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研究了Fe_(78)B_(13)Si_9合金纳米晶(27nm)和粗晶(250nm)试样的高温拉伸蠕变。纳米晶和粗晶试样蠕变初期阶段的应变-时间关系均符合Andrade的指数律。根据稳态蠕变激活能和应力指数的数值,认为纳米晶试样的蠕变由界面扩散机制控制,而粗晶试样的蠕变由一种复合机制控制。文中报道的Fe-B-Si合金与以前报道Ni-P合金高温蠕变的结果有相同的规律。
The high temperature tensile creep of Fe 78 B 13 Si 9 alloy nanocrystalline (27nm) and coarse (250nm) samples was studied. The strain-time relationships of nanocrystalline and coarse-grained samples in the initial creep stage all fit Andrade’s exponential law. According to the values of steady-state creep activation energy and stress index, it is considered that the creep of nanocrystalline samples is controlled by interfacial diffusion mechanism, while the creep of coarse-grained samples is controlled by a complex mechanism. The reported results of Fe-B-Si alloy and high-temperature creep of previously reported Ni-P alloy have the same rules.