High-strength and high-conductivity Cu-0.7Mg-0.1Ca alloy fabricated via heat treatment and severe plastic deformation
J. Min. Metall. Sect. B-Metall., 61 (1) (2025) 43-58. DOI:10.2298/JMMB241017004K
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Available online 09 May 2025
(Received 17 October 2024; Accepted 09 April 2025)
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In this research, the effect of annealing in combination with severe plastic deformation (SPD) by the MaxStrain component of the Gleeble thermo-mechanical testing device on the microstructural characteristics, tensile behavior, and electrical conductivity of a Cu-0.7Mg-0.1Ca (wt%) alloy was investigated. The as-cast material was subjected to two treatments: annealing at 923 K for 15 min, followed by cooling in air, and annealing at 923 K for 75 min, followed by quenching in agitated water, which resulted in irregular and partially spheroidized Cu5Ca particles. Subsequent MaxStrain deformation resulted in a remarkable grain refinement by dynamic recrystallization (DRX), in which the annealed and quenched sample exhibited a higher DRX fraction than the annealed and air-cooled sample. As a result, the annealed and quenched samples showed a better synergy between strength and ductility, while these improvements were accompanied by only ~1% reduction in electrical conductivity. Accordingly, the present work demonstrated that annealing and subsequent SPD processing is as an effective method for processing high-strength and high-conductivity (HSHC) copper alloys.
Keywords: Annealing; Maxstrain deformation; Simulation; Microstructure; Tensile properties; Four-wire Kelvin resistance measurement
Correspondence Address:
A. Kalhor,
Faculty of Materials Engineering, Silesian University of Technology, Katowice, Poland;
email: alireza.kalhor@polsl.pl
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