Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 649, Issue -, Pages 114-122Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.09.111
Keywords
Copper alloys; Equal-channel angular pressing; Aging; Mechanical properties
Categories
Funding
- Ministry of Science, Industry and Technology under SAN-TEZ program [1533.STZ.2012-2]
- Ministry of Education and Science of the Russian Federation
- Russian Foundation for Basic Research [13-08-00102]
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Properties of Cu-Cr-Zr alloy with ultrafine-grained (UFG) structure produced by equal-channel angular pressing (ECAP) via different routes have been investigated. Special attention was paid to the optimization of multi-functional structural, thermal, electrical and mechanical properties of the alloy by aging of UFG one. Multi-pass ECAP via different routes gives rise to the formation of a deformation-induced submicrocrystalline structure with the grain (subgrain) sizes in the range of 200-300 nm depending on applied routes which leads to high hardness and strength in the Cu-Cr-Zr alloy with reduced ductility. Amongst the applied routes, route-Bc was found to be the best processing path for achieving the lowest grain size, the highest hardness and strength. Aging of 8Bc-processed UFG samples increases the hardness and strength of Cu-Cr-Zr alloy while retaining an electrical conductivity comparable to that of aged coarse-grained (CG) one. A satisfactory electrical conductivity of 71%IACS without considerable loss of peak hardness was achieved after aging of 8Bc-processed UFG alloy at 425 degrees C for 240 mm. The precipitation strengthened UFG alloy remains its stable behavior at elevated temperatures up to 450 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
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