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Abstract Cr-rich precipitates with a bcc crystal structure are an equilibrium phase in high-strength Cu–Cr alloys. Metastable fcc Cr-rich precipitates that are coherent with a fcc Cu matrix were retained… Click to show full abstract
Abstract Cr-rich precipitates with a bcc crystal structure are an equilibrium phase in high-strength Cu–Cr alloys. Metastable fcc Cr-rich precipitates that are coherent with a fcc Cu matrix were retained in a Cu–Cr–Zr–Ti alloy during ageing. Atom-probe tomography analysis revealed that Cr atoms exist in the core of the Cr-rich precipitates, whereas Zr atoms segregate on the periphery. Fcc Cr-rich precipitates are prone to form because of the low nucleation barrier. A rapid diffusion of Ti atoms in the matrix stimulates the fcc Cr-rich nuclei growth. Resulting solute-lean zones hinder further nucleation of equilibrium bcc Cr-rich precipitates.
Journal Title: Journal of Alloys and Compounds
Year Published: 2018
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