Ni_3Al+NiAl双相合金的氢致开裂  

HYDROGEN-INDUCED CRACKING FOR TWO PHASE (Ni_3Al+NiAl) ALLOY

作　　者：李金许[1] 李红旗[1] 王燕斌[1] 乔利杰[1] 褚武扬[1] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083

出　　处：《金属学报》2001年第10期1049-1052,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究专项基金G1999065000;国家自然科学基金59895150

摘　　要：利用恒载荷试样和 ＷＯＬ试样研究了 Ｎｉ３Ａｌ＋ＮｉＡｌ双相合金中氢致裂纹形核的规律以及氢致滞后断裂归一化门槛应力σｃ／σｆ与试样中可扩散氢含量 ｗｈｏ的关系.结果表明，氢致裂纹择优在 ＮｉＡｌ相中或 Ｎｉ３Ａｌ／ＮｉＡｌ相界面处形核扩展；Ｎｉ３Ａｌ能阻碍氢致裂纹扩展.恒载荷实验表明，氢致滞后断裂门槛应力随可扩散氢含量的对数线性下降，即σｃ／σｆ＝０.５８－０.０４２ｌｎ　Ｈｏ。The rule of hydrogen-induced crack nucleating and the threshold stress for hydrogen-induced delayed failure as a function of diffusible hydrogen concentration were studied. The results show that hydrogen-induced crack nucleated preferencially in NiAl phase and/or at Ni(3)AI/NiAl interface. Ni3Al could arrested hydrogen-induced crack propagating. The normalized threshold stress for hydrogen-induced delayed failure decreases linearly with the logarithm of the diffusible hydrogen concentration W-H0, i.e. sigma(c)/sigma(f)=0.58-0.042 ln w(H0).

关 键 词：氢致开裂 NI-AL合金 归一化门槛应力 金属间化合物 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]