Directional Solidification and Liquidus Projection of the Sn-Co-Cu System

Chen, Sinn-wen; Chang, Jui-shen; Pan, Kevin; Hsu, Chiou-Ting; Hsu, Che-Wei

doi:10.1007/s11661-012-1545-2

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…The Co 3 Sn 2 intermetallic compound (IMC) has been aroused researchers' attention in recent years [12][13][14][15]. It has an ordered hexagonal NiAs-type (P6 3 /mmc) crystal structure above 570 K and transforms into disorder orthorhombic Ni 3 Sn 2 -type (Pnma) structure at lower temperatures [16].…”

Section: Introductionmentioning

confidence: 99%

“…It has an ordered hexagonal NiAs-type (P6 3 /mmc) crystal structure above 570 K and transforms into disorder orthorhombic Ni 3 Sn 2 -type (Pnma) structure at lower temperatures [16]. The melt undercooling and composition of the alloy are two significant factors that affect the formation of unusual dendrite growth morphology of Co 3 Sn 2 IMC [12][13][14]. Meanwhile, prior studies have shown that Co 3 Sn 2 intermetallic compound precipitates from the melt as the primary phase and displays a high volume fraction once Sn content exceeds 30 at% in the ternary (Co 0.5 Cu 0.5 ) (100−x) Sn x alloys during near-equilibrium solidification [15].…”

Section: Introductionmentioning

confidence: 99%

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Primary dendrite growth of Co3Sn2 intermetallic compound in rapidly solidified ternary Co35Cu35Sn30 alloy

et al. 2018

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The rapid solidification of ternary Co 35 Cu 35 Sn 30 alloy droplets with 20-785 µm diameter was realized by drop tube technique, aiming to investigate the dendrite growth mechanism of primary Co 3 Sn 2 intermetallic compound at high cooling rate. As alloy droplet diameter decreases, the surface segregation occurs prior to the solidification process with an increased probability, and the segregation shell becomes more apparent. The dendrite growth of primary Co 3 Sn 2 compound dominates the droplet solidification process, which evolves from equiaxed dendrite to spherical grain and is accompanied by remarkable grain refinement with the decrease of droplet diameter. Meanwhile, a peculiar zone near the droplet surface in which the primary Co 3 Sn 2 compound grows directionally is observed. This directional structure becomes more evident as droplet diameter decreases, which is attributed to the temperature gradient along the radial direction inside droplet. In each alloy droplet, owing to the increased cooling rate from the center to the surface, the grain size decreases accordingly.

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