Interfacial Microstructure
Residual Gold Plating At Interface
An interfacial-microstructure image where the key issue is interfacial development and reaction completeness rather than a dramatic crack or burn site.
Interpretation
Why this image matters
This image is valuable because it teaches a different kind of interpretation problem. The question is not “where is the crack?” but “what does this interface microstructure say about process adequacy?”
The report concluded that the soldering time-temperature profile was not optimized and used interfacial microstructure as part of that reasoning.
It works well in the library as a reminder that some high-value images document process margin rather than visible catastrophic damage.
process-microstructure
residual-gold-plating
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soldering-profile
Use this when
Best comparison value
- Teaching interfacial microstructure rather than only damage morphology
- Discussing incomplete reaction or marginal process profile
- Explaining why some quality risks show up before visible cracking or failure
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