Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 726, Issue -, Pages 208-214Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.04.077
Keywords
Cu-Cr-Ag alloy; Rolling deformation; Aging treatment; Electrical conductivity
Categories
Funding
- National Key Research and Development Program of China [2016YFB0301303]
- National Natural Science Foundation of China [51504023, U1602271]
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Effect of Ag addition on the microstructure and mechanical properties of as-cast, cold-rolled and aging treated Cu-Cr alloys were investigated in this study. The results indicated that adding a small amount of Ag significantly improve the mechanical properties of the Cu-Cr alloys with little effect on electrical conductivity. Besides the solution strengthening mechanism of Ag, the distribution changes of Cr precipitates from the chain along grain and dendritic boundaries to homogeneously dispersed sphere in the as-cast Cu-Cr-Ag alloys, and more fibrous Cr precipitates obtained in the cold-rolled Cu-Cr-Ag alloys also played key roles in the performance improvement of the alloys. By intermediate frequency induction melting with non-vacuum melting condition, 1000 degrees C - 60 min solution treatment, 95% cold-rolling deformation, and 400 degrees C - 90 min aging treatment, the Cu-0.89Cr-0.44Ag alloy exhibited excellent mechanical-electrical properties with the tensile strength of 541.5 MPa and electrical conductivity of 83.2%IACS. Meanwhile, the Cu-0.94Cr-0.11Ag alloy showed a better cost performance (tensile strength.conductivity/raw material price per kg) about 800 MPa.%IACS/Yuan. These relevant results provided important references for research and development of the high-performance Cu-Cr-Ag alloy.
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