Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing
In the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve the hydrogen storage properties of AZ91 cast alloy. The processing is conducted at different temperatures, ranging from 340 °C down to 200 °C. The hydrogen absorption and...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/10/1428 |
| _version_ | 1827650809154764800 |
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| author | Mohammad Abdi Ramin Ebrahimi Ebad Bagherpour |
| author_facet | Mohammad Abdi Ramin Ebrahimi Ebad Bagherpour |
| author_sort | Mohammad Abdi |
| collection | DOAJ |
| description | In the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve the hydrogen storage properties of AZ91 cast alloy. The processing is conducted at different temperatures, ranging from 340 °C down to 200 °C. The hydrogen absorption and desorption tests are conducted kinetically at three different temperatures, using a Sievert-type apparatus. Remarkable improvement in the absorption kinetic is achieved as a result of the TPCAE processing. A maximum absorption capacity of 6.1 wt.% within a time span of 2000 s is achieved for the sample with three passes of processing complemented at 250 °C. Also, the kinetic of dehydrogenation is improved significantly and complete desorption at 350 °C is achieved for all the processed samples within a time span of maximum 2500 s. By calculating the activation energy of hydrogenation and evaluating the microstructure changes, it is found that implementing sufficient thermomechanical work level along with applying the last pass of the process at lower temperature results in a reduction of the activation energy and improvement of the hydrogenation kinetic. |
| first_indexed | 2024-03-09T20:25:10Z |
| format | Article |
| id | doaj.art-4919ce497691430cb744af9bfec2ca75 |
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| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T20:25:10Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj.art-4919ce497691430cb744af9bfec2ca752023-11-23T23:38:16ZengMDPI AGCrystals2073-43522022-10-011210142810.3390/cryst12101428Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion ProcessingMohammad Abdi0Ramin Ebrahimi1Ebad Bagherpour2Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz 71348-51154, IranDepartment of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz 71348-51154, IranBrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, Middlesex UB8 3PH, UKIn the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve the hydrogen storage properties of AZ91 cast alloy. The processing is conducted at different temperatures, ranging from 340 °C down to 200 °C. The hydrogen absorption and desorption tests are conducted kinetically at three different temperatures, using a Sievert-type apparatus. Remarkable improvement in the absorption kinetic is achieved as a result of the TPCAE processing. A maximum absorption capacity of 6.1 wt.% within a time span of 2000 s is achieved for the sample with three passes of processing complemented at 250 °C. Also, the kinetic of dehydrogenation is improved significantly and complete desorption at 350 °C is achieved for all the processed samples within a time span of maximum 2500 s. By calculating the activation energy of hydrogenation and evaluating the microstructure changes, it is found that implementing sufficient thermomechanical work level along with applying the last pass of the process at lower temperature results in a reduction of the activation energy and improvement of the hydrogenation kinetic.https://www.mdpi.com/2073-4352/12/10/1428AZ91 magnesium alloysevere plastic deformationhydrogen storagekinetic |
| spellingShingle | Mohammad Abdi Ramin Ebrahimi Ebad Bagherpour Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing Crystals AZ91 magnesium alloy severe plastic deformation hydrogen storage kinetic |
| title | Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing |
| title_full | Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing |
| title_fullStr | Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing |
| title_full_unstemmed | Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing |
| title_short | Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing |
| title_sort | improvement of hydrogenation and dehydrogenation kinetics of as cast az91 magnesium alloy via twin parallel channel angular extrusion processing |
| topic | AZ91 magnesium alloy severe plastic deformation hydrogen storage kinetic |
| url | https://www.mdpi.com/2073-4352/12/10/1428 |
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