Abstract
We subjected an aged Cu-24wt%Ag ingot to cold drawing to create a high-strength nanostructured composite wire with both Cu-rich proeutectic and Ag-rich eutectic components. During the drawing, a fine lamellar structure (average spacing 20 ± 6 nm) developed in the proeutectic component, which contained a high density of Ag fibers (average width below 5 nm) embedded in the matrix. In the eutectic component, a relatively coarse structure developed, with an average Ag grain size around 100 nm. The result of such a bimodal size of Ag fibers was ultra-high bending plasticity, i.e., the drawn wire tolerated 59% bending strain at the outermost edge, 15 times its tensile elongation (3.6%). During our bending test, dynamic recovery and partial recrystallization occurred more near the inner edge than near the outer edge and primarily in the eutectic component. High bending strain caused some of the thicker Ag fibers to become discontinuous and lose their original alignment. This structural evolution increased local plasticity, resulting in an unexpectedly high achievable bending strain, which is unusual in nano-sized, Ag-fiber-reinforced high-strength composites.
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Acknowledgments
This work was undertaken in the National High Magnetic Field Laboratory, which was supported by the National Science Foundation (DMR-1644779) and the State of Florida. Special thanks to Jun Lu for conducting the heat-treatment, William Starch for conducting the wire swaging, and Mary Tyler for editing.
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Appendix
Peak broadening due to crystallite size, βL, was calculated using Debye–Scherrer’s formula:
where θ is the Bragg angle, K is the Scherrer constant (0.9 for integral breath of spherical crystals with cubic symmetry), λ is the wavelength of Cu kα radiation.
The strain induced broadening, βs, due to crystal imperfection and distortion was calculated using the formula:
Williamson-Hall (W-H) analysis is a simplified integral breadth method where both size-induced and strain-induced broadening were deconvoluted by considering the peak width as a function of 2θ [80, 81]:
where βtot is total peak broadening. By rearranging the above equation, we got
Comparing Eq. 4 to the standard equation for a straight line (\(y = c + mx\), c = intercept; m = slope), we obtained the size component from the intercept (Kλ/size) and the strain component from the slope (4 × strain) by plotting βtot cosθ versus sinθ.
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Niu, R., Han, K., Xiang, Z. et al. Ultra-high local plasticity in high-strength nanocomposites. J Mater Sci 55, 15183–15198 (2020). https://doi.org/10.1007/s10853-020-05097-1
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DOI: https://doi.org/10.1007/s10853-020-05097-1