Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy

Yoshimasa Takahashi, Takahiro Shikama, Ryota Nakamichi, Yuji Kawata, Naoki Kasagi, Hironari Nishioka, Syuzaburo Kita, Masanori Takuma, Hiroshi Noguchi

Research output: Contribution to journalArticle

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Abstract

The effect of additional solute magnesium (Mg) on mechanical and high-cycle-fatigue properties of 6061-T6 aluminum alloy is investigated in detail. By adding 0.5% and 0.8% Mg to the 6061-T6 alloy with a normal stoichiometric Mg2Si composition (base alloy), the alloy exhibits eminent strain-aging characteristics demonstrated by the emergence of serrated flow, the negative strain-rate-sensitivity and relatively weakened temperature dependency of flow stress. The Mg-added new alloy also shows higher work-hardening rate than the base alloy particularly at initial flow regime and at lower strain rate. The S-N curve of the new alloy shows a clear fatigue limit which is absent in the base alloy. The fatigue limit of the new alloy is shown to be controlled by the threshold against small crack growth. Moreover, the new alloy clearly exhibits a coaxing phenomenon (time-dependent strengthening) which is absent in the base alloy. The coaxing effect is attributed to the existence of a small quasi-non-propagating crack whose growth resistance gradually increases during stress amplitude step-ups.

Original languageEnglish
Pages (from-to)263-273
Number of pages11
JournalMaterials Science and Engineering A
Volume641
DOIs
Publication statusPublished - Aug 2 2015

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Magnesium
magnesium
Fatigue of materials
cycles
strain rate
Strain rate
Crack propagation
cracks
precipitation hardening
work hardening
Strengthening (metal)
Plastic flow
Strain hardening
aluminum alloys
Aluminum alloys
solutes
Aging of materials
thresholds
sensitivity
curves

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy. / Takahashi, Yoshimasa; Shikama, Takahiro; Nakamichi, Ryota; Kawata, Yuji; Kasagi, Naoki; Nishioka, Hironari; Kita, Syuzaburo; Takuma, Masanori; Noguchi, Hiroshi.

In: Materials Science and Engineering A, Vol. 641, 02.08.2015, p. 263-273.

Research output: Contribution to journalArticle

Takahashi, Y, Shikama, T, Nakamichi, R, Kawata, Y, Kasagi, N, Nishioka, H, Kita, S, Takuma, M & Noguchi, H 2015, 'Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy', Materials Science and Engineering A, vol. 641, pp. 263-273. https://doi.org/10.1016/j.msea.2015.06.051
Takahashi, Yoshimasa ; Shikama, Takahiro ; Nakamichi, Ryota ; Kawata, Yuji ; Kasagi, Naoki ; Nishioka, Hironari ; Kita, Syuzaburo ; Takuma, Masanori ; Noguchi, Hiroshi. / Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy. In: Materials Science and Engineering A. 2015 ; Vol. 641. pp. 263-273.
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AB - The effect of additional solute magnesium (Mg) on mechanical and high-cycle-fatigue properties of 6061-T6 aluminum alloy is investigated in detail. By adding 0.5% and 0.8% Mg to the 6061-T6 alloy with a normal stoichiometric Mg2Si composition (base alloy), the alloy exhibits eminent strain-aging characteristics demonstrated by the emergence of serrated flow, the negative strain-rate-sensitivity and relatively weakened temperature dependency of flow stress. The Mg-added new alloy also shows higher work-hardening rate than the base alloy particularly at initial flow regime and at lower strain rate. The S-N curve of the new alloy shows a clear fatigue limit which is absent in the base alloy. The fatigue limit of the new alloy is shown to be controlled by the threshold against small crack growth. Moreover, the new alloy clearly exhibits a coaxing phenomenon (time-dependent strengthening) which is absent in the base alloy. The coaxing effect is attributed to the existence of a small quasi-non-propagating crack whose growth resistance gradually increases during stress amplitude step-ups.

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