Abstract
The chemical interfacial reaction of Ni plates with eutectic Sn-3.5Ag lead-free solder was studied by microstructural observations and mathematical calculations. Compared with the Sn-3.5Ag-0.75Ni/Ni interfacial reaction, based on a simple model of the growth of the liquid/solid chemical compound layer, the growth mechanism of Ni3Sn4 in the Sn-3.5Ag/Ni interfacial reaction is discussed and presented. The growth process of Ni3Sn4 in the Sn/Ni liquid/solid reaction interface involves the net effect of several interrelated phenomena, such as volume diffusion, grain boundary diffusion, grain boundary grooving, grain coarsening, and dissolution into the molten solder. The growth time exponent n and morphology of Ni3Sn4 were found to be dependent on these factors. © 2009 Acta Materialia Inc.
| Original language | English |
|---|---|
| Pages (from-to) | 5196-5206 |
| Journal | Acta Materialia |
| Volume | 57 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - Oct 2009 |
Research Keywords
- Growth mechanism
- Interfacial reaction
- Microstructure
- Sn/Ni
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