Influence of micro-alloying with silver on microstructure and mechanical properties of Al-Cu alloy

The present study aims to investigate the microstructure and mechanical properties of Al-Cu-Zn-Fe-Ti-Mg alloy (≈ 2219 Al-alloy), micro-alloyed with silver (Ag in the range 0 − 0.1 wt%), under different thermo-mechanical process conditions. Investigation of the microstructure of cast alloys revealed...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-04, Vol.722, p.99-111
Main Authors: Mandal, Purnendu Kumar, Robi, P.S.
Format: Article
Language:English
Subjects:
2219 Al-alloy
Age hardening
Aluminum alloys
Aluminum base alloys
Casting alloys
Copper
Dendritic structure
Ductility
Grain boundaries
Heat treatment
Iron
Magnesium base alloys
Manganese
Mechanical properties
Micro-alloying
Microalloying
Microstructure
Silicon
Silver
Thermomechanical treatment
Titanium
Zinc
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Summary:The present study aims to investigate the microstructure and mechanical properties of Al-Cu-Zn-Fe-Ti-Mg alloy (≈ 2219 Al-alloy), micro-alloyed with silver (Ag in the range 0 − 0.1 wt%), under different thermo-mechanical process conditions. Investigation of the microstructure of cast alloys revealed the presence of intermetallic CuAl2 and metastable Al-Cu-Fe-Zn-Si-Mn phases at the grain boundary regions. The as-cast dendritic structure was eliminated by heat treatment and subsequent rolling process resulting in improved mechanical properties. The strength and hardness increased with the increase in silver content up to 0.07 wt% in combination with reasonable ductility. Maximum strength for the alloy was achieved in the rolled and age hardened condition. Fractographic studies revealed brittle failure in as-cast alloys, whereas the heat treated alloys exhibited features typical of ductile failure.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.03.012