Author/Authors :
Liu، نويسنده , , Wenguan and Han، نويسنده , , Han and Ren، نويسنده , , Cuilan and He، نويسنده , , Xiujie and Jia، نويسنده , , Yanyan and Wang، نويسنده , , Song and Zhang، نويسنده , , Wei and Li، نويسنده , , Zhijun and Zhou، نويسنده , , Xingtai and Zou، نويسنده , , Yang and Huai، نويسنده , , Ping and Xu، نويسنده , , Hongjie، نويسنده ,
Abstract :
Tellurium (Te) can lead to stress corrosion cracking in Ni-based Hastelloy N alloy. A first-principles investigation is presented to clarify this mechanism by simulating a Σ 5(0 1 2) symmetrical tilt grain boundary (GB) with the existence of Te. In accordance with previous studies, we confirm preferential substitutional occupation of Te in the GB region. Te tends to form strong bonds with the neighboring Ni atoms. However, Te induces the GB expansion due to the mismatch in atom size, and thus weakens the interfacial Ni–Ni bonds which are essential to the GB cohesion. The effect of the Te concentration in GB is also investigated.
Keywords :
Grain boundary , Stress corrosion cracking , Tellurium , First-Principles Calculations , Hastelloy N alloy
