Metallurgical and Materials Transactions A

, Volume 33, Issue 6, pp 1755–1763 | Cite as

Hydrogen-assisted deformation and fracture behaviors of Al 8090

  • Wookil Jang
  • Sangshik Kim
  • Kwangseon Shin
Article
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Abstract

In the present study, the hydrogen embrittlement (HE) and the hydrogen-assisted fracture (HAF) behaviors of electrochemically hydrogen-charged Al 8090 with different specimen orientations and aging practices were examined using smooth bar and single-edge notch (SEN) specimens. It was found that the cathodic hydrogen charging substantially reduced the tensile ductility and the resistance to fracture of Al 8090. The susceptibility to HE and HAF of Al 8090 was strongly dependent on specimen orientations and aging practices. Hydrogen attack was the most significant along the grain boundaries, and, consequently, T-S oriented SEN and T-oriented smooth-bar specimens showed the highest susceptibility among the orientations studied. The susceptibility to HE and HAF decreased from underaging (UA) temper to overaging (OA) temper. It is speculated that the formation and development of a precipitate-free zone (PFZ) along the grain boundaries, rather than the change in slip planarity with prolonged aging is responsible for the reduced susceptibility to HE and HAF. Further studies are, however, required to confirm this notion.

Keywords

Material Transaction Hydrogen Embrittlement Tensile Elongation Hydrogen Charge Prolonged Aging 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2002

Authors and Affiliations

  • Wookil Jang
    • 1
  • Sangshik Kim
    • 2
  • Kwangseon Shin
    • 3
  1. 1.the School of Materials Science and EngineeringSeoul National UniversitySeoulKorea
  2. 2.the Division of Materials Science and Engineering, Research Center for Aircraft Parts TechnologyGyeongsang National UniversityChinjuKorea
  3. 3.the Center for Advanced Aerospace MaterialsSeoul National UniversitySeoulKorea

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