Thermo-Mechanical Response of Monolithic and NiTi Shape Memory Alloy Fiber Reinforced Sn-3.8Ag-0.7Cu Solder. Evangelos Fountoukidis

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66 pages


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Thermo-Mechanical Response of Monolithic and NiTi Shape Memory Alloy Fiber Reinforced Sn-3.8Ag-0.7Cu Solder.  by  Evangelos Fountoukidis

Thermo-Mechanical Response of Monolithic and NiTi Shape Memory Alloy Fiber Reinforced Sn-3.8Ag-0.7Cu Solder. by Evangelos Fountoukidis
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In electronic packaging, the reliability of solders is a critical issue, since serve as both electrical and mechanical connections. The most common failures arise from the thermo-mechanical fatigue (TMF) of solders, due to mismatches in theMoreIn electronic packaging, the reliability of solders is a critical issue, since serve as both electrical and mechanical connections. The most common failures arise from the thermo-mechanical fatigue (TMF) of solders, due to mismatches in the coefficient of thermal expansion between the Si-chip and the printed circuit board.

In order to meet the demands of miniaturization and enhanced performance in severe environments, a novel adaptive Tin-Silver-Copper (SnAgCu) solder reinforced with NiTi shape-memory alloy (particles or fiber) developed. An experimental apparatus has been designed to investigate the thermo-mechanical strain-controlled fatigue life of the solder during both single and multiple thermal cycling under double-shear loading.

For comparison, thermo-mechanical single shear tests were also performed in monolithic Tin-Silver-Copper solder and in solder reinforced with Cu fiber. Also, micro-structural evaluation of the solders during the 5th cycle was possible using Scanning and Optical microcopy together with EDS analysis.



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