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首页> 外文期刊>Philosophical Magazine Letters >Influence of cooling rate on crystallization and microstructure of the monotectic Ni54Nb23Y23 alloy
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Influence of cooling rate on crystallization and microstructure of the monotectic Ni54Nb23Y23 alloy

机译:冷却速度对单晶Ni54Nb23Y23合金结晶和组织的影响

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摘要

The microstructure of a monotectic Ni54Nb23Y23 alloy, prepared under different casting conditions, was investigated. The alloy exhibits both a liquid miscibility gap and a high glass-forming ability. It was shown that, at moderate cooling rates, a change in the process parameters can drastically alter the morphology of microstructures, whereas the fractions of the Nb7Ni6, NiY and Ni2Y constituent phases themselves remain virtually unchanged. For rapid quenching from melt temperatures T > T-crit, the temperature of liquid phase separation, a phase separated glass is formed, which exhibits compositional heterogeneities with fractal character between 10 and 500 nm size.
机译:研究了在不同铸造条件下制备的单晶Ni54Nb23Y23合金的显微组织。该合金既显示出液体可混溶的间隙,又显示出高的玻璃形成能力。结果表明,在适中的冷却速率下,工艺参数的变化可以极大地改变微观结构的形态,而Nb7Ni6,NiY和Ni2Y组成相的分数实际上保持不变。为了从熔体温度T> T临界温度(液相分离温度)快速淬火,形成了相分离的玻璃,该玻璃表现出分形特征在10至500 nm尺寸之间的组成异质性。

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