Roughening improves hydrogen embrittlement resistance of Ti-6Al-4V

The role of β pockets resulting from Fe impurities in hydride formation in titanium

“…the location of the hydrogen evolution reaction, thus the ingress of H is through the β phase. Hydrogenation in CP-Ti therefore first proceeds through the β phase, in which the diffusion rate is higher, and remains in solid solution with high solubility, Fig 4c, which is consistent with the reported literature [30,32]. Some hydrogen can also be trapped at the phase and grain boundaries, and the network of grain boundaries can provide faster diffusion paths in-between the β pockets.…”

“…The α/β phase boundary has been proposed as an effective trapping site for hydrogen in α+β alloys, e.g. in Ti-6Al-4V [30][31][32]. Meanwhile the α/β boundaries has been shown to be the heterogeneous nucleation sites for hydrides in α+β alloys and are generally considered the main crack propagation pathway for brittle failure [33,34].…”

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

“…HE refers to the phenomena that materials lose load-bearing capacities or damage resistances abruptly under the influence of hydrogen. HE was first reported in iron and steel in year 1875 [92], while thence found in Ti alloys, Al alloys, superalloys, etc [93][94][95][96]. HE is particularly dangerous and often causes catastrophic failure of engineering structures without any sign because of its unavoidable and unpredictable invasion into materials during manufacturing and service [97][98][99].…”

Deciphering Hydrogen Embrittlement Mechanisms in Ti6Al4V Alloy: Role of Solute Hydrogen and Hydride Phase

“…The proven resilience in demanding conditions and adherence to stringent mechanical specifications make Ti64 highly suitable for various applications within the aerospace sector [ 1 ]. However, hydrogen embrittlement (HE) remains a significant challenge that adversely affects the performance of the components working in hydrogen environments [ 5 , 6 , 7 , 8 , 9 ]. Exceeding a critical hydrogen concentration triggers hydrogen embrittlement in Ti64, causing a substantial reduction in both strength and ductility.…”

“…Previous studies have mainly concentrated on the effects of hydrogen charging on the interaction of hydrogen with microstructure, leading to the formation of HP or the mere presence of SH [ 5 , 7 , 10 , 13 , 15 ]. Some studies have also indicated the roles of HP in reducing mechanical properties through tensile tests [ 6 , 8 , 16 , 17 ]. Exploring the formation of different hydrogen variants and their mechanisms influencing HE behavior has remained elusive.…”