The answer is a tinned crimp-sleeve or a tinned mechanical sleeve
Here's one http://www.rshughes.com/products/054007_13319.html
Hope this helps

"Cecil Moore" wrote in message
...
I'm no metallurgist so forgive my ignorance. Most of
us have had the problem of interfacing copper to
aluminum. Is there some sort of alloy terminal block
that will accomplish that feat? Seems simple enough
to create an alloy that gradually transitions from
copper to aluminum but what do I know?
--
73, Cecil http://www.w5dxp.com