Shaun
Well your first message went through but since I have no hard facts I
thought it might be better to let others answer (I think I already
mentioned that I am quite lazy) but now that nobody cared for you let
me try to "suck something out of my fingers" as we say in German.
What do you mean by grainy? If you refer to the lead phases occurring
in the solder, keep in mind that these are not an indicator on the
grain size of the tin phase. It is for me not very surprising, that an
alloy of Tin and Lead where additional elements such as Palladium are
added will show more dark areas in a microsection than a pure Tin/Lead
alloy since Lead as well as Palladium are visible as dark areas. The
size of the phases depends on the cooling conditions. For Tin/Lead I am
familiar with the effects of cooling rate and phase size. For
Tin/Lead/Palladium I couldn't say much.
Best regards
Guenter
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