🚀 go-pugleaf

It has long been known that certain characteristics of metals will
change upon exposure to low temperatures and that such change in
properties may be retained.  Excuse me if I'm rehashing old stuff, but
you can get martensitic transitions to occur in certain steels at high
as well as at low temperatures.

You can get over certain potential barriers either by (i) adding heat
to a system or (ii) squeezing the componentns of the system closer
together as occurs by thermal expansion (or contraction in the case
at hand).

Now with a bimettalic interface, you can have a tremendous and sudden
buildup of interfacial stress if you cool the system down rapidly.  That
stress can only build up so far before something finds a way to relieve
itself.
-- 
                                                John Berryhill, Ph.D.