Abstract
A nanostructured surface layer of ∼300 μm thickness was fabricated on Cu-30Cr (wt%) hypereutectic alloy by a continuous laser beam with high power density (1.08 × 107 W/cm2). The average grain size of Cr-rich particles was refined to ∼40 nm, and the solid solubility limit of Cr in Cu was extended to 1.96 at. %. Experimental results show that the dispersion of nano-sized Cr-rich spheroids in Cu-rich matrix was attributed to the Brownian motion of Cr-rich spheroids, and the high cooling rate (5.75 × 106 K/s) during liquid phase separation which inhibits the collisions between Cr-rich spheroids.
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