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Non-isothermal aging of a high-Zn-containing Al–Zn–Mg–Cu alloy: microstructure and mechanical properties

Emami Kervee, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1080/02670836.2017.1410369
  3. Abstract:
  4. The non-isothermal aging behaviour of a newly developed Al–Zn–Mg–Cu alloy containing 17 wt-% Zn was investigated. Hardness and shear punch tests demonstrated that during non-isothermal aging, the mechanical properties of the alloy first increased and then decreased. The best properties were obtained in a sample which was non-isothermally aged upto 250°C with heating rate of 20°C min−1, due to the presence of η′/η (MgZn2) phases. This was confirmed by differential scanning calorimetery. After homogenisation, residual eutectic phases remained at triple junctions or in a spherical form. During aging, these phases transformed into rodlike S (Al2CuMg)-phase at 400°C, with sizes ranging from 50 to 250 nm. The precipitation sequence in this high-Zn alloy was similar to that for conventional Al–Zn–Mg–Cu alloys. © 2017 Institute of Materials, Minerals and Mining
  5. Keywords:
  6. Al–Zn–Mg–Cu alloy ; Eutectic phases ; High-Zn ; Aluminum ; Binary alloys ; Copper alloys ; Differential scanning calorimetry ; Eutectics ; Isotherms ; Magnesium alloys ; Mechanical properties ; Precipitation (chemical) ; Zinc ; Zirconium alloys ; Cu alloy ; Eutectic phasis ; Microstructure and mechanical properties ; Non-isothermal aging ; Precipitation sequence ; Shear-punch tests ; Triple junction ; Zn alloys ; Zinc alloys
  7. Source: Materials Science and Technology (United Kingdom) ; 2017 , Pages 1-10 ; 02670836 (ISSN)
  8. URL: http://www.tandfonline.com/doi/abs/10.1080/02670836.2017.1410369?journalCode=ymst20