Welding Phenomena of Aluminum-Copper Alloy in Electron Beam Welding
By Xiang Liu, X. Bian, Jiaji Ma. Materials Science Forum, 2000
229 citations recorded by the source corpus.
Hypoeutectic AI-Si alloys represent the most widely used alloy system for cast aluminium applications. This system has a unique behaviour with respect to grain formation where an increase in silicon content results in a transition to larger grain sizes after a minimum at an intermediate concentration. As a result of the already large solute content, grain refinement by solute additions is inefficient and nucleant particles from the common aluminium grain refiners are not as effective as in wrought alloys. However, casting conditions, such as a low pouring temperature, that promote the formation of wall crystals tie. crystals nucleated in the thermally undercooled layer at or next to mould walls) are very effective in yielding a small grain size. This paper presents results of an investigation of the effect of low superheat and mould preheat temperature on grain size. It was found that pouring temperature controls the effectiveness of the wall mechanism while mould preheat has little effect until high preheat temperatures at which a large increase in grain size occurs. The observed changes in grain size are explained in terms of the balance between nucleation rate and survival rate of crystal nuclei resulting from changes in superheat and mould temperature.
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Citations in the corpus
- Forming of aluminum alloys at elevated temperatures ¿ Part 2: Numerical modeling and experimental verification (2006, background): “These include Li and Ghosh (2003), Ayres (1979), Ayres and Wenner (1979), Painter and Pearce (1980), Takata et al. (2000) , Naka et al. (2001) and Boogaard et al. (2001).”