Analysis of phases in a Cu–Cr–Zr alloy

Huang, Fuxiang; Ma, Jingling; Hong-long, Ning; Zhang, Geng; Lü, Chao; Guo, Sheng; Xue-tao, YU; Wang, Tao; Hong, Liu; Huafen, Lou

doi:10.1016/s1359-6462(02)00353-6

Cited by 112 publications

(47 citation statements)

References 23 publications

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“…Low-alloy bronzes of the Cu-Cr-Zr system are widely used to create electrically conductive products from which enhanced strength tests are required [1,2]. One of the priority areas of application of these bronzes is the manufacture of contact wires.…”

Section: Introductionmentioning

confidence: 99%

Effect of cold rolling on microstructure and mechanical properties of Cu-0,5%Cr-0,2%Zr subjected to ECAP with various NUNBERS of passes

2017

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Abstract. The paper studies the effect of the combination of ECAP and cold rolling on the structure, mechanical properties and coefficient of friction of low-alloyed bronzes. It is shown that the use of ECAP together with rolling leads to the formation of a UFG structure and an increase in strength characteristics, while the coefficient of friction is increases. Subsequent heat treatment results in additional hardening by the separation of fine particles, which also reduces the coefficient of friction.

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Section: Introductionmentioning

confidence: 99%

Effect of cold rolling on microstructure and mechanical properties of Cu-0,5%Cr-0,2%Zr subjected to ECAP with various NUNBERS of passes

2017

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“…The distribution of secondary phase particles in the Cu-Cr-Zr alloys has been considered in several works [2,12,13,[18][19][20][21][22]. It was assumed [12][13][14]19] that the high electrical conductivity is due to the very low solubility of Cr and Zr in Cu, whereas the excellent strength is attributed to dispersion hardening by the nanoscale precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…It was assumed [12][13][14]19] that the high electrical conductivity is due to the very low solubility of Cr and Zr in Cu, whereas the excellent strength is attributed to dispersion hardening by the nanoscale precipitates. There is no doubt that the strength/conductivity properties of the Cu-Cr-Zr alloys result from precipitation behavior during aging at 723-773 K. The following precipitation sequence for coherent Cr-rich phase particles was revealed in a dilute Cu-Cr alloy [18,23]: (i) Cr-rich fcc spherical precipitates, which can be considered as Guinier-Preston zones; (ii) coherent round/elliptical shaped bcc precipitates of B2-type structure having a Nishiyama-Wassermann orientation relationship with copper matrix and a size of 10 nm or less; (iii) plate/round shaped bcc precipitates having a Kurdjumov-Sachs orientation relationship with copper and a size of $ 10 nm or higher.…”

Section: Introductionmentioning

confidence: 99%

“…At 823-873 K, this phase can decompose into two different phases of Cu 4 Zr and Crrich bcc [13,24]. In addition, coarse precipitates of several Zr-rich phases (Cu 5 Zr) and Cr-rich phases could form at grain boundaries and in grain interiors during solidification of the Cu-Cr-Zr alloys [19]. These particles do not dissolve during solution treatment if the CrþZr content exceeds the equilibrium solubility of Cr and Zr [19].…”

Section: Introductionmentioning

confidence: 99%

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Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

Shakhova

Yanushkevich

Fedorova

et al. 2014

Materials Science and Engineering: A

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a b s t r a c tStructural changes during plastic deformation were studied in a Cu-0.3%Cr-0.5%Zr alloy subjected to multidirectional forging up to a total strain of 4 at the temperatures of 300 K and 673 K. The deformation behavior was characterized by a rapid increase in the flow stress at an early deformation followed by a steady-state flow at large strain. The development of the new ultrafine grains resulted from the progressive increase in the misorientations of the strain-induced low-angle boundaries, which evolve into high-angle boundaries with increasing cumulative strain through a strain-induced continuous reaction that is quite similar to continuous dynamic recrystallization. The formation of ultrafine grains was closely related to the development of geometrically necessary boundaries that is attributed to deformation banding. The grain refinement kinetics increased with an increase in the deformation temperature. At 673 K, the area fractions of the ultrafine grains with a size below 2 μm were 0.36 and 0.6 in the initially solution treated samples and the aged samples, respectively. However, the area fractions of the ultrafine grains did not exceed 0.2 at 300 K.

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“…The high conductivity of the alloy is attributed to the low solubility of Cr and Zr in copper at room temperature [3], while the strength is due to the precipitation of Cr and Cu 5 Zr in copper matrix [4,5]. Zirconium plays an additional role of fixing elemental sulphur and suppresses dynamic embrittlement [6].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

et al. 2012

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In the present investigation, thermal conductivity of Cu-Cr-Zr-Ti alloy was determined as the product of the specific heat (C p ), thermal diffusivity (α), and density (ρ) in the temperature range of 300-873 K. The experimental results showed that the thermal conductivity of the alloy increased with increase in temperature up to 873 K and the data was accurately modeled by a linear equation. For comparison, thermal conductivity was also evaluated for OFHC copper in the same temperature range. The results obtained were discussed using electrical conductivity and hardness measurements made at room temperature. Transmission electron microscopy (TEM) was done to understand the microstructural changes occurring in the sample after the test. Wiedemann-Franz-Lorenz law was employed for calculating electronic and phonon thermal conductivity using electrical conductivity. On the basis of studies conducted it was deduced that in situ aging may be one of the reasons for the increase in thermal conductivity with temperature for Cu-Cr-Zr-Ti alloy.

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Analysis of phases in a Cu–Cr–Zr alloy

Cited by 112 publications

References 23 publications

Effect of cold rolling on microstructure and mechanical properties of Cu-0,5%Cr-0,2%Zr subjected to ECAP with various NUNBERS of passes

Effect of cold rolling on microstructure and mechanical properties of Cu-0,5%Cr-0,2%Zr subjected to ECAP with various NUNBERS of passes

Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

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