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Influence of cooling speed on the solidification of a hyper‐eutectic CuSn alloy
Author(s) -
Mardare Cezarina Cela,
Hassel Achim Walter
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201100617
Subject(s) - intermetallic , materials science , eutectic system , electron backscatter diffraction , alloy , microstructure , metallurgy , phase (matter) , impurity , scanning electron microscope , monoclinic crystal system , composite material , crystallography , chemistry , crystal structure , organic chemistry
CuSn alloys with a hyper‐eutectic composition (97.53 at% Sn, 2.42 at% Cu and 0.05 at% impurities) were melted in a Bridgman‐type furnace and cooled at different velocities ranging from free fall to 13 µm/s. The formation of the intermetallic phase along the alloys, as well as the size, distribution and microstructure were observed as a function of cooling speed, showing different particle morphologies and growth. The intermetallic phase formed was Cu 6 Sn 5 as confirmed by chemical analysis and X‐ray measurements. Electron backscattered diffraction (EBSD) measurements indicate that the η′‐monoclinic phase of the Cu 6 Sn 5 intermetallic was formed on all samples, together with the β‐Sn.SEM images both transversal and longitudinal cross‐sections of alloys cooled at different velocities.