Study on High Temperature Properties of CuCrAg Alloy

Abstract:

In this paper, nominal composition of Cu-0.3Cr-0.07Ag (at%) was designed. The high temperature properties and microstructure were investigated by Transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results show that the tensile strength of CuCrAg decreases as temperature rises, which was associated with the coarsen precipitates according to TEM observation. Furthermore, observations of fracture morphology reveal that the mechanism transforms into brittle fracture from ductile fracture at elevated temperature. Creep curves were found to vary as a function of applied stress and temperature, the stress exponent values are 8.7, 4.6, 4.3 at 673K, 773K, 873K respectively. The mechanism is dislocation climbing at 773K and 873K while creep behavior at 673K could be explained by the invariant substructure model.

• Periodical: Materials Science Forum (Volume 921)
• Pages: 141-146
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.921.141
• Online since: May 2018
• Authors: Zong Wu Li, Hao Feng Xie*, Guo Jie Huang, Xue Feng, Lijun Peng, Zhen Yang, Xu Jun Mi, Xiang Qian Yin
• Keywords: Creep Mechanism, CuCrAg Alloy, High Temperature Performance, Microstructure

References

[1] Wang Y, Tang B H, Li F Y. The properties of self-formed diffusion barrier layer in Cu(Cr) alloy[J]. Vacuum, 2016, 126:51-54.

DOI: 10.1016/j.vacuum.2016.01.019

[2] Mishnev R, Shakhova I, Belyakov A, et al. Deformation microstructures, strengthening mechanisms, and electrical conductivity in a Cu–Cr–Zr alloy[J]. Materials Science & Engineering A, 2015, 629:29-40.

DOI: 10.1016/j.msea.2015.01.065

[3] Shakhova I, Yanushkevich Z, Fedorova I, et al. Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging[J]. Materials Science & Engineering A, 2014, 606:380-389.

DOI: 10.1016/j.msea.2014.03.116

[4] Pan Z Y, Chen J B, Jin-Fu L I. Microstructure and properties of rare earth-containing Cu–Cr–Zr alloy[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(4):1206-1214.

DOI: 10.1016/s1003-6326(15)63717-7

[5] Yu R P, Mi X J, Xie H F, et al. Research on microstructure and properties of Cu-Cr-Zr-Zn Alloy[J]. Applied Mechanics & Materials, 2013, 278-280:474-478.

DOI: 10.4028/www.scientific.net/amm.278-280.474

[6] Wang W, Kang H, Chen Z, et al. Effects of Cr and Zr additions on microstructure and properties of Cu-Ni-Si alloys[J]. Materials Science & Engineering A, 2016, 673:378-390.

DOI: 10.1016/j.msea.2016.07.021

[7] Yong P, Xia C D, Wang M P, Zhou L, et al. Effects of Zr and (Ni, Si) additions on properties and microstructure of Cu-Cr alloys[J]. Journal of Alloys and Compounds, 2014, 582:786-792.

DOI: 10.1016/j.jallcom.2013.08.146

[8] Wang S, Xie M, Wang S B, et al. Microstructure and Properties of Aged High Strength and High Conductivity Cu-Ag-Cr Alloy [J]. Rare Metals, 2014, 38(2):210-215.

[9] Song L P, Sun W, Yin Z M. Effect of Ag and Zr on microstructure and properties of Cu-Ag-Zr Alloy[J]. Heat Treatment of Metals, 2006, 31(8):46-48.

[10] Zhang C, Ding Z B, Xu Y S. Study on high temperature creep property of Cu-0.2Zr and Cu-3Ag-0.5Zr alloys[J]. Materials for Mechanical Engineering, 2011, 35(12):38-43.

[11] The effect of silver content on tensile strength and electrical conductivity of CuAg alloy contact wire bank[J]. YUNNAN METALLURGY, 2016, 45(4):62-65.

[12] Abib K, Azzeddine H, Tirsatine K, et al. Thermal stability of Cu-Cr-Zr alloy processed by equal-channel angular pressing[J]. Materials Characterization, 2016, 118:527-534.

DOI: 10.1016/j.matchar.2016.07.006

[13] Zhang C. Study on high temperature tensile properties of Cu-Zr and Cu-Ag-Zr[J]. China Technology, 2014(13):276-276.

[14] Chatterjee A, Mitra R, Chakraborty A K, et al. Comparative study of approaches to assess damage in thermally fatigued Cu-Cr-Zr alloy[J]. Journal of Nuclear Materials, 2016, 474:120-125.

DOI: 10.1016/j.jnucmat.2016.03.011

[15] Pond R C, Clark W A T, King A H, et al. Boundaries and interfaces in materials: The David A. Smith symposium[C]// Materials Week 97, Indianapolis, IN (United States), 14-18 Sep 1997. (1998).

[16] Krishna S C, Rao G S, Jha A K, et al. Strengthening in high strength Cu-Cr-Zr-Ti alloy plates produced by hot rolling[J]. Materials Science & Engineering A, 2016, 674:164-170.

DOI: 10.1016/j.msea.2016.07.063

[17] Hu G X, Cai X, Rong Y H. Fundamentals of Materials Science[M]. Shanghai: Shanghai Jiaotong University Press, 2009:218.

[18] Guo J T, Yuan C, Hou J S. Creep and fatigue - creep - environment interaction rules and mechanism of superalloys [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(3):487-504.

[19] Feng D. Metal Physics[M]. Beijing:Science Press, 1999:565-568.