Effect of trace Ni element addition on precipitation behavior and properties of Cu-Cr alloy

doi:10.13251/j.issn.0254-6051.2023.07.009

Abstract

Abstract: Cu-Cr and Cu-Cr-Ni alloys were prepared by vacuum melting in argon atmosphere, followed by solid solution at 950 ℃ for 1 h and aging at 450 ℃. The properties and microstructure of the two alloys were analyzed and characterized by means of Vickers hardness tester, DC digital resistance tester, metallographic microscope and transmission electron microscope (TEM). The results show that the hardness of the Cu-Cr-Ni alloy reaches the peak value of 124.6 HV0.5 after aging at 450 ℃ for 8 h, and the conductivity is 83.2%IACS, while the hardness of the Cu-Cr alloy reaches the peak value of 116.7 HV0.5 after aging at 450 ℃ for 1 h, which indicates that the addition of Ni increases the hardness of the Cu-Cr alloy and maintains a high conductivity. At the beginning of aging (1 h), bcc-Cr phase is observed in the Cu-Cr-Ni alloy, which indicates that the addition of Ni accelerates the precipitation rate of precipitates, and promotes the transformation of precipitates from fcc-Cr structure to bcc-Cr structure. In addition, the Cr precipitates of the Cu-Cr-Ni alloy still maintain a semi-coherent relationship with the matrix after aging for 12 h.

Key words: Cu-Cr-Ni alloy, precipitates, hardness, electrical conductivity

CLC Number:

TG146.1

Wu Fan, Gong Qinghua, Xie Weibin, Wu Yu, Chen Huiming, Wang Hang. Effect of trace Ni element addition on precipitation behavior and properties of Cu-Cr alloy[J]. Heat Treatment of Metals, 2023, 48(7): 49-53.

References

[1]Shangina D V, Bochvar N R, Morozova A I, et al. Effect of chromium and zirconium content on structure, strength and electrical conductivity of Cu-Cr-Zr alloys after high pressure torsion[J]. Materials Letters, 2017, 199: 46-49.
[2]Zhang S J, Li R G, Kang H J, et al. A high strength and high electrical conductivity Cu-Cr-Zr alloy fabricated by cryorolling and intermediate aging treatment[J]. Materials Science and Engineering A, 2016, 680: 108-114.
[3]Islamgaliev R K, Nesterov K M, Bourgon J, et al. Nanostructured Cu-Cr alloy with high strength and electrical conductivity[J]. Journal of Applied Physics, 2014, 115(19): 194301.
[4]Fu H D, Xu S, Li W, et al. Effect of rolling and aging processes on microstructure and properties of Cu-Cr-Zr alloy[J]. Materials Science and Engineering A, 2017, 700: 107-115.
[5]丰振军, 杜忠泽, 王庆娟. 高强高导 Cu-Cr-Zr系合金的研究进展[J]. 热加工工艺, 2008, 37(8): 86-89.
Feng Zhenjun, Du Zhongze, Wang Qingjuan. Research progress of high-strength and high-conductivity Cu-Cr-Zr system alloy[J]. Hot Working Technology, 2008, 37(8): 86-89.
[6]占国星, 李明茂. 高强高导Cu-Cr-Zr系合金的研究与应用进展[J]. 有色金属科学与工程, 2012, 3(1): 13-17.
Zhan Guoxing, Li Mingmao. Research and application progress of high-strength and high-conductivity Cu-Cr-Zr alloys[J]. Nonferrous Metals Science and Engineering, 2012, 3(1): 13-17.
[7]Chbihi A, Sauvage X, Blavette D. Atomic scale investigation of Cr precipitation in copper[J]. Acta Materialia, 2012, 60(11): 4575-4585.
[8]Jin Y, Adachi K, Takeuchi T, et al. Correlation between the electrical conductivity and aging treatment for a Cu-15wt%Cr alloy composite formed in-situ[J]. Materials Letters, 2005, 32(2): 371-374.
[9]Peng L J, Xie H F, Huang G J, et al. The phase transformation and strengthening of a Cu-0.71wt%Cr alloy[J]. Journal of Alloys and Compounds, 2017, 708: 1096-1102.
[10]Hatakeyama M, Toyama T, Nagai Y, et al. Nanostructuralevolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe[J]. Materials Transactions, 2008, 49(3): 518-521.
[11]Zhang P C, Jie J C, Gao Y, et al. Influence of cold deformation and Ti element on the microstructure and properties of Cu-Cr system alloys[J]. Journal of Materials Research, 2015, 30(13): 2073-2080.
[12]Xu S, Fu H D, Wang Y G, et al. Effect of Ag addition on the microstructure and mechanical properties of Cu-Cr alloy[J]. Materials Science and Engineering A, 2018, 726: 208-214.
[13]Zeng H, Sui H, Wu S J, et al. Evolution of the microstructure and properties of a Cu-Cr-(Mg)alloy upon thermomechanical treatment[J]. Journal of Alloys and Compounds, 2020, 857: 157582.
[14]Ma M Z, Xiao Z, Meng X P, et al. Effects of trace calcium and strontium on microstructure and properties of Cu-Cr alloys[J]. Journal of Materials Science and Technology, 2022, 112(17): 11-23.
[15]罗泽宇. Cu-Cr-Sn合金成分、工艺、组织与性能之间构效关系研究[D]. 赣州: 江西理工大学, 2019.
Luo Zeyu. Study on structure-activity relationship among composition, process, microstructure and properties of Cu-Cr-Sn alloy[D]. Ganzhou: Jiangxi University of Science and Technology, 2019.
[16]Wang X Y, Xie W B, Chen H M, et al. First-principles study of phase transformations in Cu-Cr alloys[J]. Journal of Alloys and Compounds, 2021, 862: 158531.
[17]Ardell A J. Precipitation hardening[J]. Metallurgical Transactions A, 1942, 16(12): 2131-2165.
[18]Fujii T, Nakazawa H, Kato M, et al. Crystallography and morphology of nanosized Cr particles in a Cu-0.2%Cr alloy[J]. Acta Materialia, 2000, 48(5): 1033-1045.