摘要
Ｔｉ－２４Ａｌ－１１Ｎｂ金属间化合物的氢致滞后开裂张跃，王忆，王燕斌，褚武扬，肖纪美（北京科技大学北京１０００８３）１引言复相金属间化合物Ｔｉ－２４ＡＬｌｌＮｂ合金是一种重要的新型高温结构材料，已被美国宇航局用作为新一代宇航飞机的发动机材料及结构件．...
The behavior of hydrogen induced delayed cracking(HIDC) of intermetallic compound Ti-24Al-11Nb was investigated with single-edge notched specimens under cathodic charging. It was found that HIDC could occur for all specimens with three different kinds of heat treatment. The threshold values KIH/Kic were 0.43, 0.59 and 0.85 respectively, for specimens solution if eated (ST) at 1000 ℃ and air coooled (KIc=20MPam1/2), those ST at 1150 ℃ and furnace cooled (FC) (KIc=18.4MPam1/2) and those ST at 1000 ℃ FC (KI.=15.7MPam1/2).The experiments also showed that the HIDC of the alloy was induced by atomic hydrogen and not by hydrides. The fractograph of HIDC was dependent on the KI value. Then KI approached KIH, dimples were observed on the fracture surface; when KI became higher, the fractograph of HIDC was cleavage-like,similar to that of overloaded fracture.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1994年第2期143-150,共8页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金
关键词
金属互化物
氢致滞后开裂
组织结构
Intermetallic compound, hydrogen, hydrogen induced delayed cracking
