Journal
MATERIALS RESEARCH LETTERS
Volume 10, Issue 4, Pages 257-263Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2022.2035838
Keywords
Copper alloys; precipitation; coarsening; first-principles calculation
Categories
Funding
- National Natural Science Foundation of China [51901250]
- National MCF Energy R&D Program of China [2018YFE0306103]
- Key TechnologiesR&DProgramof Yunnan Province [202102AB080019-1]
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The study demonstrated that the addition of Nb can stabilize metastable Cr3Cu precipitates by reducing the interfacial energy between Cu and Cr, resulting in a higher high-temperature strengthening effect. The Cu-Cr-Nb alloy with stable L1(2) structured Cr3Cu precipitates showed significantly improved high-temperature strength compared to the b.c.c. structured Cr precipitates.
IMPACT STATEMENT TEM images and calculations revealed that Nb can stabilize metastable Cr3Cu precipitates (L1(2)) by reducing the Cu/Cr interfacial energy, and provide a higher high-temperature strengthening effect than b.c.c. Cr. Stable L1(2) structured Cr3Cu precipitates were determined in a Cu-4.06Cr-1.25Nb alloy rather than b.c.c. structured Cr precipitates by transmission electron microscope (TEM) and three-dimension atom probe tomography (3DAP) at 450 C-o. The precipitation sequence of the studied alloy aged at 400 C-o was supersaturated solid solution -> f.c.c. Cr phase -> Cr3Cu phase (L1(2)). Nb atoms would segregate in the interface between the Cu and Cr phase, reduce the Cu/Cr interfacial energy, affect the precipitation, growth, phase transformation, and coarsening of the precipitate. These Cr3Cu precipitates significantly improved the high-temperature strength of the Cu-Cr-Nb alloy (223 +/- 5 MPa at 500 C-o).
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