材料科学
微观结构
压痕硬度
合金
极限抗拉强度
共晶体系
冶金
扫描电子显微镜
维氏硬度试验
灰烬
相(物质)
复合材料
相图
有机化学
化学
作者
Cássia Carla de Carvalho,Bruno Silva Sobral,Raí Batista de Sousa,Jeverton Laureano Paixão,S. L. A. Dantas,José Eduardo Spinelli,Bismarck Luiz Silva
标识
DOI:10.1002/adem.202401074
摘要
The present aims to evaluate the effect of adding Zn (0.5% and 9.0% in wt%) on phase transformation temperatures, microstructure coarsening, solidification parameters (cooling rate‐ L and growth rate‐V L ), macrosegregation, and mechanical properties of directionally solidified Sn‐34wt%Bi‐xZn alloys. The samples have been characterized by optical microscopy, scanning electron microscopy, X‐ray fluorescence, and X‐ray diffraction, in addition to Vickers microhardness and tensile tests. The CALPHAD method has been used for thermodynamic computations via Thermo‐calc software, in order to obtain thermodynamic data. The microstructure of Sn–Bi–Zn alloys is mainly dendritic, composed of a Sn‐rich matrix (β‐Sn) with Bi precipitates inside and surrounded by a Sn+Bi eutectic mixture of phases, predominantly observed at the coarse scale. Coarse Zn needles are also observed in the Sn‐34wt%Bi‐9wt%Zn alloy due to the high Zn content. On the whole, Zn provoked a coarsening of the dendritic arrangement. Moreover, Zn additions cause inverse segregation of Bi, as compared to the rather constant macrosegregation profile observed in the binary Sn–Bi alloy. On the whole, both additions of Zn (0.5 and 9.0) promoted increase in Vickers microhardness, yield strength ( σ Y ), and ultimate tensile strength ( σ u ), however, causing an overall reduction in elongation‐to‐fracture ( δ ).
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