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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of Y and Ni addition on liquid immiscibility in Cu-Zr-Ag ternary alloys
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Effect of Y and Ni addition on liquid immiscibility in Cu-Zr-Ag ternary alloys

机译：添加Y和Ni对Cu-Zr-Ag三元合金液体不溶混性的影响

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摘要

Liquid immiscibility was studied in Cu-Zr-Ag-Y and Cu-Zr-Ag-Ni liquid alloy systems. In case of Y addition the liquid decomposes into an Ag-Y rich liquid (L_1) and into a Cu-Zr rich liquid (L_2). In case of Ni addition the separated liquid phases are Ag-rich and Cu-Zr-Ni rich liquids. Different microstructures were found as function of the volume fraction of the L_1 liquid phase. The Y addition increased the field of miscibility gap of the ternary Cu-Zr-Ag system to a greater extent compared to Ni addition. Also, the rate of coalescence of droplets in the Cu-Zr-Ag-Y system was considerably larger compared to the Cu-Zr-Ag-Ni system. These two observations are interconnected: increased miscibility means more positive excess Gibbs energy, which leads to higher liquid/liquid interfacial energy, being the driving force of coalescence. Alloys with different compositions taken from the tip of the wedge have been studied by DSC. The amorphous fraction progressively reduces when increasing the Ag-content. A small amount of amorphous phase was detected by DSC in the alloy with Ag contents of not greater than 50 at%.
机译：在Cu-Zr-Ag-Y和Cu-Zr-Ag-Ni液态合金体系中研究了液体不溶混性。在添加Y的情况下，液体分解成富含Ag-Y的液体（L_1）和分解成富含Cu-Zr的液体（L_2）。在添加镍的情况下，分离的液相为富银和富铜-锆-镍的液体。发现不同的微观结构是L_1液相体积分数的函数。与镍相比，Y的添加在更大程度上增加了三元Cu-Zr-Ag系统的混溶间隙场。而且，与Cu-Zr-Ag-Ni系统相比，Cu-Zr-Ag-Y系统中的液滴的聚结速率明显更大。这两个观察是相互联系的：增加的可混溶性意味着更多的正Gibbs能量过量，这导致更高的液/液界面能，这是凝聚的驱动力。 DSC已研究了从楔形尖端截取的具有不同成分的合金。当增加Ag含量时，非晶分数逐渐减少。用DSC法在Ag含量不大于50at％的合金中检测到少量的非晶相。

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