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, cilt.145, sa.2, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 145 Sayı: 2
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1115/1.4056158
  • Dergi Adı: Journal of Engineering Materials and Technology
  • Derginin Tarandığı İndeksler: 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
  • Anahtar Kelimeler: aluminum 7075, hydrogen embrittlement, tensile tests, strain rate, microstructural characterization, constitutive relations, elastic behavior, fracture, mechanical behavior, metals, polymers, ceramics, intermetallics, and their composites, microstructure property relationships, plastic behavior
  • Abdullah Gül Üniversitesi Adresli: Evet

Özet

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.