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Microstructure of rapidly solidified laser molten AI-4.5 Wt Pct cu surfaces

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Abstract

The microstructure of rapidly solidified laser molten or electron beam molten Al-4.5 wt pct Cu alloyed surfaces has been investigated. A variety of electron microscopy techniques was employed. The epitaxially resolidifying melt undergoes three different solidification modes: about 3 μm to 5 μm of material near the fusion line resolidify in a plane front mode. The next bulk resolidifies in a cellular dendritic mode, which then turns dendritic. The major impact of resolidification is refinement of the surface microstructure, which by itself shows various characteristics for the different resolidification modes. Particularly, the validity of the relationship of secondary interdendritic arm spacing, as inversely dependent on the one-third power of the average local cooling rate, was verified for cooling rates up to 106 K per second.

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  1. Nuclear Research Center, Negev, Metallurgy Laboratory, P. O. Box 9001, Beer Sheva, Israel

    A. Munitz

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  1. A. Munitz
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Munitz, A. Microstructure of rapidly solidified laser molten AI-4.5 Wt Pct cu surfaces. Metall Trans B 16, 149–161 (1985). https://doi.org/10.1007/BF02657500

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