boundaries was obtained. By performing shear punch tests (SPT) at different temperatures and various shear strain rates, a peak strain rate sensitivity index (m-value) of 0.49 was obtained after 4 cycles of CGP process at 673 K, while peak m-values of 0.31 and 0.36 were obtained for the as-extruded and 2 cycle CGP process conditions, respectively. An m-value of 0.49 and an activation energy of 113 kJ/mol, obtained for the fine-grained material after 4 cycles of CGP, suggest that the dominant deformation mechanism in the superplastic regime is grain boundary sliding (GBS) controlled by grain boundary diffusion.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Constrained groove pressing
- Mg-Gd alloy
- Shear punch test
- Superplasticity
Publication and Content Type
- ref (subject category)
- art (subject category)
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