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(a–c,e) BSE images of the microstructure (a,e) in the bottom of the as cast and (c) the heat-treated alloy ZX4. (b) shows details of area indicated by rectangle in (a). (d) X-ray maps showing the NbCr2 Laves phase and the Sn rich precipitates formed in the αNb5Si3. In (e) the arrow points away from the water cooled crucible wall and the dashed line indicates the change in microstructure from the bottom to the bulk (see text).
