Journal ArticleDOI
Formation of aluminium nitride during sintering of powder injection moulded aluminium
TLDR
In this paper, a detailed transmission electron microscopy study of the structure of aluminium nitride formed during sintering of powder injection molded aluminium is presented, where a polycrystalline layer formed on Al particle surfaces exposed to a nitrogen atmosphere.Abstract:
A detailed transmission electron microscopy study of the structure of aluminium nitride formed during sintering of powder injection moulded aluminium is presented. A polycrystalline layer formed on Al particle surfaces exposed to a nitrogen atmosphere. This layer consisted of fine, rod-like crystallites of hexagonal AlN typically aligned normal to the Al surface. A double layer of AlN separated by a thin layer of Al was observed at the interfaces between Al grains. In this report, the structure of the nitride is characterised and its influence on sintering is discussed.read more
Citations
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In situ fabrication and mechanical properties of Al–AlN composite by hot extrusion of partially nitrided AA6061 powder
TL;DR: In this paper, the in situ formed AlN reinforcements are present as nanoscale AlN whiskers on each powder particle and the composite powder was consolidated by hot extrusion at 450 °C with an extrusion ratio of 11:1.
Journal ArticleDOI
A morphological study of nitride formed on Al at low temperature in the presence of Mg
TL;DR: In this paper, a detailed study was conducted of AlN formed at low temperature on Al with the aid of Mg. The nitride exhibits a bilayer structure comprising a layer forming outward and a layer growing into the Al.
Journal ArticleDOI
Metal injection moulding of in-situ formed AlN hollow sphere reinforced Al matrix syntactic foam parts
TL;DR: In-situ formed AlN hollow sphere reinforced Al matrix syntactic foam parts have been fabricated by metal injection moulding, partial nitridation and a subsequent "open-closed pore transformation" without using pre-fabricated ceramic hollow spheres.
Journal ArticleDOI
In situ fabrication and properties of AlN dispersion strengthened 2024 aluminum alloy
TL;DR: Nanoscaled aluminum nitride (AlN) dispersion strengthened 2024 aluminum alloy was fabricated using a novel approach in which Al-Mg-Cu compacts were partially nitrided in flowing nitrogen gas.
Journal ArticleDOI
Fabrication of Porous Aluminum with Controllable Open-Pore Fraction
TL;DR: In this article, an open-pore structure was fabricated by nitridation of an AA6061-2 pct Mg-1 pct Sn powder mixture, where interconnected permeable AlN shells developed on each AA 6061 particle and imparted strength to the assembly.
References
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Journal ArticleDOI
Surface oxide and the role of magnesium during the sintering of aluminum
TL;DR: The effect of trace additions of magnesium on the sintering of aluminum and its alloys is examined in this paper, where the optimum magnesium concentration is approximately 0.1 to 1.0 wt pct.
Journal ArticleDOI
Rapid Manufacturing of Aluminum Components
TL;DR: The simplicity and rapidity of this process in comparison to conventional production routes, combined with the ability to fabricate complicated parts of almost any geometry and with high dimensional precision, provide an additional means to manufacture aluminum components.
Journal ArticleDOI
The influence of the atmosphere on the sintering of aluminum
G. B. Schaffer,B. J. Hall +1 more
TL;DR: In this article, the outer layers of the porous powder compact serve as a getter for the inner layers such that the oxygen partial pressure is reduced deep within the pore network.
Journal ArticleDOI
Nitridation reactions of molten Al-(Mg, Si) alloys
H. Scholz,Peter Greil +1 more
TL;DR: In this article, the isothermal nitridation of magnesium-and silicon-doped aluminium melt at 1273 K was investigated, where four major reaction mechanisms may be separated: (i) a passivating surface nitrification, (ii) a volume nitrication with precipitation of isolated AlN in the aluminium matrix, (iii) a volumetric nitricization resulting in a three-dimensionalally interconnected AlN/Al composite microstructure, and (iv) a break-away nitricisation with complete conversion of aluminium to AlN.
Journal ArticleDOI
A new method for fabrication of dense aluminium nitride bodies at temperatures as low as 1600°C
TL;DR: In this article, the sintering behavior of aluminium nitride in the presence of yttrium oxide associated with calcium aluminate (12CaO. 7Al 2 O 3 ) or CaYAlO 4 ) was studied.
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