Abstract
Fusion zone microstructures in an electron beam welded powder metallurgy Al-8Fe-1.7Ni alloy have been examined using optical and electron microscopy techniques. Near the weld fusion boundary the structure exhibited a coupled eutectic comparable to that of the rapidly-solidified powder from which the alloy was produced. At the center of the fusion zone this eutectic structure transitioned to equiaxed alpha aluminum grains. These grains were nucleated as primary intermetallics, which acted as growth centers for the dendritic alpha aluminum. As expected, STEM microanalysis found considerable compositional variations between the different phases observed.
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