Effect of environmental relative humidity on hydrogen-induced mechanical degradation in an Al–Zn–Mg–Cu alloy

Mahdieh Safyari, Tomohiko Hojo, Masoud Moshtaghi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The influence of relative humidity (RH) on mechanical properties of a 7075 alloy, cold finished aluminum wrought product, was studied by slow strain rate technique in atmospheres with various RHs. Hydrogen was introduced into specimens from the testing environment during deformation and then thermal desorption spectrometry was utilized to determine the content of absorbed hydrogen. By increasing the RH in slow strain rate tensile tests, the ultimate tensile strength remained unchanged, the content of hydrogen increased, and the total tensile elongation reduced, revealing an increase in the hydrogen embrittlement sensitivity (HES). In RHs below 40%, the HES was insignificant. However, by increasing the RH, a sharp increase in HES was observed due to the formation of secondary cracks. The results firstly showed that even a normal humidity (40–60%) of the testing environment at room temperature can lead to a significant HES in a wrought aluminum alloy.

Original languageEnglish
Article number110489
JournalVacuum
Volume192
DOIs
Publication statusPublished - 2021 Oct

Keywords

  • Aluminum alloy
  • Al–Zn–Mg–Cu
  • Fracture morphology
  • Hydrogen embrittlement
  • Relative humidity

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Effect of environmental relative humidity on hydrogen-induced mechanical degradation in an Al–Zn–Mg–Cu alloy'. Together they form a unique fingerprint.

Cite this