The effects of substitution of Bi for Sn on the soldering properties of near eutectic Sn-Ag-Cu soldering alloys

Ayodele Olofinjana; N Y Voo; M Matahir

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The effects of substitution of Bi for Sn on the soldering properties of near eutectic Sn-Ag-Cu soldering alloys

Conference paper

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The effects of substitution of Bi for Sn on the soldering properties of near eutectic Sn-Ag-Cu soldering alloys

Ayodele Olofinjana, N Y Voo and M Matahir

Proceedings of the 2015 Materials Science and Technology Conference, pp.1715-1723

Materials Science and Technology (MS&T) Conference, 2015 (Columbus, United States, 04-Oct-2015–08-Oct-2015)

Materials Science and Technology (MS&T)

2015

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Abstract

Materials Engineering

Manufacturing Engineering

Pb-free solder

shear strength

intermetallic

off eutectic

We have followed the effects of substitution of Sn with Bi to the near eutectic SAC compositions. It is shown that Bi substitutions up to less than 2% substitution improved the joint strengths peaking at 50 - 70MPa. EDS studies confirmed that the improvement in strength is attributable to solid solution strengthening. The strengthening effect of Bi diminishes vastly beyond 2% limit and are characterised by brittle failure at higher Bi concentrations. Thermal analyses indicating much higher melting range suggest that SACbased compositions with more than 2% Bi had undergone hyper eutectic solidification that would have led to the evolution of primary brittle Bi phase in the microstructure. XRD studies confirmed the existence of primary Bi phase in the alloys with higher concentrations of Bi. This places a limit of maximum of 2wt% on substitution of Bi for Sn in the SAC-Bi alloy in order to retain the benefits of improvement in soldering properties.

Details

Title: The effects of substitution of Bi for Sn on the soldering properties of near eutectic Sn-Ag-Cu soldering alloys
Authors: Ayodele Olofinjana (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
N Y Voo (Author) - Universiti Brunei Darussalam, Brunei Darussalam
M Matahir (Author) - Universiti Brunei Darussalam, Brunei Darussalam
Publication details: Proceedings of the 2015 Materials Science and Technology Conference, pp.1715-1723
Conference details: Materials Science and Technology (MS&T) Conference, 2015 (Columbus, United States, 04-Oct-2015–08-Oct-2015)
Publisher: Materials Science and Technology (MS&T)
Date published: 2015
ISBN: 9781510813939
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449809702621
Output Type: Conference paper

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