TY - JOUR
T1 - Emergence of distinct fatigue limit
T2 - 22nd European Conference on Fracture, ECF 2018
AU - Takahashi, Yoshimasa
AU - Kuriki, Ryosuke
AU - Kashihara, Masaki
AU - Shikama, Takahiro
AU - Noguchi, Hiroshi
N1 - Funding Information:
This study was supported in part by the Kansai University Grant-in-Aid for progress of research in graduate course (2017) and also by the Kansai University Fund for Supporting Young Scholars (2017).
Publisher Copyright:
© 2018 The Authors.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
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U2 - 10.1016/j.prostr.2018.12.188
DO - 10.1016/j.prostr.2018.12.188
M3 - Conference article
AN - SCOPUS:85064644808
SN - 2452-3216
VL - 13
SP - 1010
EP - 1013
JO - Procedia Structural Integrity
JF - Procedia Structural Integrity
Y2 - 25 August 2018 through 26 August 2018
ER -