  We present a study of the elongation and rupture of gold-silver alloy
nanowires. Atomistic details of the evolution were derived from time-resolved
atomic resolution transmission electron microscopy and molecular dynamics
simulations. The results show the occurrence of gold enrichment at the
nanojunction region, leading to a gold-like structural behavior even for alloys
with minor gold content. Our observations have also revealed the formation of
mixed (Au and Ag) linear atomic chains.
