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On the variability in static and cyclic mechanical properties of extruded 7075-T6 aluminum alloy
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  • Matteo Benedetti,
  • Cinzia Menapace,
  • Vigilio Fontanari,
  • Ciro Santus
Matteo Benedetti
Università di Trento
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Cinzia Menapace
Università di Trento
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Vigilio Fontanari
University of Trento
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Ciro Santus
University of Pisa
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The present paper investigates the variability in the static and cyclic properties of two nominally identical supplies of the aeronautical Al grade 7075-T6. Samples were extracted from extruded bars of 15 mm and 60 mm diameter and with slightly different chemical composition. Noticeable differences were found in tensile strength, total elongation, low- and high-cycle fatigue strength, despite the nearly identical hardness value. The diverse mechanical behavior has been imputed to different extrusion ratio and therefore work hardening along with a more or less fine distribution of precipitates and dispersoids. The high-cycle fatigue strength was found to be in direct correlation with the monotonic yield strength and the size of the largest intermetallic precipitate. A simple equation based on Murakami sqrt(area) parameter is proposed to predict the fatigue endurance. Tensile tests and microstructural analyses are recommended instead of conventional hardness tests to have a tighter quality control on the mechanical properties of semifinished products.

Peer review status:ACCEPTED

08 Mar 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
10 Mar 2021Submission Checks Completed
10 Mar 2021Assigned to Editor
12 Mar 2021Reviewer(s) Assigned
01 Apr 2021Review(s) Completed, Editorial Evaluation Pending
13 Apr 2021Editorial Decision: Revise Minor
14 Apr 20211st Revision Received
15 Apr 2021Submission Checks Completed
15 Apr 2021Assigned to Editor
15 Apr 2021Reviewer(s) Assigned
08 Jun 2021Review(s) Completed, Editorial Evaluation Pending
08 Jun 2021Editorial Decision: Accept