Crystallography of phase transitions in metastable titanium aluminium nitride nanocomposites

A new nitriding method has been devised which requires only a simple vacuum furnace and enables direct nitridation of solid aluminium without any prior surface treatment. It can be used to produce thick aluminium nitride surface layers on aluminium, under nitrogen at atmospheric pressure. A critical element of the process is the use of a magnesium vapour source that reduces/disrupts the natural, protective oxide film on the aluminium surface and facilitates nitriding. The nitride surface layers form through two distinct modes, one growing outward from the aluminium plate surface and the other growing into the aluminium. Studies of the nitride layers utilizing optical microscopy, TEM, SEM, XRD and XPS have been conducted. Details of the composition, structure and growth as well as possible mechanisms for the nitride formation are presented. Understanding of the reaction may have important implications for the production of wear resistant coatings on bulk Al as well as for the production of Al/AlN composites.

Aluminium nitride

Aluminium oxides

10.4028/www.scientific.net/msf.561-565.571

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Aluminium nitride

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Chang‐Chun Hsiao

Aluminium nitride

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Daniel M. Giaquinta Hans‐Conrad zur Loye

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Aluminium nitride precipitation and grain structure of continuously cast billet corners

Materials Science and Technology (1990)

Kendrick Walker R. I. Marshall

The highly grain refined corners of continuously cast steel billets and the high levels of associated aluminium nitride precipitation were investigated. From experiments using steels grain refined by the addition of aluminium, it was found that aluminium nitride precipitated during recalescence after the temperature of the billet corners had fallen below the Ar3 temperature in the mould and secondary cooling zone. The aluminium nitride was found to persist and prevent austenite grain growth during reheating to the straightening temperature and this produced the refined grain structure and high aluminium nitride content of the cooled billet.MST/1170

Aluminium nitride

10.1179/026708390790193583

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Citations (0)

Aluminium nitride precipitation and grain structure of continuously cast billet corners

Materials Science and Technology (1990)

Kendrick Walker R. I. Marshall

AbstractAbstractThe highly grain refined corners of continuously cast steel billets and the high levels of associated aluminium nitride precipitation were investigated. From experiments using steels grain refined by the addition of aluminium, it was found that aluminium nitride precipitated during recalescence after the temperature of the billet corners had fallen below the Ar3 temperature in the mould and secondary cooling zone. The aluminium nitride was found to persist and prevent austenite grain growth during reheating to the straightening temperature and this produced the refined grain structure and high aluminium nitride content of the cooled billet.MST/1170

Aluminium nitride

10.1179/mst.1990.6.9.867

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Citations (4)