Effect of rolling and aging processes on microstructure and properties of Cu-Cr-Zr alloy

Fu, Huadong; Xu, Sheng; Li, Wei; Xie, Jun; Zhao, Hongbin; Pan, Zhijun

doi:10.1016/j.msea.2017.05.114

Cited by 156 publications

(35 citation statements)

References 24 publications

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“…For instance, the deformed Cu-Cr-based alloys exhibit improved strength, wear resistance and fatigue strength; high electrical and thermal conductivity; good thermal stability at high temperatures; and resistance to corrosion [2,[23][24][25][26]. The Cu-Cr-based alloys are valuable non-ferrous materials with several applications, such as in integrated circuit lead frames [27,28], high-current connectors [29][30][31], railway contact wires, electrodes for spot welding [4] and switching devices [32].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

et al. 2020

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A Cu–1.1%Cr–0.04%Zr (wt.%) alloy was processed by severe plastic deformation (SPD) using the equal channel angular pressing (ECAP) technique at room temperature (RT). It was found that when the number of passes increased from one to four, the dislocation density significantly increased by 35% while the crystallite size decreased by 32%. Subsequent rolling at RT did not influence considerably the crystallite size and dislocation density. At the same time, cryorolling at liquid nitrogen temperature yielded a much higher dislocation density. All the samples contained Cr particles with an average size of 1 µm. Both the size and fraction of the Cr particles did not change during the increase in ECAP passes and the application of rolling after ECAP. The hardness of the severely deformed Cu alloy samples can be well correlated to the dislocation density using the Taylor equation. Heat treatment at 430 °C for 30 min in air caused a significant reduction in the dislocation density for all the deformed samples, while the hardness considerably increased. This apparent contradiction can be explained by the solute oxygen hardening, but the annihilation of mobile dislocations during annealing may also contribute to hardening.

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Section: Introductionmentioning

confidence: 99%

The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

et al. 2020

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“…The diffraction peaks of elements such as Sn, La, Cr, S, and Na disappear, and it is presumed that these elements diffuse into the matrix to form solid solution or compound. In addition, XRD results show that Zn element is solid-dissolved into the Cu matrix to form Cu 3 Zn solid solution, because high temperature and high pressure conditions provide sufficient power for atomic diffusion [50,51]. The TiH 2 in the matrix will decompose under high temperature, and the Ti atoms generated after the decomposition will react with ZTA and the matrix to form TiO and Cu 3 Ti 3 O.…”

Section: Microstructure and Phase Of Cu-zta Cermetmentioning

confidence: 99%

Microstructure and mechanical properties of Cu-ZTA cermet prepared by vacuum hot pressing sintering

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Jiang

Sun

et al. 2020

Mater. Res. Express

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In this paper, seven copper-zirconia toughened alumina (Cu-ZTA) cermets were prepared by vacuum hot pressing sintering (VHP). The effects of different binder content and different particle size of ZTA particles on the mechanical properties of Cu-ZTA cermets were investigated. The microstructure of the composites was studied by x-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The hardness of the material was measured by micro Vickers hardness tester. The results show that the solid solution strengthening occurs in the hot pressing sintering process, the formation of copper-based solid solution increases the hardness of the matrix, the highest is192.04 HV 0.1 . The ZTA particles are uniformly distributed in the matrix, and the surface of the ZTA particles is surrounded by a continuous coppermatrix and second phase. Two interfaces are formed between ZTA particles and Cu matrix. One is the ZTA/Cu interface formed by the substitution of Cu atoms for Ni atoms, it is a mechanical meshing interface which extends the service life of cermet under mechanical stress and thermal stress. The other interface is the reaction bonding interface of Cu 3 Ti 3 O and TiO x . The friction and wear test results show that the use of low-diameter ZTA particles and increasing the content of Cu binder will improve the friction and wear properties of Cu-ZTAcermet. Under the action of stress, the fracture occurs at the interface of Cu/ZTA, and the wear, fracture and extraction of ZTA ceramics cause the failure of Cu-ZTA cermet.

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“…6 show that the dislocation density of the deformed Cu-Cr-In alloy decreases with an increase in annealing temperature and an extension of annealing time. To quantify the dislocation density of the corresponding annealed Cu-Cr-In alloys, the Williamson-Hall model and the following equation were used[16]:…”

mentioning

confidence: 90%

“…Cu-Cr-based alloys are a traditional age-hardening alloy, and are used widely in the fields of contact wires, lead frames and heat exchange because of a good combination of strength properties, electrical conductivity and ductility [1,2]. Alloying element addition [3][4][5], processing, and heat treatment [6][7][8] are major routes to improve performance. Annealing at a specific temperature for precipitation nucleation is an important process to improve the performance, and it is accompanied by a growth of precipitation phases and alloy recovery and recrystallization [9].…”

Section: Introductionmentioning

confidence: 99%

Study on the Softening Behavior of Cu–Cr–In Alloy during Annealing

et al. 2020

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The softening behavior of a cold-drawn Cu–Cr–In alloy was investigated during annealing between 450 °C and 700 °C. The properties and microstructure evolution of the alloy were characterized using a microhardness tester, electron back-scatter diffraction, and transmission electron microscopy. Elemental In addition was found to hinder the dislocation movement and delay the recovery and recrystallization of the Cu–Cr–In alloy. The experimental data were analyzed using the Johnson–Mehlv–Avramiv–Kolmogorov model. The activation energy of recrystallization of the 60% cold-drawn Cu0.54Cr0.17In alloy was 188.29 ± 18.44 kJ/mol, and the recrystallization mechanism of the alloy was attributed mainly to Cu self-diffusion.

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Effect of rolling and aging processes on microstructure and properties of Cu-Cr-Zr alloy

Cited by 156 publications

References 24 publications

The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

Microstructure and mechanical properties of Cu-ZTA cermet prepared by vacuum hot pressing sintering

Study on the Softening Behavior of Cu–Cr–In Alloy during Annealing

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