Giga-cycle property of a new age-hardened aluminium alloy containing excess solute magnesium

Yoshimasa Takahashi, Hiroaki Yoshitake, Takahiro Shikama, Hiroshi Noguchi, Masanori Takuma

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

The giga-cycle property of a newly developed Al alloy, which contains 0.5wt.% excess Mg solute compared to a standard age-hardened 6061 alloy (6061-T6), was investigated by using smooth specimens subjected to ultrasonic fatigue. The fatigue strength of the new alloy was higher than that of a normal 6061 alloy particularly at relatively low stress amplitude level. Several analyses (surface crack observation, fractography, FIB cross-sectioning, etc.) were also conducted to reveal the micro-mechanism of the observed strength properties. The following results were obtained: i) No fatigue limit was confirmed for both 6061 and new alloy. ii) Total life (Nf) of 6061 and new alloys was determined by a single fatigue crack initiated from a surface PSB crack. iii) Crack initiation resistance defined by N25 (number of cycles to reach ρ = 25 mm-2, where ρ is the PSB crack number density) for new alloy was higher than that of 6061. iv) The higher fatigue strength of new alloy was explained by the effect of excess Mg solute which increased the resistance against the formation of PSB cracks.

本文言語英語
ホスト出版物のタイトルAdvances in Fracture and Damage Mechanics XII
ページ293-296
ページ数4
DOI
出版ステータス出版済み - 1 1 2014
イベント12th International Conference on Fracture and Damage Mechanics, FDM 2013 - Sardinia, イタリア
継続期間: 9 17 20139 19 2013

出版物シリーズ

名前Key Engineering Materials
577-578
ISSN(印刷版)1013-9826

その他

その他12th International Conference on Fracture and Damage Mechanics, FDM 2013
Countryイタリア
CitySardinia
Period9/17/139/19/13

All Science Journal Classification (ASJC) codes

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

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