1. Microstructural characteristics and mechanical properties of extruded Al-4Cu-1Li-0.4Mg-0.1Zr-xZn alloy.
- Author
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Sun, Jiangwei, Zhang, Liang, Wu, Guohua, Zhang, Xiaolong, Rong, Mian, and Wang, Cunlong
- Subjects
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ALUMINUM-copper alloys , *METAL microstructure , *MECHANICAL properties of metals , *ZINC alloys , *PARTICLE size distribution - Abstract
Abstract The microstructures and mechanical properties of cast and extruded Al-4Cu-1Li-0.4Mg-0.1Zr- x Zn alloys were investigated and the amount of Zn additions was up to 1.1 wt%. The results showed that Zn addition could bring additional MgZn 2 phases at the grain boundary and slightly refine the grain size in the as-cast alloy. The mechanical properties of extruded Al-4Cu-1Li-0.4Mg-0.1Zr -x Zn alloy increased gradually with the Zn content under different conditions. The yield strength (YS) and ultimate tensile strength (UTS) of T8 treated (stretched by 4% and aged at 150 °C for 32 h) 1.1 Zn alloy could reach 639 MPa and 666 MPa, while elongation (EL) remained at 10.9%. For alloys peak-aged at 175 °C for 32 h (T6 treated), Zn could effectively promote the precipitation of T 1 phases (Al 2 CuLi) but decrease the volume fraction of θ′ phases (Al 2 Cu) in the matrix. The coarsening of T 1 phases could be obviously suppressed by the addition of Zn under overaged condition. However, the precipitate of T 1 phases promoted by Zn under the T8 condition is not as obvious as the T6 condition. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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