Liquid phase separation of Cu–Cr alloys during the vacuum breakdown

Wei, Xin; Wang, Jiping; Yang, Zhimao; Sun, Zhanbo; Yu, Demei; Song, Xiaoping; Ding, Bingjun; Yang, Sen

doi:10.1016/j.jallcom.2011.04.017

Cited by 46 publications

(24 citation statements)

References 26 publications

(57 reference statements)

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“…The cooling rate of the alloy droplets is lower than that of the melts in the pool, and the liquid phase separation and the liquid flow proceed simultaneously. In accordance with previously reported results 2,19 , small Cr-rich droplets form in Cu-Cr remelting layer continuously and some extremely fine Cr-rich particles always appear during the liquid phase separation process. Figure 5 shows a schematic illustration of the HCPEB-treated Cu-Cr alloy in this experiment.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

Microstructure and Liquid Phase Separation of CuCr Alloys Treated by High Current Pulsed Electron Beam

Zhou

Chai

et al. 2015

Mat. Res.

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Section: Discussionsupporting

confidence: 93%

“…As shown in Figure 5c, the craters and remelting layer occur when the switch is turned off. This refinement of Cr particles can remarkably improve the dielectric strength according to previous reports 19 . The appearance of Cr-rich spheroids is beneficial to the improvement of the dielectric strength of the Cu-Cr contact materials.…”

Section: Discussionsupporting

confidence: 73%

Microstructure and Liquid Phase Separation of CuCr Alloys Treated by High Current Pulsed Electron Beam

Zhou

Chai

et al. 2015

Mat. Res.

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“…In the past few years, various research papers have been published regarding the metastable liquid-liquid phase separation when the liquid separation can be achieved only by undercooling the liquid. This phenomenon is the case for some Cu-based alloy [2][3]. Amorphous/amorphous or amorphous/crystalline composites can be obtained owing to liquid separation depending on the glass forming ability of the immiscible liquids [4][5].…”

Section: Introductionmentioning

confidence: 91%

Liquid separation in Cu–Zr–Ag ternary alloys

Janovszky

Tomolya

Sycheva

et al. 2014

Journal of Alloys and Compounds

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While cooling beyond a certain temperature limit (T SEP ) the Cu-Zr-Ag ternary melt of the separated field in the ternary diagram decomposes into an Ag-rich liquid (L 1 ) and another liquid rich in Cu and Zr (L 2 ) both under equilibrium and non-equilibrium conditions. The master alloy samples were melted and cast in a wedge-shaped copper mould, in order to obtain a gradient of cooling rate. The shape of separated melt, its size and distribution were investigated. The boundaries of the liquid ternary miscibility gap have been enlarged owing to high cooling rate. The results confirm that the volume fraction of the separated phases has increased due to higher cooling rate. Three microstructure types can be distinguished during the liquid separation process as a function of L 1 .

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“…There are two phase diagrams of the Cu-Cr alloy system according to previous research [12,13]. Muller et al gave the equilibrium phase diagram of the Cu-Cr alloy system, and considered that it is monotectic with a stable liquid miscibility gap between 40 to 94.5 wt.% Cr.…”

Section: Discussionmentioning

confidence: 99%

“…Muller et al gave the equilibrium phase diagram of the Cu-Cr alloy system, and considered that it is monotectic with a stable liquid miscibility gap between 40 to 94.5 wt.% Cr. Recently, it has been argued that the Cu-Cr system has a metastable liquid miscibility gap from thermodynamic calculations, as replotted in Figure 5 [13]. Before we conducted experiments, the composition of the Cu-Cr alloy was designed according to Muller's equilibrium phase diagram and set to be Cu-50%Cr (in the miscibility gap), Cu-25%Cr (in the middle of the hypereutectic zone), and Cu-4.2%Cr (very close to the eutectic composition).…”

Section: Discussionmentioning

confidence: 99%

Liquid Phase Separation and the Aging Effect on Mechanical and Electrical Properties of Laser Rapidly Solidified Cu100−xCrx Alloys

Zhang

et al. 2015

Metals

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Duplex structure Cu-Cr alloys are widely used as contact materials. They are generally designed by increasing the Cr content for the hardness improvement, which, however, leads to the unfavorable rapid increase of the electrical resistivity. The solidification behavior of Cu 100−x Cr x (x = 4.2, 25 and 50 in wt.%) alloys prepared by laser rapid solidification is studied here, and their hardness and electrical conductivity after aging are measured. The results show that the Cu-4.2%Cr alloy has the most desirable combination of hardness and conductive properties after aging in comparison with Cu-25%Cr and Cu-50%Cr alloys. Very importantly, a 50% improvement in hardness is achieved with a simultaneous 70% reduction in electrical resistivity. The reason is mainly attributed to the liquid phase separation occurring in the Cu-4.2%Cr alloy, which introduces a large amount of well-dispersed sub-micron-scale Cr-rich particulates in the Cu-rich matrix.

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Liquid phase separation of Cu–Cr alloys during the vacuum breakdown

Cited by 46 publications

References 26 publications

Microstructure and Liquid Phase Separation of CuCr Alloys Treated by High Current Pulsed Electron Beam

Microstructure and Liquid Phase Separation of CuCr Alloys Treated by High Current Pulsed Electron Beam

Liquid separation in Cu–Zr–Ag ternary alloys

Liquid Phase Separation and the Aging Effect on Mechanical and Electrical Properties of Laser Rapidly Solidified Cu100−xCrx Alloys

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