Abstract
Tensile creep of Ni 80P 20 and Fe 78B 13Si 9 alloys with grain sizes of 27–28 nm has been studied at temperatures around 0.5 T m ( T m is the respective melting point). The strain-time relation in the primary creep is found to obey the Andrade's law. The stress exponents and activation energies measured in the steady state creep indicate that the creep of both the nano-grained alloys is dominantly controlled by grain (and/or phase) boundary diffusion, while in the creep of coarse-grained samples (250–257 nm) of the two alloys, some additional processes are involved.
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