Current-induced ductility enhancement of a Magnesium alloy AZ31 in uniaxial micro-tension below 373 K
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hdl:2117/130205
Tipus de documentArticle
Data publicació2018-12-31
EditorMultidisciplinary Digital Publishing Institute (MDPI)
Condicions d'accésAccés obert
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Abstract
The size effects in metal forming have been found to be crucial in micro-scale plastic deformation or micro-forming processes, which lead to attenuation of the material’s formability due to the increasing heterogeneity of the plastic flow. The use of an electric field during micro-scale plastic deformation has shown to relieve size effects, enhance the material’s formability, modify the microstructure, etc. Consequently, these electric-assisted (EA) micro-forming processes seem to bring many potential benefits that need to be investigated. Accordingly, here we investigated the influence of an electric field on the size effects to describe the fracture behavior in uniaxial micro-tension tests of an AZ31 alloy with various grain sizes. In order to decouple the thermal-mechanical and microstructure changes, room temperature (RT), oven-heated (OH), air-cooled (AC), and EA uniaxial
micro-tension tests were conducted. The size effects contribution on the fracture stress and strain showed a similar trend in all the testing configurations. However, the smallest fracture stresses and the largest fracture strains were denoted in the EA configuration. EBSD examination shows that current-induced dynamic recrystallization (DRX) and texture evolution could be negligible under the studied conditions. The kernel average misorientation (KAM) maps give the larger
plastic deformation in the EA specimens due to the reduction of plastic micro-heterogeneity. Finally, the fracture morphology indicates that the current-induced ductility enhancement may be attributed
to the arrest of micro-crack propagation and the inhibition of void initiation, growth, and coalescence caused by lattice melting and expansion.
CitacióSanchez Egea, A. J. Current-induced ductility enhancement of a Magnesium alloy AZ31 in uniaxial micro-tension below 373 K. "Materials", 31 Desembre 2018, vol. 12, núm. 111, p. 1-12.
ISSN1996-1944
Versió de l'editorhttps://www.mdpi.com/1996-1944/12/1/111
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Current-Induced Ductility Enhancement-2019.pdf | Manuscript | 5,401Mb | Visualitza/Obre |