Effects of Mn content and annealing process on microstructure and properties of Cu-xMn-0.2Ce-0.2Zr alloys

doi:10.13251/j.issn.0254-6051.2023.06.039

Abstract

Abstract: Effects of Mn content and annealing process on microstructure and properties of cold-rolled Cu-xMn-0.2Ce-0.2Zr (x=5, 6, 7, 8) alloys were studied by microstructure observation, X-ray diffraction analysis, and measurements of resistivity and temperature coefficient of resistance, micro Vickers hardness and Tafel polarization curves. The results show that with the increase of Mn content, the resistivity gradually increases, the temperature coefficient of resistance gradually decreases, and the preferential orientation of the alloy is (220)_Cu crystal plane. After annealing at 250, 350, 450 and 550 ℃, the alloy recovers and recrystallizes, so that the internal stress is reduced, and the micro Vickers hardness decreases with the increase of annealing temperature and the extension of holding time. When the Mn content is 7%, the alloy gets good comprehensive properties. After annealing at 350 ℃ for 1 h and water cooling, the resistivity is 22.3 μΩ·cm, and the temperature coefficient of resistance (TCR_{25-125 ℃}) is 116×10^-6/℃. The self corrosion potential and self corrosion current density are -0.172 V and 1.86 μA/cm², respectively, indicating that the Cu-7Mn-0.2Ce-0.2Zr alloy has excellent electrical properties in the working temperature range, and also has good corrosion resistance.

Key words: Cu-Mn alloy, annealing process, Mn content, resistivity, temperature coefficient of resistance, Tafel polarization curve, microstructure, hardness

CLC Number:

TG146.1

Xu Liangliang, Tan Dunqiang. Effects of Mn content and annealing process on microstructure and properties of Cu-xMn-0.2Ce-0.2Zr alloys[J]. Heat Treatment of Metals, 2023, 48(6): 219-228.

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