Effect of directional solidification rate on the microstructure and properties of deformation-processed Cu–7Cr–0.1Ag in situ composites

Liu, Keming; Jiang, Zhengyi; Zhao, Jingwei; Zou, Jin; Chen, Zhibao; Lu, Deping

doi:10.1016/j.jallcom.2014.05.181

Cited by 29 publications

(9 citation statements)

References 32 publications

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“…The filament reinforcement phase was not yet completely formed at the beginning of the cold deformation, and the strength was mainly determined by the rule of mixtures. The strengthening was due to the work hardening of the Cu matrix [13,26,35]. For higher strains, the filament reinforcement phase was gradually formed, and the strength was primarily determined by the Hall-Petch relation [8,19,35].…”

Section: Cu-fe In-situ Compositesmentioning

confidence: 99%

“…However, their strength and conductivity are decreased by the substantial solid solubility of Fe atoms in the Cu matrix at high temperatures, and the slow precipitation speed at low temperatures [7,8]. Their properties may be improved by multi-component alloying [8][9][10][11][12][13]. Wang et al [14], Song et al [15], and Xie et al [16] investigated the influence of Ag.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Strengthening Model of Cu–Fe In-Situ Composites

Liu

Sheng

et al. 2020

Materials

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The tensile strength evolution and strengthening mechanism of Cu–Fe in-situ composites were investigated using both experiments and theoretical analysis. Experimentally, the tensile strength evolution of the in-situ composites with a cold deformation strain was studied using the model alloys Cu–11Fe, Cu–14Fe, and Cu–17Fe, and the effect of the strain on the matrix of the in-situ composites was studied using the model alloys Cu–3Fe and Cu–4.3Fe. The tensile strength was related to the microstructure and to the theoretical strengthening mechanisms. Based on these experimental data and theoretical insights, a mathematical model was established for the dependence of the tensile strength on the cold deformation strain. For low cold deformation strains, the strengthening mechanism was mainly work hardening, solid solution, and precipitation strengthening. Tensile strength can be estimated using an improved rule of mixtures. For high cold deformation strains, the strengthening mechanism was mainly filament strengthening. Tensile strength can be estimated using an improved Hall–Petch relation.

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Section: Cu-fe In-situ Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Strengthening Model of Cu–Fe In-Situ Composites

Liu

Sheng

et al. 2020

Materials

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“…The directionally solidified alloy exhibited higher strength than the non-directionally solidified alloy under the same cooling rate 14,15 . Liu et al 16 reported that the tensile strength of the in situ composite from the directionally solidified alloy is significantly higher than that from the as-cast alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of Sn-Bi-Cu ternary eutectic alloy produced by directional solidification

2018

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Sn-36Bi-22Cu (wt.%) ternary eutectic alloy was prepared using vacuum melting furnace and casting furnace. The samples were directionally solidified upwards solidification rate varying from 8.3 to 166 µm/s and at a constant temperature gradient (4.2 K/mm) in a Bridgman-type directional solidification furnace. The composition analysis of the phases and the intermetallics (Cu 3 Sn and Cu 6 Sn 5 ) were determined from EDX and XRD analysis respectively. The variation of the lamellar spacing (Bi-rich phase) and the Cu 3 Sn phase spacing with the solidification rate were investigated. The dependence of microhardness, ultimate compressive strength and compressive yield strength on solidification rate were determined. The spacing and microhardness were measured from both longitudinal and transverse sections of the samples. The dependence of microhardness on the lamellar spacing and the Cu 3 Sn phase spacing were also determined. The relationships between phase spacings, solidification rate and mechanical properties were determined from linear regression analysis.

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“…[1, 27,32] The tensile strength and conductivity of the deformation-processed Cu-14Fe in situ composite with g = 7. …”

Section: Final Combination Of Strength and Conductivitymentioning

confidence: 99%

Thermal Stability and Properties of Deformation-Processed Cu-Fe In Situ Composites

Liu

Jiang

Zhao

et al. 2015

Metall Mater Trans A

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This paper investigated the thermal stability, tensile strength, and conductivity of deformation-processed Cu-14Fe in situ composites produced by thermo-mechanical processing. The thermal stability was analyzed using scanning electronic microscope and transmission electron microscope. The tensile strength and conductivity were evaluated using tensile-testing machine and micro-ohmmeter, respectively. The Fe fibers in the deformation-processed Cu-14Fe in situ composites undergo edge recession, longitudinal splitting, cylinderization, break-up, and spheroidization during the heat treatment. The Cu matrix experiences recovery, recrystallization, and precipitation phase transition. The tensile strength and conductivity first increase with increasing temperature of heat treatment, reach peak values at different temperatures, and then decrease at higher temperatures. The value of parameter Z of the in situ composite reaches the peak of 2.86 x 107 MPa2 pct IACS after isothermal heat treatment at 798 K (525 °C) for 1 hour. The obtained tensile strength and conductivity of the in situ composites are 907 MPa and 54.3 pct IACS; 868 MPa and 55.2 pct IACS; 810 MPa and 55.8 pct IACS; or 745 MPa and 57.4 pct IACS, at η = 7.8 after isochronal heat treatment for 1 hour. This paper investigated the thermal stability, tensile strength, and conductivity of deformationprocessed Cu-14Fe in situ composites produced by thermo-mechanical processing. The thermal stability was analyzed using scanning electronic microscope and transmission electron microscope. The tensile strength and conductivity were evaluated using tensile-testing machine and micro-ohmmeter, respectively. The Fe fibers in the deformation-processed Cu-14Fe in situ composites undergo edge recession, longitudinal splitting, cylinderization, break-up, and spheroidization during the heat treatment. The Cu matrix experiences recovery, recrystallization, and precipitation phase transition. The tensile strength and conductivity first increase with increasing temperature of heat treatment, reach peak values at different temperatures, and then decrease at higher temperatures. The value of parameter Z of the in situ composite reaches the peak of 2.86 9 10 7 MPa 2 pct IACS after isothermal heat treatment at 798 K (525°C) for 1 hour. The obtained tensile strength and conductivity of the in situ composites are 907 MPa and 54.3 pct IACS; 868 MPa and 55.2 pct IACS; 810 MPa and 55.8 pct IACS; or 745 MPa and 57.4 pct IACS, at g = 7.8 after isochronal heat treatment for 1 hour.

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Effect of directional solidification rate on the microstructure and properties of deformation-processed Cu–7Cr–0.1Ag in situ composites

Cited by 29 publications

References 32 publications

Microstructure and Strengthening Model of Cu–Fe In-Situ Composites

Microstructure and Strengthening Model of Cu–Fe In-Situ Composites

Microstructural evolution and mechanical properties of Sn-Bi-Cu ternary eutectic alloy produced by directional solidification

Thermal Stability and Properties of Deformation-Processed Cu-Fe In Situ Composites

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