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．鉴于许多金属间化合物都表现出较强的氢脆敏感性［１－５］，因而有必要研究该合金在室温条件下的氢致开裂性能及其与组织结构的关系．本工作采用单边缺口试?...
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.
参考文献
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| [2] | StoloffNS．In:HydrogenEffectsonMaterialBehavior,EditedbyMoodyNR,ThompsonAW．TheMinerals,MetalsandMaterialsSociety,1990,p4832ZhangDZ,ChuWY,HaialJM．Scripta．Metal．Mater,1992,26:273ChuWY,ThompsonAW,WilliamsJC．ActaMetal．Mater,1992 |
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