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Nano-grained (28 nm) samples and coarse-grained (257 nm) reference samples of an Ni80P20 (atomic percentage) alloy have been prepared by means of crystallization of amorphous ribbons. Tensile creep tests at temperatures around 0.5 Tm (Tm is the melting point) show that the activation energies of creep are 0.71 and l.leV, and the stress exponents are 1 2 and 2.5 for the nano-grained and coarse-grained samples, respectively. Based on these data, it is suggested that the creep of the nano-grained samples is mainly controlled by grain (and/or phase) boundary diffusion, while the creep of coarse-grained samples is possibly controlled by a combined mechanism.
Tensile creep tests at temperatures around 0.5 Tm (Tm is the melting). Nano-grained (28 nm) samples and coarse-grained (257 nm) reference samples of an atomic percentage alloy have been prepared by means of crystallization of amorphous ribbons point) show that the activation energies of creep are 0.71 and l.leV, and the stress exponents are 1 2 and 2.5 for the nano-grained and coarse-grained samples, respectively. Based on these data, it is suggested that the creep of the nano-grained samples are mainly controlled by grain (and / or phase) boundary diffusion, while the creep of coarse-grained samples is possibly controlled by a combined mechanism.