Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys
In Al-Mg alloys with Mg content 0 ≤ <i>X</i><sub>Mg</sub> ≤ 6 wt. %, the effects of <i>X</i><sub>Mg</sub> on dissolved hydrogen content ([H]) and melt quality were investigated. [H] was measured using the Closed-Loop Recirculation m...
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MDPI AG
2019-11-01
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| Online Access: | https://www.mdpi.com/2075-4701/9/11/1235 |
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| author | Ho Sung Jang Ho Jeong Kang Pilhwan Yoon Gyuheun Lee Jong Bae Jeon Jin Young Park Eok Soo Kim Sunmi Shin |
| author_facet | Ho Sung Jang Ho Jeong Kang Pilhwan Yoon Gyuheun Lee Jong Bae Jeon Jin Young Park Eok Soo Kim Sunmi Shin |
| author_sort | Ho Sung Jang |
| collection | DOAJ |
| description | In Al-Mg alloys with Mg content 0 ≤ <i>X</i><sub>Mg</sub> ≤ 6 wt. %, the effects of <i>X</i><sub>Mg</sub> on dissolved hydrogen content ([H]) and melt quality were investigated. [H] was measured using the Closed-Loop Recirculation method, and the melt quality was quantified using the density index (DI), bifilm index (BI), and porosity measurement. [H] in the molten alloys increased with increasing <i>X</i><sub>Mg</sub> and melt temperature <i>T</i><sub>Melt</sub>; these trends agree with theoretical calculations for hydrogen solubility. The tendency of melt quality vs <i>X</i><sub>Mg</sub> was similar in DI, BI, and porosity measurements, and the poorest melt quality was observed in the Al-4Mg alloy that had <i>X</i><sub>Mg</sub> = 4 wt. %, whereas the highest [H] was obtained in the Al-6Mg alloy melt that had <i>X</i><sub>Mg</sub> = 6 wt. % Mg. During thermogravimetric/differential thermal analysis, rapid oxidation occurred in the Al-4Mg alloy melt during the holding time between 45 and 60 min at 800 °C, i.e., just before the molten metal was cast. The inferior melt quality of Al-4Mg alloy may have been caused by high-temperature oxidation. |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-12T04:02:16Z |
| publishDate | 2019-11-01 |
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| series | Metals |
| spelling | doaj.art-d3f74523b2b4489da9774f3b518d78022022-12-22T03:48:41ZengMDPI AGMetals2075-47012019-11-01911123510.3390/met9111235met9111235Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg AlloysHo Sung Jang0Ho Jeong Kang1Pilhwan Yoon2Gyuheun Lee3Jong Bae Jeon4Jin Young Park5Eok Soo Kim6Sunmi Shin7Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Surface Coatings & Processing R&D Group, Korea Institute of Industrial Technology, Yangsan 50635, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaAdvanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan 44776, KoreaIn Al-Mg alloys with Mg content 0 ≤ <i>X</i><sub>Mg</sub> ≤ 6 wt. %, the effects of <i>X</i><sub>Mg</sub> on dissolved hydrogen content ([H]) and melt quality were investigated. [H] was measured using the Closed-Loop Recirculation method, and the melt quality was quantified using the density index (DI), bifilm index (BI), and porosity measurement. [H] in the molten alloys increased with increasing <i>X</i><sub>Mg</sub> and melt temperature <i>T</i><sub>Melt</sub>; these trends agree with theoretical calculations for hydrogen solubility. The tendency of melt quality vs <i>X</i><sub>Mg</sub> was similar in DI, BI, and porosity measurements, and the poorest melt quality was observed in the Al-4Mg alloy that had <i>X</i><sub>Mg</sub> = 4 wt. %, whereas the highest [H] was obtained in the Al-6Mg alloy melt that had <i>X</i><sub>Mg</sub> = 6 wt. % Mg. During thermogravimetric/differential thermal analysis, rapid oxidation occurred in the Al-4Mg alloy melt during the holding time between 45 and 60 min at 800 °C, i.e., just before the molten metal was cast. The inferior melt quality of Al-4Mg alloy may have been caused by high-temperature oxidation.https://www.mdpi.com/2075-4701/9/11/1235aluminum alloymelt qualitydissolved hydrogenhigh temperature oxidation |
| spellingShingle | Ho Sung Jang Ho Jeong Kang Pilhwan Yoon Gyuheun Lee Jong Bae Jeon Jin Young Park Eok Soo Kim Sunmi Shin Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys Metals aluminum alloy melt quality dissolved hydrogen high temperature oxidation |
| title | Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys |
| title_full | Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys |
| title_fullStr | Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys |
| title_full_unstemmed | Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys |
| title_short | Effects of Mg Content on Hydrogen Content and Melt Quality of Al-Mg Alloys |
| title_sort | effects of mg content on hydrogen content and melt quality of al mg alloys |
| topic | aluminum alloy melt quality dissolved hydrogen high temperature oxidation |
| url | https://www.mdpi.com/2075-4701/9/11/1235 |
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