On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration
The Mg-Al-Zn-Ca system has demonstrated excellent flame resistance and mechanical properties in the as-cast condition. However, the potential of these alloys to be heat-treated, e.g., by aging, as well as the influence of the initial microstructure on the precipitation kinetics, is yet to be compreh...
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MDPI AG
2023-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/8/3152 |
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| author | Inês V. Gomes Fabrizio D’Errico José L. Alves Hélder Puga |
| author_facet | Inês V. Gomes Fabrizio D’Errico José L. Alves Hélder Puga |
| author_sort | Inês V. Gomes |
| collection | DOAJ |
| description | The Mg-Al-Zn-Ca system has demonstrated excellent flame resistance and mechanical properties in the as-cast condition. However, the potential of these alloys to be heat-treated, e.g., by aging, as well as the influence of the initial microstructure on the precipitation kinetics, is yet to be comprehensively explored. Ultrasound treatment was applied during the solidification of an AZ91D-1.5%Ca alloy to promote microstructure refinement. Samples from treated and non-treated ingots were subjected to solution treatment at 415 °C for 480 min, followed by aging at 175 °C for up to 4920 min. The results showed that the ultrasound-treated material could reach the peak-age condition in a shorter period than the non-treated one, suggesting accelerated precipitation kinetics and, thus, enhanced aging response. However, the tensile properties showed a decrease in the peak age compared to the as-cast condition, probably due to the formation of precipitates at the grain boundaries that promote the formation of microcracks and intergranular early fracture. This research shows that tailoring the material’s as-cast microstructure may positively affect its aging response, shortening the heat treatment duration, thereby making the process less expensive and more sustainable. |
| first_indexed | 2024-03-11T04:48:07Z |
| format | Article |
| id | doaj.art-ea9f0628b1db496aafb9e712edb28bbb |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T04:48:07Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ea9f0628b1db496aafb9e712edb28bbb2023-11-17T20:13:51ZengMDPI AGMaterials1996-19442023-04-01168315210.3390/ma16083152On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic VibrationInês V. Gomes0Fabrizio D’Errico1José L. Alves2Hélder Puga3CMEMS—UMinho, Department of Mechanical Engineering, Campus of Azurém, University of Minho, 4800-058 Guimarães, PortugalDepartment of Mechanical Engineering, Politecnico di Milano, Via La Masa 34, 20156 Milan, ItalyCMEMS—UMinho, Department of Mechanical Engineering, Campus of Azurém, University of Minho, 4800-058 Guimarães, PortugalCMEMS—UMinho, Department of Mechanical Engineering, Campus of Azurém, University of Minho, 4800-058 Guimarães, PortugalThe Mg-Al-Zn-Ca system has demonstrated excellent flame resistance and mechanical properties in the as-cast condition. However, the potential of these alloys to be heat-treated, e.g., by aging, as well as the influence of the initial microstructure on the precipitation kinetics, is yet to be comprehensively explored. Ultrasound treatment was applied during the solidification of an AZ91D-1.5%Ca alloy to promote microstructure refinement. Samples from treated and non-treated ingots were subjected to solution treatment at 415 °C for 480 min, followed by aging at 175 °C for up to 4920 min. The results showed that the ultrasound-treated material could reach the peak-age condition in a shorter period than the non-treated one, suggesting accelerated precipitation kinetics and, thus, enhanced aging response. However, the tensile properties showed a decrease in the peak age compared to the as-cast condition, probably due to the formation of precipitates at the grain boundaries that promote the formation of microcracks and intergranular early fracture. This research shows that tailoring the material’s as-cast microstructure may positively affect its aging response, shortening the heat treatment duration, thereby making the process less expensive and more sustainable.https://www.mdpi.com/1996-1944/16/8/3152magnesium alloysultrasound treatmentsolutionagingMg<sub>17</sub>Al<sub>12</sub> |
| spellingShingle | Inês V. Gomes Fabrizio D’Errico José L. Alves Hélder Puga On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration Materials magnesium alloys ultrasound treatment solution aging Mg<sub>17</sub>Al<sub>12</sub> |
| title | On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration |
| title_full | On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration |
| title_fullStr | On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration |
| title_full_unstemmed | On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration |
| title_short | On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration |
| title_sort | on the aging kinetics of a flame resistant az91d 1 5 ca magnesium alloy processed with ultrasonic vibration |
| topic | magnesium alloys ultrasound treatment solution aging Mg<sub>17</sub>Al<sub>12</sub> |
| url | https://www.mdpi.com/1996-1944/16/8/3152 |
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