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The hypoeutectic alloy, with nominal composition NiAl–31Cr–2.9Mo–0.1Hf–0.05Ho (at.%), was directionally solidified at three different withdrawal rates by liquid metal (Sn) cooling technique. Microstructural examination reveals that directional solidification gave rise to a shift in the coupled zone for the eutectic growth towards the Cr(Mo) phase. With the withdrawal rates increasing from 3 mm/min...
An eutectic multiphase alloy NiAl–28Cr–5.94Mo–0.05Hf–0.01Ho (at.%) was directionally solidified by liquid metal cooling technique at withdrawal rates of 3, 8 and 10mmmin −1 . The microstructure and tensile properties of alloys at room temperature, 1253K and 1373K were investigated. With the increase of withdrawal rate, the microstructure was refined including the refinement of eutectic cells...
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