Interrelationship of thermal parameters, microstructure and microhardness of directionally solidified Bi–Zn solder alloys

Microstructure Growth Morphologies, Macrosegregation, and Microhardness in Bi–Sb Thermal Interface Alloys

“…In addition to the formation of aligned Bi‐rich dendrites, it can be seen that two morphological transitions occur in the Bi‐rich matrix as follows: trigonal pattern → irregular shape → trigonal pattern. The occurrence of trigonal structures has already been reported in some other solidification studies involving Bi‐based alloys . Moreover, the presence of pronounced trigonal dendritic structure for an as‐cast Bi–22 at% Sb (Bi–14.11 wt% Sb) alloy has also been identified in the study reported by Fanciulli et al Although the Bi‐rich phase is presented with a trigonal dendritic morphology for Bi–5, 15, and 20% Sb alloys, arrays of irregular‐shaped dendrites are characterized along the entire length of the Bi–10 wt% Sb alloy casting.…”

“…The occurrence of trigonal structures has already been reported in some other solidification studies involving Bi-based alloys. [28,29,34] Moreover, the presence of pronounced trigonal dendritic structure for an as-cast Bi-22 at% Sb (Bi-14.11 wt% Sb) alloy has also been identified in the study reported by Fanciulli et al [44] Although the Bi-rich phase is presented with a trigonal dendritic morphology for Bi-5, 15, and 20% Sb alloys, arrays of irregular-shaped dendrites are characterized along the entire length of the Bi-10 wt% Sb alloy casting. Although the microstructure morphology of the Bi-10 wt% Sb alloy differs from those of the other examined alloys, the presence of irregular-shaped dendrites is in agreement with the findings in the study by Li et al, [28] who reported that with no experienced temperature-induced LLT, an irregular-shaped pattern microstructure of the Bi-10 wt% Sb alloy is expected to occur.…”

“…In contrast, Malik et al, [33] who have also used hardness testing as an alternative approach to analyze the effect of quenching from different temperatures on the grain size of Bi-12 wt% Sb alloy samples, have not identified any significant change in microhardness. Although some investigations have proposed Hall-Petch-type equations to describe the microstructure dependence on the resulting properties for some Bi-based alloys, [34,35] there is a lack of systematic studies concerning the influence of the variation of Sb content in Bi-Sb binary alloys on the correlation between the representative length scale of the microstructure and microhardness for a broad range of solidification cooling rates.…”

“…Quantitative processing-microstructure-property correlations have been previously developed for alloys of the Bi-Zn, [34] Bi-Ag, [35] and Bi-Sn [36] systems using a directional solidification technique in transient heat-transfer conditions. This experimental approach has a great advantage of promoting fast and slow cooling conditions experienced along the length of a same alloy casting, allowing, consequently, a wide range of microstructural length scales to be characterized through a single solidification experiment.…”

In-Bi-Cd ÖTEKTİK ALAŞIMININ MİKROYAPISAL DEĞERLENDİRİLMESİ VE MEKANİK DAVRANIŞI

“…Sn-Bi, Sn-Cu, Sn-Sb, Sn-Ag, Sn-Zn ve Au-Sn yanı sıra bu sistemlerin bazı üçlü ve dörtlü katkılanmış türevleri de literatürde tanımlanmıştır [8][9][10][11][12][13][14][15][16]. Kalay esaslı kurşunsuz lehimlerle ilgili çok sayıda araştırma yapılmasına rağmen, geleneksel Sn-Pb alaşımı tarafından sağlanan özelliklerin spektrumunu kapatabilecek henüz standart bir lehim alaşımı mevcut değildir [17].…”