Dealloyed Cu0.75Pt0.25 demonstrating the
extreme brittle nature of these materials. The
sample was heat treated at 650 C (1200 F) for 30 min
following the dealloying to coarsen the porosity to a size
scale easily observable in the electron microscope. The
as-dealloyed structure consists of pores of 3 nm in
diameter. Both intergranular and transgranular cracking
are common in these materials.