The Effect of Strain Rate on the Hydrogen Embrittlement Susceptibility of Aluminum 7075

BALTACIOĞLU M. F., Cetin B., BAL B.

Journal of Engineering Materials and Technology, vol.145, no.2, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 145 Issue: 2
  • Publication Date: 2023
  • Doi Number: 10.1115/1.4056158
  • Journal Name: Journal of Engineering Materials and Technology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, DIALNET, Civil Engineering Abstracts
  • Keywords: aluminum 7075, and their composites, ceramics, constitutive relations, elastic behavior, fracture, hydrogen embrittlement, intermetallics, mechanical behavior, metals, microstructural characterization, microstructure property relationships, plastic behavior, polymers, strain rate, tensile tests
  • Abdullah Gül University Affiliated: Yes

Abstract

Copyright © 2022 by ASME.The effects of changing the strain rate regime from quasi-static to medium on hydrogen susceptibility of aluminum (Al) 7075 were investigated using tensile tests. Strain rates were selected as 1 s−1 and 10−3 s−1 and tensile tests were conducted on both hydrogen uncharged and hydrogen charged specimens at room temperature. Electrochemical hydrogen charging method was utilized and the diffusion length of hydrogen inside Al 7075 was modeled. Material characterizations were carried out by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) and microstructural observations of hydrogen uncharged and hydrogen charged specimens were performed by scanning electron microscope (SEM). As opposed to earlier studies, hydrogen embrittlement (HE) was more pronounced at high strain rate cases. Moreover, hydrogen enhanced localized plasticity (HELP) was the more dominant hydrogen embrittlement mechanism at slower strain rate but coexistence of hydrogen enhanced localized plasticity and hydrogen enhanced decohesion was observed at a medium strain rate. Overall, the current findings shed light on the complicated hydrogen embrittlement behavior of Al 7075 and constitute an efficient guideline for the usage of Al 7075 that can be subject to different strain rate loadings in service.