Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy.
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| Title: | Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy. |
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| Authors: | Derakhshandeh, M. R.1 (AUTHOR), Farvizi, M.1 (AUTHOR) mmfarvizi@yahoo.com, Javaheri, M.1 (AUTHOR) javaheri54@yahoo.com |
| Source: | Journal of Solid State Electrochemistry. 2021, Vol. 25 Issue 1, p279-290. 12p. |
| Subjects: | Shape memory alloys, Nickel-titanium alloys, Torsion, Oxide coating, Pitting corrosion, Transmission electron microscopy |
| Abstract: | In this study, microstructural aspects and electrochemical properties of high-pressure torsion (HPT)-treated austenitic NiTi alloy were investigated. Microstructural characterizations were performed by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) analysis. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used to evaluate the electrochemical properties in simulated body fluid (SBF) solution. It was found that HPT process increased the martensitic phase from 8.22 to 71.31 wt%. HRTEM results revealed a combination of amorphous/nanocrystalline austenitic and martensitic phases of NiTi after HPT. The lower value of corrosion current density of HPT-treated NiTi (2.5 × 10−6A/cm2) was observed compared with the untreated sample (7.6 × 10−6 A/cm2). EIS tests confirmed higher corrosion resistance of the HPT-treated sample. EIS analysis showed a decrease and increase in the impedance value of the specimens at different immersion times indicating the formation and degradation of oxide films over time on the specimens' surface. However, the impedance value of the HPT-treated sample was more than that of the untreated sample. Localized corrosion is observed at the surface of the untreated specimen due to the absence of a dense oxide protective film but no evidence of localized and pitting corrosion on the surface of HPT-treated sample was observed. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Solid State Electrochemistry 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 147999282 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Derakhshandeh%2C+M%2E+R%2E%22">Derakhshandeh, M. R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Farvizi%2C+M%2E%22">Farvizi, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mmfarvizi@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Javaheri%2C+M%2E%22">Javaheri, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> javaheri54@yahoo.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Solid+State+Electrochemistry%22">Journal of Solid State Electrochemistry</searchLink>. 2021, Vol. 25 Issue 1, p279-290. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Shape+memory+alloys%22">Shape memory alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel-titanium+alloys%22">Nickel-titanium alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Torsion%22">Torsion</searchLink><br /><searchLink fieldCode="DE" term="%22Oxide+coating%22">Oxide coating</searchLink><br /><searchLink fieldCode="DE" term="%22Pitting+corrosion%22">Pitting corrosion</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this study, microstructural aspects and electrochemical properties of high-pressure torsion (HPT)-treated austenitic NiTi alloy were investigated. Microstructural characterizations were performed by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) analysis. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used to evaluate the electrochemical properties in simulated body fluid (SBF) solution. It was found that HPT process increased the martensitic phase from 8.22 to 71.31 wt%. HRTEM results revealed a combination of amorphous/nanocrystalline austenitic and martensitic phases of NiTi after HPT. The lower value of corrosion current density of HPT-treated NiTi (2.5 × 10−6A/cm2) was observed compared with the untreated sample (7.6 × 10−6 A/cm2). EIS tests confirmed higher corrosion resistance of the HPT-treated sample. EIS analysis showed a decrease and increase in the impedance value of the specimens at different immersion times indicating the formation and degradation of oxide films over time on the specimens' surface. However, the impedance value of the HPT-treated sample was more than that of the untreated sample. Localized corrosion is observed at the surface of the untreated specimen due to the absence of a dense oxide protective film but no evidence of localized and pitting corrosion on the surface of HPT-treated sample was observed. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Solid State Electrochemistry 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10008-020-04805-w Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 279 Subjects: – SubjectFull: Shape memory alloys Type: general – SubjectFull: Nickel-titanium alloys Type: general – SubjectFull: Torsion Type: general – SubjectFull: Oxide coating Type: general – SubjectFull: Pitting corrosion Type: general – SubjectFull: Transmission electron microscopy Type: general Titles: – TitleFull: Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Derakhshandeh, M. R. – PersonEntity: Name: NameFull: Farvizi, M. – PersonEntity: Name: NameFull: Javaheri, M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 14328488 Numbering: – Type: volume Value: 25 – Type: issue Value: 1 Titles: – TitleFull: Journal of Solid State Electrochemistry Type: main |
| ResultId | 1 |
