The formation kinetics of Cr2O3dispersed Cu synthesized by Cryo-milling
Source abstract
Abstract
Abstract Nano-crystalline (nc) Cu with Cr2O3dispersoid (~4 vol.%) was successfully made by reactive-milling at 210 K with a mixture of pure Cu, Cu2O, and Cr powder. The vacuum hot pressing (HP) was performed at 1123 K and 50 MPa for 2h to consolidate the milled powder for further analysis. TEM (Transmission Electron Microscopy) work revealed that the HPed materials were comprised with a mixture of the nc-Cu and a homogeneous distribution of Cr2O3dispersoids. The microstructure and Vickers hardness of the as-milled powder and the HPed materials were characterized by standard metallographic techniques. The grain size of the Cu was measured using Scherrer’s formula (XRD) and TEM observation; the Cr2O3dispersoid size was estimated from the HADDF (High Angle Annular Dark Field) images and element mapping by STEM-EDS (Scanning Transmission Electron Microscopy-Energy Dispersive Spectroscopy) works. The formation kinetics and coarsening of the Cr2O3dispersoids in Cu matrix were discussed based on the calculations with thermodynamic parameters in comparison with those of Al2O3.
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Research context
OpenAlex topics: Advanced materials and composites · Microstructure and mechanical properties · Metallic Glasses and Amorphous Alloys
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Affiliations
Dep’t of Materials Science and Engineering , Daejin University , Hokook 1007, Pocheon , Kyung-gi, 11159, Republic of Korea , Tel./Fax: +82 539 1984/1980
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