Assessment of the solidification behavior and microhardness of Sb-modified Sn-Ag alloys
| Author | Freitas, Pâmella Raffaela Dantas de; Sobral, Bruno Silva; Sousa, Raí Batista de; Paixão, Jeverton Laureano; Carvalho, Zulmara Virginia de; Spinelli, José Eduardo; Silva, Bismarck Luiz | |
|---|---|---|
| Publisher | Microelectronics Reliability | |
| Date | 2025 | |
| Keywords | Solidification Intermetallics Sn-Ag-Sb alloys Microstructure Microhardness | |
| Citation | ||
| Abstract | The present study aims to analyze the effect of antimony (Sb) additions (0.2 % and 2.0 % in wt.%) on the microstructure solidification parameters (cooling rate and growth rate), temperatures related to phase transformation, macrosegregation and microhardness of the Sn-2.0 wt% Ag alloy. The samples have been characterized using techniques such as Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-ray Fluorescence (XRF), X-ray Diffraction (XRD) and Vickers microhardness. Thermodynamic calculations were also performed in order to study the evolution of the solidification and the phase fractions. The microstructures of the Sn-Ag-Sb alloys are completely dendritic with a Sn-rich matrix (β-Sn) surrounded by a eutectic mixture, β-Sn + Ag3Sn. The additions of Sb promoted a slight microstructural refinement and a slight increase in liquidus and solidus temperatures, when compared to the binary alloy. Ag3Sn intermetallics showed fibrous and spherical morphologies, with spherical dominating at cooling rate ṪL > 5.1 °C/s and ṪL > 2.9 °C/s for 0.2 wt.% Sb and 2.0 wt.% Sb, respectively. The Sb increased Vickers microhardness, particularly in the Sn-Ag-2wt.%Sb alloy due to solid-solution and dendritic refinement strengthening | |
| URI | https://repositorio.ufrn.br/handle/123456789/65995 | |
| Collections | CT - DEMAT - Artigos publicados em periódicos |
|---|