Emergence of distinct fatigue limit: Impact of excess solute magnesium in 6061-T6 alloy

Yoshimasa Takahashi, Ryosuke Kuriki, Masaki Kashihara, Takahiro Shikama, Hiroshi Noguchi

Research output: Contribution to journalConference articlepeer-review


The fatigue properties of 6061-T6 aluminum (Al) alloy containing additional solute magnesium (Mg) is studied. As previously reported, this special alloy exhibits eminent strain-aging characteristics which is absent in a normal 6061-T6 alloy with a stoichiometric Mg 2 Si composition. In this study, particular attention is paid to the environmental effect on the fatigue properties of this new alloy. The S-N curves of the alloys are compared in different environments (ambient air, dry air, dry nitrogen). A clear knee-point (fatigue limit), which is atypical to the normal 6061-T6 alloy, appears for the new alloy irrespective of the environment. The fatigue limit is shown to be controlled by the threshold against small crack propagation in all environments. On the other hand, the coaxing effect, the manifestation of a time-dependent strengthening mechanism at the non-propagating crack tip, is clearly observed in the ambient air.

Original languageEnglish
Pages (from-to)1010-1013
Number of pages4
JournalProcedia Structural Integrity
Publication statusPublished - 2018
Event22nd European Conference on Fracture, ECF 2018 - Belgrade, Serbia
Duration: Aug 25 2018Aug 26 2018

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)


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