Whisker (metallurgy) & GOLD plated FFC

Metal whiskers are a crystalline metallurgical phenomenon whereby metal grows tiny, filiform hairs. The effect is primarily seen on elemental metals but also occurs with alloys.
The mechanism behind metal whisker growth is not well understood, but seems to be encouraged by compressive mechanical stresses including:

- residual stresses caused by electroplating;
- mechanically induced stresses;
- stresses induced by diffusion of different metals; and
- thermally induced stresses.

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