Local Deformation and Fracture Behavior of High-Strength Aluminum Alloys Under Hydrogen Influence

Kazuyuki Shimizu, Hiroyuki Toda, Kentaro Uesugi, Akihisa Takeuchi

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)

抄録

The local deformation and fracture behavior of high-Zn Al-Zn-Mg(-Cu) alloys under hydrogen influence were investigated by in situ tests through synchrotron X-ray tomography. Intergranular and quasi-cleavage fractures were induced by hydrogen, and strain localization by the presence of cracks was not observed by 3D strain mapping. These results suggest that the strain localization at the crack tip is smaller than the measurement limit of 3D strain mapping. The average crack-tip-opening displacements, which are one of the crackdriving forces specified by fracture mechanics, directly measured from the tomographic slice were 0.14 and 0.23 μm for intergranular cracks and quasi-cleavage cracks, respectively. The crack driving forces of the intergranular and quasi-cleavage cracks were small. The local deformation behavior at the crack tips was analyzed based on fracture mechanics. The local deformation field of the crack tip, which was characterized using the Rice–Drugan–Sham (RDS) solution rather than the Hutchinson–Rice–Rosengren (HRR) solution, was located within 20 μm of the crack tip, and its size was limited. The results of this work clarify that the intergranular and quasi-cleavage crack growths are caused by small driving forces; however, this behavior is not perfectly brittle, accompanying local deformation at the crack tip.

本文言語英語
ページ(範囲)1-19
ページ数19
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
51
1
DOI
出版ステータス出版済み - 1月 1 2020

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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