Effect of Ce and Y on Microstructures and Properties of Al-11.0Zn-3.1Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti Alloy
Source abstract
Abstract
The effects of rare earth elements (Ce and Y) additions with the same content (0.3 wt.%, mass fraction) on microstructure evolution and mechanical properties of the Al-11.0Zn-3.1Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti alloy (base alloy) were investigated. The addition of Ce and Y refined the grain size and led to aging precipitates, which were dominated by the fine and compactly distributed GP (Guinier Preston) zones and the formed η′ (MgZn2) phase, improving the tensile properties of the alloy. The Ce-containing alloy possessed the highest tensile strength and elongation of 768.5 MPa and 8.0%, respectively. Meanwhile, the large atomic radius and low electronegativity of Ce and Y led to the discontinuous distribution of grain boundary precipitates (GBPs) and the broadening of the precipitate-free zones (PFZs) in the alloys, resulting in the improvement of intergranular corrosion resistance (IGC) of the rare earth modified alloys compared with the base alloy, with the best results for the Y-containing alloys.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
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References (41)
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