Plasma Nitriding of Al–Cu and Al–Cu–Mg Alloys at Various Holding Temperature
<p>A plasma nitriding has been highlighted as a surface treatment to harden aluminum alloys and improve their wear resistance. Various processing approaches were reviewed to describe the nitriding processes at relatively high temperatures. Duralumin and super-duralumin alloys, such as Al–Cu an...
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| Autores principales: | , , |
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| Formato: | Capítulo de libro |
| Lenguaje: | inglés |
| Publicado: |
IntechOpen
2026
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| Materias: | |
| Acceso en línea: | https://www.intechopen.com/chapters/1228087 |
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| Sumario: | <p>A plasma nitriding has been highlighted as a surface treatment to harden aluminum alloys and improve their wear resistance. Various processing approaches were reviewed to describe the nitriding processes at relatively high temperatures. Duralumin and super-duralumin alloys, such as Al–Cu and Al–Cu–Mg alloys, were nitrided by DC- and RF-DC plasmas at holding temperatures ranging from 723 K to 623 K. An AlN (Aluminum Nitride)-rich layer formation characterized the nitriding behavior of Al–Cu alloys at 673 K. The intermetallic precipitate of Al<sub>2</sub>Cu facilitated this fast-rate AlN-layer formation as a catalyst. This process was affected at 723 K by Mg diffusion and surface oxidation in the case of plasma nitriding of Al–Cu–Mg alloys. The plasma nitriding at 623 K was free from this deterioration, allowing the AlN-rich layer to form in a manner similar to the nitriding of Al–Cu alloys. This layer exhibited a hardness greater than 1,000 HV, which is 10 times higher than the original hardness of Al–Cu–Mg alloys. A heatsink was plasma nitrided at 623 K to demonstrate that aluminum alloy parts could be homogeneously nitrided to form the AlN-rich layer. The plasma nitriding at temperatures lower than 600 K was investigated to explore the possibility of nitrogen supersaturation in aluminum alloys, as well as the accommodated nitriding process via intermetallic precipitates other than Al<sub>2</sub>Cu.</p> |
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| ISBN: | 978-1-83635-707-0 |
| DOI: | 10.5772/intechopen.1014134 |