通过测定非晶态Ｆｅ_（７９）Ｂ_（１６）Ｓｉ_５合金在退火脆化、结构弛豫和晶化时的激活能，分析了合金的延－脆转化机制。非晶态Ｆｅ_（７９）Ｂ_（１６）Ｓｉ_５合金对应于延－脆转化临界点的激活能为１２５ｋＪ／ｍｏｌ，与反映结构弛豫过程中原子间交互作用变化的激活能（８５ｋＪ／ｍｏｌ）相近，而远低于预晶化相α－Ｆｅ析出激活能（３７４－３９９ｋＪ／ｍｏｌ），说明结构弛豫过程中非晶结构的短程有序化是导致脆化的主要原因之一，合金的脆化与晶化无关。
Activation energies for the ductile-brittle transition, structural relaxation and crystallization of the amorphous Fe_(79)B_(16)Si_5 alloy have been determined. The relations of annealing embrittlement with structural relaxation and crystallization have been investigated.The activation energy for ductile-brittle transition is 125 kJ/ mol, which is close to the activation energy for the change of atomic interactions during structural relaxation (85kJ/ mol), but is much lower than that for the formation of α-Fe during the early stage of crystallization (374-399 kJ/ mol). It is apparent that the annealing embrittlement of amorphous Fe_(79)B_(16)Si_5 alloy is related to the atomic short range ordering during structural relaxation. And there is no relationship between the embrittlement behaviour and crystallization.(Correspondent: CHE Xiaozhou, post doctoral, Department of Materials Science, Shanghai Jiaotong University, Shanghai 200030)
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