Ni3Al+NiAl双相合金的氢致开裂.pdf

第37卷第10期 仓属学般 Vol37No．10 2 001年10月 ACTAMETALLLrRGICASINICA October2001 Ni3Al+NiAl双相合金的氢致开裂+ 李金许 李红旗 王燕斌 乔利杰 褚武扬 (北京科技大学材料物理与化学系．北京100083) 摘要 58一o0421n 阻碍氧致裂纹扩展恒载荷实验表明，氢致滞唇断裂门槛应力随可扩散氢含量的对数线性下降，即口。／口f=o wa。 关键词氯致开裂，Ni—Al台金，山一化门槛应力 中图法分类号TGlll．91，TGl46文献标识码A HYDRoGEN_INDUCEDCRACKINGFoRTWo PHASE(NiaAI+NiAI)ALLoY LI Jinxu，．LIHongqi,WANGYanbin，QIAOL彬e，CHUWuyang ofMaterialsand ofScienceand 100083 PhysicsChemistry,UniversiWTechnology Department Beijing，Beijing Correspondent：L1Jinzu．associate E-mail：协inxu@sohu．∞m received2000 revised2001-05-17 Manuscript 40-03，in form ABSTRACTTheruleof crack andthethresholdstressfor hychogen一4nducednucleating hydrogen— induced fMlureasafunctionofdiffusibfie conce]nt,rationwerestudieTheresults delayed hydrogen crack inNiAl in- showthat nucleated at hy,drogen-一4nduced prefereneiallyphaseand／orNisAl／NiAl couldarrested crack Thenormalizedthresholdstress terrace．NisAl propagating hydrogen_4nduced for induced failuredecreaseswiththe ofthediffusible hydrogenldelayed linearly logarithm hydrogen concentration In WH r)，te．ac／af=0．58～o．042WHn KEYWoRDS crack．Ni-Al thresholdstress hydrogen一4nducedalloy,normalized NiAl金属间化合物是潜在的高温结构材料但由于