High temperature creep of nanocrystalline Fe-B-Si alloy

<正> Tensile creep of nano-gramed (27 nm) and coarse-grained (250 nm) samples of Fe78B13S19 alloy has been studied at temperatures around 0.5 Tm( Tm is the melting point). The strain-time relations in the primary creep of both grained samples arc found to obey the Andrade’s exponential law. The stress exponents and activation energies measured in the steady state creep indicate that the creep of the nano-gramed samples is controlled by grain (and/or phase) boundary diffusion, while the creep of coarse-grained samples is controlled by a combined mechanism. The creep of the Fe-B-Si alloy exhibits the same feature as that of Ni-P alloy reported in our previous work.