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Materials 2019, 12(2), 245; https://doi.org/10.3390/ma12020245

Size-Dependent Phase Transformation during Gas Atomization Process of Cu–Sn Alloy Powders

1,2
,
1,2,* , 1,2
,
1,2
and
1,2
1
State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology at Shenzhen, Shenzhen 518055, China
2
Flexible Printed Electronic Technology Center, Harbin Institute of Technology at Shenzhen, Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Received: 8 December 2018 / Revised: 1 January 2019 / Accepted: 8 January 2019 / Published: 12 January 2019
(This article belongs to the Section Manufacturing Processes and Systems)
Full-Text   |   PDF [4284 KB, uploaded 12 January 2019]   |  

Abstract

For binary element atomization, it is essential to investigate the phase transformation from liquid to solid as a functions of the droplet sizes, as well as the reaction competitiveness, during gas atomizing solidification of their nuclei. In the present work, a series of phase transformations of undercooled Cu (60.9 wt.%)/Sn droplets were analyzed when atomized by pressure gas. The results indicated that the microstructures of the obtained powders and their morphologies were highly relevant to the droplet size. According to the phase characteristics analyzed by the microstructural observations in combination with the transient nucleation theory, powders with sizes from 10 to 100 μm were divided into three categories, exhibiting lotus-leaf, island, and stripe morphologies. The competitive formation of Cu6Sn5 or Cu3Sn was also controlled by the droplet sizes, and a diameter of approximately 45 μm was identified as the threshold size. After heat treatment at 300 °C for 4 h, the powders consisted of a single η’ Cu6Sn5 phase. The obtained Cu6Sn5 phase powders can be used in the field of high-temperature applications as intermetallic balls for integrated chip interconnects. View Full-Text
Keywords: intermetallics; nucleation and growth; phase transformation; microstructure; high-temperature application intermetallics; nucleation and growth; phase transformation; microstructure; high-temperature application
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pan, H.; Ji, H.; Liang, M.; Zhou, J.; Li, M. Size-Dependent Phase Transformation during Gas Atomization Process of Cu–Sn Alloy Powders. Materials 2019, 12, 245.

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