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Appl. Sci. 2019, 9(3), 392; https://doi.org/10.3390/app9030392

Effect of Aging Treatment on Microstructural Evolution of Rapidly Solidified Eutectic Sn-Pb Alloy Powders

1
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2
General Research Institute for Non-ferrous Metals, Beijing 100088, China
*
Author to whom correspondence should be addressed.
Received: 3 January 2019 / Revised: 21 January 2019 / Accepted: 22 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue Selected Papers from the NMJ2018)
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Abstract

The microstructural stability of rapidly solidified eutectic Sn–Pb alloy solder powders was investigated through aging at room temperature (25 °C) and temperatures of 40 °C–120 °C. The coarsening behavior of the Pb-rich phase both at room and elevated temperatures was observed. The evident coarsening of the Pb-rich phase was detected upon storage after 40 days. At elevated temperatures, a similar sequence of Pb-rich phase coarsening was observed; however, it occurred substantially more quickly. Pb-rich coarsening rate kinetics at different temperatures were estimated using the Arrhenius equation. The apparent activation energy was 45.53 ± 4.23 KJ/mol, which indicates that grain boundary diffusion is a crucial mass transport mechanism controlling Pb-rich phase coarsening under annealing. View Full-Text
Keywords: coarsening; Sn-Pb alloy powders; aging treatment; microstructure coarsening; Sn-Pb alloy powders; aging treatment; microstructure
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Yan, J.; Zhu, D.; Liu, Y.; Xu, J. Effect of Aging Treatment on Microstructural Evolution of Rapidly Solidified Eutectic Sn-Pb Alloy Powders. Appl. Sci. 2019, 9, 392.

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