期刊
ACTA METALLURGICA SLOVACA
卷 26, 期 4, 页码 161-165出版社
SCICELL SRO
DOI: 10.36547/ams.26.4.663
关键词
Cu-0.5%0Cr alloy; ECAP; DCT; Microstructure; Mechanical properties; Electrical conductivity
资金
- National Natural Science Foundation of China [51561001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
- Science and Technology Project of Changzhou, P. R. China [CZ20180016, CE20170028]
Mechanical properties and electrical conductivity of Cu-0.5%0Cr alloy were simultaneously enhanced by combing the equal channel angular pressing (ECAP) and deep cryogenic treatment (DCT). The effect of DCT on the microstructure and properties of Cu-0.5%Cr alloy prepared by ECAP was investigated. The results show that the grains were elongated and refined along the deformation shear direction, and the dislocation density increased significantly by ECAP deformation. After the subsequent DCT, the grains were further refined, and at the same time, the dislocation density was further increased. With the increase of passes of ECAP, the microhardness and tensile strength of Cu-0.5%0Cr alloy increased significantly, but the elongation to failure and electrical conductivity decreased slightly. After the DCT, the microhardness, electrical conductivity, tensile strength and elongation to failure of the Cu-0.5%0Cr alloy were improved. After the ECAP (four passes) and DCT (12 h), the tensile strength, elongation to failure and electrical conductivity reached 483 MPa, 17.6% and 29%IACS respectively. The improvement of tensile properties could be attributed to the increase of dislocation density and grain refinement. The electrical conductivity was improved by the DCT due to the decrease of vacancy concentration.
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