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

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

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

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationAdvances in Fracture and Damage Mechanics XII
Pages293-296
Number of pages4
DOIs
Publication statusPublished - Jan 1 2014
Event12th International Conference on Fracture and Damage Mechanics, FDM 2013 - Sardinia, Italy
Duration: Sep 17 2013Sep 19 2013

Publication series

NameKey Engineering Materials
Volume577-578
ISSN (Print)1013-9826

Other

Other12th International Conference on Fracture and Damage Mechanics, FDM 2013
CountryItaly
CitySardinia
Period9/17/139/19/13

All Science Journal Classification (ASJC) codes

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

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