Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites
The flow stress reduction during plastic deformation superposed with electric current, commonly referred as ‘electroplasticity’ has been actively researched over the past few decades. While the existence of an electron–dislocation interaction, independent of Joule heating is established, the exact r...
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doaj-25a5c9592da7466ea0be9897411fe0db2021-05-24T04:31:03ZengElsevierJournal of Materials Research and Technology2238-78542021-05-011221852204Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocompositesJai Tiwari0Padma Pratheesh1O.B. Bembalge2Hariharan Krishnaswamy3Murugaiyan Amirthalingam4S.K. Panigrahi5Manufacturing Engineering Section, Department of Mechanical Engineering, IIT, Madras, Chennai, 600036, IndiaManufacturing Engineering Section, Department of Mechanical Engineering, IIT, Madras, Chennai, 600036, IndiaManufacturing Engineering Section, Department of Mechanical Engineering, IIT, Madras, Chennai, 600036, IndiaManufacturing Engineering Section, Department of Mechanical Engineering, IIT, Madras, Chennai, 600036, India; Corresponding author.Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, IndiaManufacturing Engineering Section, Department of Mechanical Engineering, IIT, Madras, Chennai, 600036, IndiaThe flow stress reduction during plastic deformation superposed with electric current, commonly referred as ‘electroplasticity’ has been actively researched over the past few decades. While the existence of an electron–dislocation interaction, independent of Joule heating is established, the exact rate controlling mechanism of the observed behaviour lacks consensus. Understanding the governing mechanism is complex due to the combined effect of Joule heating and electron–dislocation interaction. The present work attempts to establish the electroplastic mechanism in AA 6063 alloy and its nanocomposites. The role of microstructure on the electron interaction is investigated by preparing four distinct microstructure from the base alloy. All the samples were subjected to constant amplitude direct current during plastic deformation. The Joule heating effect is decoupled using the experimentally measured temperature history. The potential electroplastic mechanism for the alloy is elucidated by analysing the trend of flow stress reduction with strain and strain rate. It is inferred that micro Joule heating and electron wind effect cannot completely explain the observed electroplastic behaviour in AA 6063. The SiC particles in nano-composites suppressed the electroplastic effect.The observed mechanical behaviour under electric current is in agreement with the trend predicted assuming magnetic depinning mechanism. The reduction of dislocation density quantified using X-ray diffraction is found to concur with the inferred mechanism.http://www.sciencedirect.com/science/article/pii/S2238785421003392AA 6063Electric-assisted deformationJoule heatingElectroplastic effectDislocation densityX-ray diffraction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jai Tiwari Padma Pratheesh O.B. Bembalge Hariharan Krishnaswamy Murugaiyan Amirthalingam S.K. Panigrahi |
spellingShingle |
Jai Tiwari Padma Pratheesh O.B. Bembalge Hariharan Krishnaswamy Murugaiyan Amirthalingam S.K. Panigrahi Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites Journal of Materials Research and Technology AA 6063 Electric-assisted deformation Joule heating Electroplastic effect Dislocation density X-ray diffraction |
author_facet |
Jai Tiwari Padma Pratheesh O.B. Bembalge Hariharan Krishnaswamy Murugaiyan Amirthalingam S.K. Panigrahi |
author_sort |
Jai Tiwari |
title |
Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites |
title_short |
Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites |
title_full |
Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites |
title_fullStr |
Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites |
title_full_unstemmed |
Microstructure dependent electroplastic effect in AA 6063 alloy and its nanocomposites |
title_sort |
microstructure dependent electroplastic effect in aa 6063 alloy and its nanocomposites |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2021-05-01 |
description |
The flow stress reduction during plastic deformation superposed with electric current, commonly referred as ‘electroplasticity’ has been actively researched over the past few decades. While the existence of an electron–dislocation interaction, independent of Joule heating is established, the exact rate controlling mechanism of the observed behaviour lacks consensus. Understanding the governing mechanism is complex due to the combined effect of Joule heating and electron–dislocation interaction. The present work attempts to establish the electroplastic mechanism in AA 6063 alloy and its nanocomposites. The role of microstructure on the electron interaction is investigated by preparing four distinct microstructure from the base alloy. All the samples were subjected to constant amplitude direct current during plastic deformation. The Joule heating effect is decoupled using the experimentally measured temperature history. The potential electroplastic mechanism for the alloy is elucidated by analysing the trend of flow stress reduction with strain and strain rate. It is inferred that micro Joule heating and electron wind effect cannot completely explain the observed electroplastic behaviour in AA 6063. The SiC particles in nano-composites suppressed the electroplastic effect.The observed mechanical behaviour under electric current is in agreement with the trend predicted assuming magnetic depinning mechanism. The reduction of dislocation density quantified using X-ray diffraction is found to concur with the inferred mechanism. |
topic |
AA 6063 Electric-assisted deformation Joule heating Electroplastic effect Dislocation density X-ray diffraction |
url |
http://www.sciencedirect.com/science/article/pii/S2238785421003392 |
work_keys_str_mv |
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