(上海大學(xué) 材料研究所，上海200072))
摘 要: 為了闡明金屬間化合物中H2所致脆性的機理及B在抑制這類氫脆的作用，研究了B對無序態(tài)和有序態(tài)Ni3Fe合金氫脆的影響及其預(yù)滲氫后斷口沿晶深度的影響。結(jié)果表明：B能同時降低H在無序態(tài)和有序態(tài)Ni3Fe合金中的表觀擴散系數(shù)，而且不管是否添加B，H在無序態(tài)Ni3Fe合金中的表觀擴散系數(shù)始終大于H在有序態(tài)Ni3Fe合金中的表觀擴散系數(shù)。因此，不能簡單地從B影響Ni3Fe合金中H擴散來解釋B能明顯抑制有序態(tài)Ni3Fe合金在H2中的環(huán)境氫脆。
關(guān)鍵字: Ni3Fe合金；硼；環(huán)境氫脆；無序態(tài)；有序態(tài)
disordered and ordered Ni3Fe alloys
（Institute of Materials Science, Shanghai University, Shanghai 200072, China）
Abstract:In order to understand the mechanism of H2-induced environmental embrittlement and boron effect on inhibitting this kind of embrittlement in intermetallics, the effects of boron doping on the sensitivity to environmental embrittlement of disordered and ordered Ni3Fe alloys and on its intergranular depth after hydrogen charging were investigated. The results show that boron can similarly reduce hydrogen diffusion along grain boundary in both disordered and ordered Ni3Fe alloys. The hydrogen diffusion coefficient in disordered Ni3Fe alloy is always larger than that in ordered Ni3Fe alloy with or without boron. This suggests that the effect of boron on suppressing H2-induced environmental embrittlement in ordered Ni3Fe alloys can not be simply attributed to the fact that boron retards hydrogen diffusion along grain boundaries.
Key words: Ni3Fe alloy; boron; environmental embrittlement; disordered state; ordered state
