Micro-analyses of small cracks in 6061-T6 aluminium alloy subjected to high-cycle fatigue

Yoshimasa Takahashi, Takahiro Shikama, Hiroshi Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The growth of a small crack controlling the high-cycle fatigue life of a precipitation-strengthened 6061-T6 aluminium alloy was critically investigated. As the applied stress lowered, the small crack was arrested for a long period (over 106 cycles) at grain boundaries before regrowth, which resulted in a significantly slow growth process. The morphological and crystallographic details of the small crack were then analyzed with focused ion beam and transmission electron microscopy. It was revealed that the small crack was formed along fine persistent slip bands (PSBs) whose structure was fairly different from that reported for other metals. The concept of PSB-limited fatigue strength may be extended to include the present material type.

Original languageEnglish
Title of host publicationAdvances in Fracture and Damage Mechanics XI
Pages213-216
Number of pages4
DOIs
Publication statusPublished - Dec 6 2012
Event11th International Conference on Fracture and Damage Mechanics, FDM 2012 - Xian, China
Duration: Sep 18 2012Sep 21 2012

Publication series

NameKey Engineering Materials
Volume525-526
ISSN (Print)1013-9826

Other

Other11th International Conference on Fracture and Damage Mechanics, FDM 2012
CountryChina
CityXian
Period9/18/129/21/12

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Takahashi, Y., Shikama, T., & Noguchi, H. (2012). Micro-analyses of small cracks in 6061-T6 aluminium alloy subjected to high-cycle fatigue. In Advances in Fracture and Damage Mechanics XI (pp. 213-216). (Key Engineering Materials; Vol. 525-526). https://doi.org/10.4028/www.scientific.net/KEM.525-526.213