Characterization of the Hot Deformation Behavior of Cu–Cr–Zr Alloy by Processing Maps

Zhang, Yi; Sun, Haoliang; Tian, Baohong; Chai, Zhe; Liu, Ping; Liu, Yong

doi:10.1007/s40195-016-0404-3

Cited by 35 publications

(15 citation statements)

References 27 publications

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“…CuCrZr alloys have attracted much attention because of their high mechanical strength, excellent electrical conductivity, good fatigue property and thermal stability [1][2][3][4][5]. Thus, these alloys have been widely used in many engineering fields.…”

Section: Introductionmentioning

confidence: 99%

Achieving High Strength and High Electrical Conductivity in a CuCrZr Alloy Using Equal-Channel Angular Pressing

Tong

Wang

Qian

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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In the present work, a CuCrZr alloy characterized by ultrafine grains and nanoscale particles was prepared by equalchannel angular pressing (ECAP) at 450°C. A desired combination of a tensile strength (580 MPa) and an electrical conductivity (81% International Annealed Copper Standard) is simultaneously obtained in the as-ECAP-processed CuCrZr alloy without additional aging treatment. The improved properties can be mainly attributed to the ultrafine grains and nanoscale precipitates. This processing may pave a way to develop the CuCrZr alloys having high strength and high electrical conductivity for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Achieving High Strength and High Electrical Conductivity in a CuCrZr Alloy Using Equal-Channel Angular Pressing

Tong

Wang

Qian

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…According to Eqs. (10) and (11), plots of ln _ e À ln sinh ar ð Þ ½ and ln [ sinh (ar)] -1/T were drawn with the experimental data, as shown in Fig. 4.…”

Section: Values Of N and Q Under A Constant Strainmentioning

confidence: 99%

“…Some scholars studied the influence of deformation conditions on the deformation mechanism through calculating the values of stress exponent n and activation energy Q [5]. On microstructure evolution and hot workability during plastic deformation, many scholars adopted processing map based on dynamic material model to study the hot deformation behavior [6][7][8][9][10]. Effects of grain size [11], homogenization [12] and deformation texture [13] on the workability of Mg alloy AZ31 were also investigated by the processing map.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism and Hot Workability of Extruded Magnesium Alloy AZ31

Jin

Yan

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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Using the flow stress curves obtained by Gleeble thermo-mechanical testing, the processing map of extruded magnesium alloy AZ31 was established to analyze the hot workability. Stress exponent and activation energy were calculated to characterize the deformation mechanism. Then, the effects of hot deformation parameters on deformation mechanism, microstructure evolution and hot workability of AZ31 alloy were discussed. With increasing deformation temperature, the operation of non-basal slip systems and full development of dynamic recrystallization (DRX) contribute to effective improvement in hot workability of AZ31 alloy. The influences of strain rate and strain are complex. When temperature exceeds 350°C, the deformation mechanism is slightly dependent of the strain rate or strain. The dominant mechanism is dislocation cross-slip, which favors DRX nucleation and grain growth and thus leads to good plasticity. At low temperature (below 350°C), the deformation mechanism is sensitive to strain and strain rate. Both the dominant deformation mechanism and inadequate development of DRX deteriorate the ductility of AZ31 alloy. The flow instability mainly occurs in the vicinity of 250°C and 1 s -1 .

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“…При этом при динамической рекристаллизации преимущественными центрами зарождения зерен будут тройные стыки [21], в то время как при постдинамической рекристаллизации зародыши будут появляться по границам деформированных зерен [22]. Рекристаллизация в этом случае будет проходить по механизму расщепления высокоугловых границ [23].…”

Section: Introductionunclassified

Structural changes of the Cu-0.6Cr alloy upon cooling at different rates after a large high-temperature deformation

2020

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The present work studies changes in the structure of samples of the Cu-0.6Cr alloy in the state of a supersaturated solid solution, subjected to large plastic deformation by upsetting by 90% (e ≈ 2.0) at a temperature of 800°С and cooling in various environments: liquid nitrogen, water and air, providing different cooling rates of the material. It is shown that the cooling rate has a decisive influence on the type of structure formed. It was found that in the Cu-0.6Cr alloy, a decrease in the cooling rate leads to a decrease in the fraction of high-angle boundaries and to the formation of a finer structure at the meso and micro levels. At the same time, strength and conductivity values grow. At a high cooling rate (liquid nitrogen), the structural state corresponding to the stage of dynamic recrystallization and polygonization is observed. Such a structure has a low dislocation density and more perfect boundaries. When cooling in air at the first stage, post-dynamic recrystallization processes develop, associated with the nucleation of new nuclei of recrystallized grains along the boundaries of deformed grains, as well as the development of a substructure. The average grain and subgrain size decreases to 1.7± 0.2 and 1.1± 0.2 μm, respectively. With further cooling, from a temperature of ≈600°С, two competing processes that develop during aging obviously begin to occur, namely, the recovery of the structure and the decomposition of the solid solution. This is evidenced from a decrease in the lattice parameter and an increase in electrical conductivity (up to 79% IACS), and the close interaction of dispersed particles 5-10 nm in size and dislocations leads to the further development of the substructure. At the same time, the proportion of middle-angle boundaries increases and the proportion of twin boundaries decreases, while the proportion of high-angle boundaries of the general type remains practically unchanged.

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Characterization of the Hot Deformation Behavior of Cu–Cr–Zr Alloy by Processing Maps

Cited by 35 publications

References 27 publications

Achieving High Strength and High Electrical Conductivity in a CuCrZr Alloy Using Equal-Channel Angular Pressing

Achieving High Strength and High Electrical Conductivity in a CuCrZr Alloy Using Equal-Channel Angular Pressing

Deformation Mechanism and Hot Workability of Extruded Magnesium Alloy AZ31

Structural changes of the Cu-0.6Cr alloy upon cooling at different rates after a large high-temperature deformation

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