We used molecular dynamics methods to study the deformation behavior of metallic alloy crystal nanowires of pure Cu, NiCu alloy and NIAu alloy, under hihg rates of uniaxial tensile strain, rnaging from 5*10 sup 8/s to 5*10 sup 10/s. These nanowires are just about 2 nm thick and hence cannot sustain dislocations, instead we find that deformation proceeds through twinning and coherent slipping mechanisms. NiAu has a 13
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