Effect of Ta Solute Concentration on the Microstructural Evolution in Immiscible Cu-Ta Alloys
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The immiscible Cu-Ta system has garnered recent interest due to observations of high strength and thermal stability attributed to the formation of Ta-enriched particles. This work investigated a metastable Cu-1 at.% Ta solid solution produced via mechanical alloying followed by subsequent consolidation into a bulk specimen using equal channel angular extrusion at 973 K (700°C). Microstructural characterization revealed a decreased number density of Ta clusters, but with an equivalent particle size compared to a previously studied Cu-10 at.% Ta alloy. Molecular dynamic stimulations were performed to understand the thermal evolution of the Ta clusters. The cluster size distributions generated from the simulations were in good agreement with the experimental microstructure.
M. Rajagopalan and K. N. Solanki are grateful for the financial support for this work from the Army Research Laboratory award number W911NF-15-2-0038 and would also like to thank the LeRoy Eyring Center for Solid State Science at Arizona State University. G. P. Purja Pun and Y. Mishin were supported by the U.S. Army Research Office under contract number W911NF-15-1-007.
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