The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

Materials

Garima Kapoor¹  Anita Heczel¹  Jenő Gubicza¹  Jana Bidulská²  Dusan Simcak²  Tibor Kvackaj²  Róbert Kočiško²  Zsolt Fogarassy³ 

[1] Department of Materials Physics, Eötvös Loránd University, P.O.B.32, H-1518 Budapest, Hungary;Department of Plastic Deformation and Simulation Processes, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, 042 00 Košice, Slovakia;Institute for Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege út 29-33, H-1121 Budapest, Hungary;

关键词: Cu alloy;    severe plastic deformation;    annealing;    microstructure;    mechanical behavior;   

DOI  :  10.3390/ma13102241

来源: DOAJ

【 摘 要 】

A Cu–1.1%Cr–0.04%Zr (wt.%) alloy was processed by severe plastic deformation (SPD) using the equal channel angular pressing (ECAP) technique at room temperature (RT). It was found that when the number of passes increased from one to four, the dislocation density significantly increased by 35% while the crystallite size decreased by 32%. Subsequent rolling at RT did not influence considerably the crystallite size and dislocation density. At the same time, cryorolling at liquid nitrogen temperature yielded a much higher dislocation density. All the samples contained Cr particles with an average size of 1 µm. Both the size and fraction of the Cr particles did not change during the increase in ECAP passes and the application of rolling after ECAP. The hardness of the severely deformed Cu alloy samples can be well correlated to the dislocation density using the Taylor equation. Heat treatment at 430 °C for 30 min in air caused a significant reduction in the dislocation density for all the deformed samples, while the hardness considerably increased. This apparent contradiction can be explained by the solute oxygen hardening, but the annihilation of mobile dislocations during annealing may also contribute to hardening.

【 授权许可】

Unknown