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Metals 2016, 6(8), 182; doi:10.3390/met6080182

Effects of Current Stressing on the Grain Structure and Mechanical Properties of Ag-Alloy Bonding Wires with Various Pd and Au Contents

1
Wire Technology Co. LTD., Taichung 432, Taiwan
2
Institute of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Soran Birosca
Received: 9 May 2016 / Revised: 19 July 2016 / Accepted: 1 August 2016 / Published: 4 August 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
View Full-Text   |   Download PDF [7876 KB, uploaded 4 August 2016]   |  

Abstract

Ag-alloy bonding wires containing various Pd and Au elements and traditional 4 N Au and Pd-coated 4 N Cu bonding wires were stressed with a current density of 1.23 × 105 A/cm2 in air. The amounts of annealing twins in the Ag-alloy wires were much higher than those in Au and Pd-coated Cu wires. The percentages of twinned grains in these Ag-alloy wires increased obviously with current stressing. However, the grains in Ag-3Pd and Ag-15Au-3Pd grew moderately under current stressing, in contrast to the dramatic grain growth in the other bonding wires. In addition, the breaking loads and elongations of the various Ag-alloy wires changed slightly, similar to the case of Au wire. The results implied that degradation of the mechanical properties of these annealing twinned Ag-alloy wires due to electromigration was limited. Pd-coated Cu wire was severely oxidized after current stressing for only 1 h in air, which drastically degraded both the breaking load and elongation. View Full-Text
Keywords: Ag-alloy bonding wires; current stressing; grain growth; mechanical properties Ag-alloy bonding wires; current stressing; grain growth; mechanical properties
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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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Chuang, C.-H.; Tsai, C.-H.; Lin, Y.-C.; Lin, H.-J. Effects of Current Stressing on the Grain Structure and Mechanical Properties of Ag-Alloy Bonding Wires with Various Pd and Au Contents. Metals 2016, 6, 182.

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