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Morphological transition in the cellular structure of single crystals of nickel-tungsten alloys near the congruent melting point

机译:接近一致熔点的镍钨合金单晶胞结构的形态学转变

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The structure and microhardness of single crystals of nickel-tungsten alloys containing 2536 wt % W are investigated. The temperature gradient at the crystallization front and the velocity of the crystallization front are the variable parameters of directional crystallization. It is found that, when the velocity of the crystallization front is 4 mm/min, the morphology of the cellular structure of the single crystals grown from nickel-tungsten alloys changes from square cells to hexagonal cells at a tungsten content of greater than or equal to 31 wt %. As the velocity of the crystallization front increases to 10 mm/min, no morphological transition occurs. It is shown that impurities play an important role in the formation of a cellular structure with cells of different types. (C) 2005 Pleiades Publishing, Inc.
机译:研究了含钨量为2536 wt%的镍钨合金单晶的结构和显微硬度。结晶前沿的温度梯度和结晶前沿的速度是定向结晶的可变参数。发现当结晶前沿的速度为4mm / min时,由钨-镍合金生长的单晶的蜂窝结构的形态在钨含量大于或等于的情况下从方电池向六角电池变化。至31重量%。当结晶前沿的速度增加到10 mm / min时,不会发生形态学转变。结果表明,杂质在具有不同类型细胞的细胞结构形成中起着重要作用。 (C)2005年Pleiades Publishing,Inc.

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