Tailoring hydrogen embrittlement resistance of pure Ni by grain boundary engineering

By using thermo-mechanical processing, 99.996 wt.% pure Ni with different grain boundary characteristics were fabricated(Sample #1, 700℃ × 10 h + cold rolling reduction 50%+ 650℃ × 2 h; Sample #2, 700℃ × 10 h + cold rolling reduction 50%+ 900℃ × 5 min). Hydrogen embrittlement sensitivity of the two samples was determined by using high-pressure hydrogen charging, low strain rate tensile test and SEM fractography. Compared with Sample #1, hydrogen embrittlement index of Sample #2 increased from 0.52 to 0.71. The effects of grain size,grain boundary type and grain boundary curviness on hydrogen embrittlement of pure Ni were discussed. The results indicate that: 1) special grain boundaries including twin grain boundaries may have a marginal effect on tailoring hydrogen embrittlement resistance in pure Ni; 2) increasing grain boundary curviness is an effective way to improve hydrogen embrittlement resistance of Ni.