The phase transformation and strengthening of a Cu-0.71 wt% Cr alloy

Peng, Lijun; Xie, Haofeng; Huang, Guojie; Xu, Guangchen; Yin, Xiang; Feng, Xue; Mi, Xujun; Yang, Zhen

doi:10.1016/j.jallcom.2017.03.069

Cited by 147 publications

(58 citation statements)

References 28 publications

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“…The copper-chromium binary alloy aging precipitation follows the given sequence: supersaturated solid solution!Guinier Preston region! face-centered cubic chromium phase!ordered face-centered cubic chromium phase!body-centered cubic chromium phase [6]. The results of this paper show that the nano-precipitated phase of copper-chromium alloy is mainly the body-centered cubic structure of chromium and copper-chromium alloy has completed the change of precipitate phase in peak aging state.…”

Section: Discussionmentioning

confidence: 70%

“…Through the composition design and the aging process, excellent mechanical strength can be obtained due to control on nanoprecipitated strengthening phase. In addition, the chromium does not significantly affect the electrical conductivity of copper alloy [4], which encourages the wide exploration of copper-chromium alloys, with low chromium content, for high strength and high conductivity applications [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Magnesium addition in copper‐chromium alloys: The refinement of aging precipitates and improvement on mechanical properties

Wang

Chen

et al. 2019

Materialwissenschaft Werkst

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Herein, we demonstrate the synthesis of copper‐chromium and copper‐ chromium‐magnesium alloys by melting and casting process and explore the effect of the magnesium addition on mechanical and electrical properties of the alloys. This article focuses on the variation of the precipitation sequence and the decrease of strengthening phase sizes induced by the addition of trace magnesium element. The results show that magnesium element has little effect on the hardness of copper‐chromium alloy, but it significantly improves the hardness of the aging alloy and maintains high conductivity. The addition of magnesium element inhibits the growth and structural transformation of the precipitated phase. The refinement impact of magnesium addition on precipitated phase and change in alloy precipitation sequence may be the main reasons for the high hardness of copper‐chromium‐ magnesium alloy. In addition, the magnesium addition shows a significant refinement effect on small size precipitation phase, but it does not present the same refinement effect on large size precipitation phase. This attributes to the presence of a semi‐coherent interface between the matrix and the large size of precipitates, which provides the dislocation‐based diffusion channels for high‐rate chromium diffusion and promotes the precipitate growth.

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Section: Discussionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Magnesium addition in copper‐chromium alloys: The refinement of aging precipitates and improvement on mechanical properties

Wang

Chen

et al. 2019

Materialwissenschaft Werkst

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“…Figure 4b,d suggests that the nanoscaled Cr-rich precipitate phase [11,12] distributes homogeneously in the matrix and the distribution density is basically the same. The fine particles with coffee-bean contrasts [14,15] are ~5 nm after annealing for 60 min. However, Figure 4d shows that the nanoscaled Cr-rich precipitates with an average size of 7 nm present coffee-bean and sphere-like morphologies [14,15] after annealing for 240 min.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

“…The fine particles with coffee-bean contrasts [14,15] are ~5 nm after annealing for 60 min. However, Figure 4d shows that the nanoscaled Cr-rich precipitates with an average size of 7 nm present coffee-bean and sphere-like morphologies [14,15] after annealing for 240 min. Figure 5 shows TEM images of the annealed Cu-Cr-In alloy structure and Cr-rich precipitates at 550 °C for 60 min and 240 min.…”

Section: Microstructure Evolutionmentioning

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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“…Additionally, solid solution and precipitation strengthening are two very powerful approaches for improving the mechanical strength of Cu-based alloys [33]. According to recent studies, it is necessary and sufficient to add appropriate alloying elements such as Cr, Ag, Nb, and Zr into the copper matrix for which the solid solubility decreases with the lowering of the temperature [34,35,36,37]. However, these composites are not useful for high temperatures due to effects of recrystallization, particle coarsening and decomposition of the supersaturated solid solution [38,39].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Microstructure and Mechanical Properties of Copper-Graphite Composites Reinforced with Single-Crystal α-Al2O3 Fibres by Hot Isostatic Pressing

Zhang

Jiang

Qiao³

et al. 2018

Materials

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Single-crystal α-Al2O3 fibres can be utilized as a novel reinforcement in high-temperature composites owing to their high elastic modulus, chemical and thermal stability. Unlike non-oxide fibres and polycrystalline alumina fibres, high-temperature oxidation and polycrystalline particles boundary growth will not occur for single-crystal α-Al2O3 fibres. In this work, single-crystal α-Al2O3 whiskers and Al2O3 particles synergistic reinforced copper-graphite composites were fabricated by mechanical alloying and hot isostatic pressing techniques. The phase compositions, microstructures, and fracture morphologies of the composites were investigated using X-ray diffraction, a scanning electron microscope equipped with an X-ray energy-dispersive spectrometer (EDS), an electron probe microscopic analysis equipped with wavelength-dispersive spectrometer, and a transmission electron microscope equipped with EDS. The mechanical properties have been measured by a micro-hardness tester and electronic universal testing machine. The results show that the reinforcements were unevenly distributed in the matrix with the increase of their content and there were some micro-cracks located at the interface between the reinforcement and the matrix. With the increase of the Al2O3 whisker content, the compressive strength of the composites first increased and then decreased, while the hardness decreased. The fracture and strengthening mechanisms of the composite materials were explored on the basis of the structure and composition of the composites through the formation and function of the interface. The main strengthening mechanism in the composites was fine grain strengthening and solid solution strengthening. The fracture type of the composites was brittle fracture.

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The phase transformation and strengthening of a Cu-0.71 wt% Cr alloy

Cited by 147 publications

References 28 publications

Magnesium addition in copper‐chromium alloys: The refinement of aging precipitates and improvement on mechanical properties

Magnesium addition in copper‐chromium alloys: The refinement of aging precipitates and improvement on mechanical properties

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

Investigation of the Microstructure and Mechanical Properties of Copper-Graphite Composites Reinforced with Single-Crystal α-Al2O3 Fibres by Hot Isostatic Pressing

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