Solidification of tin on quasicrystalline surfaces |
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| Authors: | Alok Singh H Somekawa Y Matsushita AP Tsai |
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| Institution: | 1. National Institute for Materials Science, 1-2-1 Sengen , Tsukuba 305-0047 , Japan alok.singh@nims.go.jp;3. National Institute for Materials Science, 1-2-1 Sengen , Tsukuba 305-0047 , Japan;4. National Institute for Materials Science, 1-2-1 Sengen , Tsukuba 305-0047 , Japan;5. Beamline BL15XU, SPring-8, NIMS-branch office , Hyogo 679-5148 , Japan;6. Institute for Multidisciplinary Research in Advanced Materials, Tohoku University , Sendai 980-8577 , Japan |
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| Abstract: | A two-phase alloy of β-Sn and Al63Cu25Fe12 quasicrystal produced by melt-spinning was annealed and aged to form various microstructures of tin in a quasicrystalline (QC) or microcrystalline (MC) matrix. The morphology and structure of the interfaces was studied by scanning and transmission electron microscopy and was related to melting and solidification behavior of tin studied by differential scanning calorimetry. In a MC matrix the tin phase occurred as nanoparticles and solidified with an undercooling of about 35°C. In a QC matrix, tin formed intergranular layers on faceted matrix grains. Tin showed multiple solidification peaks in undercooling ranging from 8°C to 43°C, indicating several distinct nucleation sites which compete with each other and are selected kinetically. The interfacial energy (depending on the structural state of the matrix) had a more dominating effect on the solidification of tin than the size, shape and the distribution of the tin particles. It was also concluded that solidification of tin is easier on quasicrystalline surfaces than on aluminum. |
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| Keywords: | quasicrystal tin solidification transmission electron microscopy phase transformation |
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