Effect of Y and Ni addition on liquid immiscibility in Cu-Zr-Ag ternary alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:615

Article; Proceedings Paper

Janovszky, Dora¹  Tomolya, Kinga¹  Sveda, Maria¹  Sycheva, Anna¹  Kaptay, George² 

[1] MTA ME Mat Sci Res Grp, Miskolc, Hungary

[2] Bay Zoltan Appl Res Nonprofit Ltd, Dept Nanomat, H-3519 Miskolc 2, Igloi, Hungary

关键词: Ag-Cu-Zr alloy;    Liquid-liquid separation;    Miscibility gap;    Monotectic;    Rapid solidification;   

DOI  :  10.1016/j.jallcom.2013.12.087

来源: Elsevier

【 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%. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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