Abstract
In this paper, the microstructure and properties of as-cast Cu-Y-Zr alloys with different Zr content were studied in order to investigate whether the precipitates in copper alloys would interact with each other by adding Y and Zr simultaneously. As-cast Cu-0.5Y-xZr (wt.%, x = 0.05 and 0.1, nominal composition) alloys were prepared by vacuum melting in this study. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) were used to observe the microstructure of the alloys. The mechanical properties of the alloys were tested by universal material testing machine at room temperature. The effects of Zr content on the microstructure and mechanical properties of the alloys were explored. As shown by the research results, in the as-cast Cu-0.5Y-xZr (wt.%) alloys, the precipitated phase was the Cu5Y/Cu5Zr phase and ranged from 10 nm to 70 nm in size; when the Zr content increased from 0.05 wt.% to 0.1 wt.%, both the tensile strength and elongation rate of the alloys increased; when the Zr content was 0.1 wt.%, the tensile strength was 225 MPa and the elongation rate was 22.5%.
Highlights
Cast copper and copper alloys have excellent heat and electrical conductivity, corrosion resistance, good casting performance, mechanical processing performance, and appropriate strength [1]
It was found that the addition of Y can form a Cu6 Y phase and a Cum (Y, Si)n phase, which acted as dispersion strengthening phases and improved the mechanical properties of the alloys
The results showed that the tensile strength increased from 145 to 200 MPatreatment and the
Summary
Cast copper and copper alloys have excellent heat and electrical conductivity, corrosion resistance, good casting performance, mechanical processing performance, and appropriate strength [1]. They are easy to form complex parts with high efficiency and low cost. Alloying is an important method to improve the mechanical properties of cast copper alloys, which has attracted extensive attention of researchers. Y is a rare earth element which is almost insoluble in a copper matrix at room temperature. It can form compounds with other alloy elements and refine the grain size of copper alloys [3].
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