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Bi–Pb alloy at the eutectic composition was unidirectionally solidified upwards with five different growth rates (V = 7.05–113.09 μm/s) at constant temperature gradient (G = 2.18 K/mm) in a Bridgman type directional growth furnace in order to investigate dependency of eutectic spacing (λ), minimum undercooling (ΔT) and microhardness (HV) on the growth rates (V). The values of λ and HV were measured...
In this paper, the Nb–22Ti–14Si–4Cr–2Al–2Hf alloy was processed by liquid-metal-cooled directional solidification with the withdrawal rates of 20, 100, 300, 400 and 800μm/s. The morphology and volume fraction of eutectic cells (Nb SS +Nb 5 Si 3 ) varied with the withdrawal rate and the impact was remarkable. The formation rule of eutectic was also deduced. When the withdrawal...
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