Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature
A surface-hardening treatment for AZ31 magnesium alloy using an atmospheric-pressure plasma jet (APPJ) at room temperature was developed. Magnesium is a potential engineering material because it is lightweight; however, magnesium alloys are difficult to heat-treat because of their low flaming temper...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-07-01
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| Series: | Journal of Magnesium and Alloys |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956721002942 |
| _version_ | 1798037860706680832 |
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| author | Kenta Nakazawa Tatsuki Ohashi Shotaro Saiki Shoichi Kikuchi |
| author_facet | Kenta Nakazawa Tatsuki Ohashi Shotaro Saiki Shoichi Kikuchi |
| author_sort | Kenta Nakazawa |
| collection | DOAJ |
| description | A surface-hardening treatment for AZ31 magnesium alloy using an atmospheric-pressure plasma jet (APPJ) at room temperature was developed. Magnesium is a potential engineering material because it is lightweight; however, magnesium alloys are difficult to heat-treat because of their low flaming temperature. Magnesium alloy specimens were irradiated with a localized atmospheric-pressure plasma jet generated by dielectric-barrier discharge for 180 s in air. The APPJ excited oxygen and nitrogen molecules in the ambient air, resulting in the formation of an oxynitrided layer; oxygen and nitrogen diffusion layer, on the surface of the magnesium alloy. The hardness and elemental distribution for the treated surface were examined. The top surface of the APPJ-treated magnesium alloy achieved a maximum hardness of 108 HV, which was ∼1.7 times greater than that of the untreated surface. Elemental analysis using an electron-probe microanalyzer revealed strong oxygen and nitrogen signals corresponding to the hardened region of the magnesium alloy, meaning that the hardness increased as a result of the formation of the oxynitrided layer. The proposed APPJ treatment is a promising approach for locally hardening magnesium alloys without using a heat treatment. |
| first_indexed | 2024-04-11T21:32:19Z |
| format | Article |
| id | doaj.art-8c4aa77a11b7457ea08b82a63ead8927 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-04-11T21:32:19Z |
| publishDate | 2022-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-8c4aa77a11b7457ea08b82a63ead89272022-12-22T04:01:55ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672022-07-0110718781886Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperatureKenta Nakazawa0Tatsuki Ohashi1Shotaro Saiki2Shoichi Kikuchi3Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu, 432-8561, JapanGraduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8561, JapanGraduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8561, JapanDepartment of Mechanical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu, 432-8561, Japan; Corresponding author.A surface-hardening treatment for AZ31 magnesium alloy using an atmospheric-pressure plasma jet (APPJ) at room temperature was developed. Magnesium is a potential engineering material because it is lightweight; however, magnesium alloys are difficult to heat-treat because of their low flaming temperature. Magnesium alloy specimens were irradiated with a localized atmospheric-pressure plasma jet generated by dielectric-barrier discharge for 180 s in air. The APPJ excited oxygen and nitrogen molecules in the ambient air, resulting in the formation of an oxynitrided layer; oxygen and nitrogen diffusion layer, on the surface of the magnesium alloy. The hardness and elemental distribution for the treated surface were examined. The top surface of the APPJ-treated magnesium alloy achieved a maximum hardness of 108 HV, which was ∼1.7 times greater than that of the untreated surface. Elemental analysis using an electron-probe microanalyzer revealed strong oxygen and nitrogen signals corresponding to the hardened region of the magnesium alloy, meaning that the hardness increased as a result of the formation of the oxynitrided layer. The proposed APPJ treatment is a promising approach for locally hardening magnesium alloys without using a heat treatment.http://www.sciencedirect.com/science/article/pii/S2213956721002942Magnesium alloyOxynitridingAtmospheric-pressure plasma jetHardnessSurface modificationDiffusion |
| spellingShingle | Kenta Nakazawa Tatsuki Ohashi Shotaro Saiki Shoichi Kikuchi Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature Journal of Magnesium and Alloys Magnesium alloy Oxynitriding Atmospheric-pressure plasma jet Hardness Surface modification Diffusion |
| title | Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature |
| title_full | Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature |
| title_fullStr | Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature |
| title_full_unstemmed | Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature |
| title_short | Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature |
| title_sort | local oxynitriding of az31 magnesium alloy by atmospheric pressure plasma treatment at room temperature |
| topic | Magnesium alloy Oxynitriding Atmospheric-pressure plasma jet Hardness Surface modification Diffusion |
| url | http://www.sciencedirect.com/science/article/pii/S2213956721002942 |
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