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Title: Advances in Pb-free solder microstructure control and interconnect design

Journal Article · · Journal of Phase Equilibria and Diffusion
 [1];  [1];  [2];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)

New electronics applications demanding enhanced performance and higher operating temperatures have led to continued research in the field of Pb-free solder designs and interconnect solutions. In this paper, recent advances in the microstructural design of Pb-free solders and interconnect systems were discussed by highlighting two topics: increasing β-Sn nucleation in Sn-based solders, and isothermally solidified interconnects using transient liquid phases. Issues in β-Sn nucleation in Sn-based solders were summarized in the context of Swenson’s 2007 review of the topic. Recent advancements in the areas of alloy composition manipulation, nucleating heterogeneities, and rapid solidification were discussed, and a proposal based on a multi-faceted solidification approach involving the promotion of constitutional undercooling and nucleating heterogeneities was outlined for future research. The second half of the paper analyzed two different approaches to liquid phase diffusion bonding as a replacement for high-Pb solders, one based on the application of the pseudo-binary Cu-Ni-Sn ternary system, and the other on a proposed thermodynamic framework for identifying potential ternary alloys for liquid phase diffusion bonding. Furthermore, all of the concepts reviewed relied upon the fundamentals of thermodynamics, kinetics, and solidification, to which Jack Smith substantially contributed during his scientific career.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1337693
Report Number(s):
IS-J-9093; PII: 476
Journal Information:
Journal of Phase Equilibria and Diffusion, Vol. 37, Issue 4; ISSN 1547-7037
Publisher:
ASM InternationalCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (4)

Chameleon Metals: Autonomous Nano‐Texturing and Composition Inversion on Liquid Metals Surfaces journal December 2019
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Beta-Tin Grain Formation in Aluminum-Modified Lead-Free Solder Alloys journal October 2017
Orientation Relationships of Pure Tin on Single Crystal Germanium Substrates journal October 2019