Visualization of trapped hydrogen along grain boundaries and its quantitative contribution to hydrogen-induced intergranular fracture in pure nickel

Kentaro Wada, Junichiro Yamabe, Hisao Matsunaga

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8 Citations (Scopus)

Abstract

The phenomenon of hydrogen-trapping and its quantitative contribution to hydrogen-induced intergranular (IG) fracture were studied using a combination of thermal desorption analysis, secondary ion mass spectrometry and slow strain rate tensile tests. Hydrogen was trapped along grain boundaries (GBs) with a binding energy of ≈20 kJ/mol, accompanied by IG sulfur. The true fracture stress and fracture surface morphology were strongly dependent on the concentration of trapped hydrogen, leading to the conclusion that the hydrogen-induced IG fracture of pure Ni is controlled by the concentration of hydrogen trapped along GBs, and not by the concentration of lattice hydrogen.

Original languageEnglish
Article number100478
JournalMaterialia
Volume8
DOIs
Publication statusPublished - Dec 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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