Precipitation and aging in high-conductivity Cu–Cr alloys with additions of zirconium and magnesium

Tang, N. Y.; Taplin, D. M. R.; Dunlop, G. L.

doi:10.1179/026708385790087235

Cited by 25 publications

(27 citation statements)

References 3 publications

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“…The addition of Mg or Fe has also been proposed by some authors [17,[21][22]. In such more complex alloys, other phases were observed like Cu 4 Zr or CrCu 2 Zr [3,16,22] and some Zr and Fe segregations along Cu/Cr interfaces were also reported [18]. Moreover, the precipitation kinetic of Cr particles seems modified since Batra and co-authors identified only fcc Cr particles with a cube on cube OR and also a metastable ordered phase with a possible B2 structure [20].…”

Section: Introductionmentioning

confidence: 87%

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Atomic scale investigation of Cr precipitation in copper

2012

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The early stage of the chromium precipitation in copper was analyzed at the atomic scale by Atom Probe Tomography (APT). Quantitative data about the precipitate size, 3D shape, density, composition and volume fraction were obtained in a Cu-1Cr-0.1Zr (wt.%) commercial alloy aged at 713K. Surprisingly, nanoscaled precipitates exhibit various shapes (spherical, plates and ellipsoid) and contain a large amount of Cu (up to 50%), in contradiction with the equilibrium Cu-Cr phase diagram. APT data also show that some impurities (Fe) may segregate along Cu/Cr interfaces. The concomitant evolution of the precipitate shape and composition as a function of the aging time is discussed. A special emphasis is given on the competition between interfacial and elastic energy and on the role of Fe segregation.

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Section: Introductionmentioning

confidence: 87%

“…Some authors describe them as GP zones (i.e. few atomic planes) [16], others reporting about spherical [3], ellipsoid [15], plate [5,12], rod shaped precipitates [12,13] or even hexagonal [17]. But very recently, Hatakeyama and co-authors have used Atom Probe Tomography (APT) to analyze such precipitates [18,19].…”

Section: Introductionmentioning

confidence: 99%

Atomic scale investigation of Cr precipitation in copper

2012

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“…The intermetallic compound CrCu 2 (Zr) known as Hesuler phase has a large unit cell containing 8 Cu, 4 Cr and 4 Zr atoms. It will be decomposed into Cr and Zr-rich phases when the aging temperature is above 673 K. Tang et al 5) identified the precipitates in a CuCrZrMg alloy to be Cu 4 Zr and CrCu 2 (Zr, Mg), as has been found by Liu et al 16) at the grain boundary of the rapid solidification structure. Huang and Ma 17) argued that the precipitate of Cu0.31Cr 0.21Zr alloy should be Cu 51 Zr 14 .…”

Section: Introductionmentioning

confidence: 94%

“…Their strength and hardness increase during the initial stage of aging. In recent years, extensive literature has been available on their microstructure, 5,6) precipitation kinetics, 710) physical 11,12) and mechanical 13) properties, but controversies still remain on the phase constitution and strengthening mechanisms. Batra and Qi 14,15) found three phases CrCu 2 (Zr), Cr and Cu 4 Zr in the aged Cu0.8Cr 0.08Zr alloy (weight percent, the same in the following).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Rapidly Solidified Cu–0.81Cr–0.12Zr Alloy

et al. 2013

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Cu0.81 mass%Cr0.12 mass%Zr alloy was spun into ribbon and then aged at different temperatures for different time. The microstructure, microhardness and electrical conductivity were investigated. It is found that the mother alloy ingot solidified under conventional conditions consists of three phases: Cu matrix, Cr and Cu 5 Zr. Rapid quenching makes Cr and Zr fully dissolve into the copper matrix. As the aging proceeds, Cr and Cu 5 Zr phases precipitate again from the matrix. The ribbon aged at 773 K for 15 min possesses the best property: a microhardness of 212 HV and an electrical conductivity of 78.9% IACS. Compared with the conventional process (homogenization treatment of a bulk alloy ingot followed by aging), the use of rapid quenching doubles the microhardness while only slightly decreasing the electrical conductivity.

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“…The morphology, size and distribution of the precipitated Cr phase have a significant influence on the ultimate properties of the Cu-Cr alloy. It has been a topic of great interest of how to control the process of precipitation of Cr phase (Tang et al, 1985). Previous research showed that the Cu-Cr alloy is very sensitive to aging temperature and aging time and easily inclined to overaging under an unsuitable heat treatment program.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF RARE EARTH ELEMENTS ON Cr PRECIPITATIONS IN A Cu-0.8WT%Cr ALLOY

Gewang¹,

Zhang²,

Yan³

2011

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The microstructural evolution of Cu-based alloys during aging was studied using a quantitative metallographic method. Samples were cut from ingots of Cu-0.8wt%Cr and Cu-0.8wt%Cr-RE alloys. These were solution treated at 1000 ºC for 1.5h and subsequently quenched in water, then separately aged at 480 ºC for different durations. The microstructures were observed by optical microscope, and the characteristic geometric parameters of precipitated Cr phase, including volume fraction V V , face density N A , mean diameter and roundness, were measured. These data provided more details about the process of aging. The results showed that precipitation of Cr phase occurred in the form of particles during aging. Rare earth elements promoted the precipitation of Cr phase and dispersed Cr particles. The phenomenon of overaging came earlier in Cu-Cr-RE than in Cu-Cr. In the present work, the optimal aging time at 480 ºC was 2 hrs for the Cu-0.8wt%Cr-RE alloy and 3 hours for the Cu-0.8wt%Cr alloy.

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Precipitation and aging in high-conductivity Cu–Cr alloys with additions of zirconium and magnesium

Cited by 25 publications

References 3 publications

Atomic scale investigation of Cr precipitation in copper

Atomic scale investigation of Cr precipitation in copper

Microstructure and Properties of Rapidly Solidified Cu–0.81Cr–0.12Zr Alloy

THE EFFECT OF RARE EARTH ELEMENTS ON Cr PRECIPITATIONS IN A Cu-0.8WT%Cr ALLOY

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Precipitation and aging in high-conductivity Cu–Cr alloys with additions of zirconium and magnesium

Cited by 25 publications

References 3 publications

Atomic scale investigation of Cr precipitation in copper

Atomic scale investigation of Cr precipitation in copper

Microstructure and Properties of Rapidly Solidified Cu&ndash;0.81Cr&ndash;0.12Zr Alloy

THE EFFECT OF RARE EARTH ELEMENTS ON Cr PRECIPITATIONS IN A Cu-0.8WT%Cr ALLOY

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Microstructure and Properties of Rapidly Solidified Cu–0.81Cr–0.12Zr Alloy