Formation mechanism of primary phases and eutectic structures within undercooled Pb-Sb-Sn ternary alloys |
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Authors: | Wang WeiLi Dai FuPing Wei BingBo |
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Institution: | Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | The solidification characteristics of three types of Pb-Sb-Sn ternary alloys with different primary phases were studied under
substantial undercooling conditions. The experimental results show that primary (Pb) and SbSn phases grow in the dendritic
mode, whereas primary (Sb) phase exhibits faceted growth in the form of polygonal blocks and long strips. (Pb) solid solution
phase displays strong affinity with SbSn intermetallic compound so that they produce various morphologies of pseudobinary
eutectics, but it can only grow in the divorced eutectic mode together with (Sb) phase. Although (Sb) solid solution phase
and SbSn intermetallic compound may grow cooperatively within ternary eutectic microstructures, they seldom form pseudobinary
eutectics independently. The (Pb)+(Sb)+SbSn ternary eutectic structure usually shows lamellar morphology, but appears as anomalous
eutectic when its volume fraction becomes small. EDS analyses reveal that all of the three primary (Pb), (Sb) and SbSn phases
exhibit conspicuous solute trapping effect during rapid solidification, which results in the remarkable extension of solute
solubility.
Supported by the National Natural Science Foundation of China (Grant Nos. 50121101 and 50395105) |
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Keywords: | undercooling dendritic growth eutectic growth ternary eutectic solute trapping |
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