Aging behavior and precipitates analysis of the Cu–Cr–Zr–Ce alloy

Zhang, Yi; Tran, Hai T.; Chai, Zhe; Liu, Ping; Tian, Baohong; Liu, Yong

doi:10.1016/j.msea.2015.10.046

Cited by 102 publications

(28 citation statements)

References 26 publications

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“…The precipitation nature and sequence in Cu-Cr--Zr alloys after thermomechanical processing have been thoroughly studied [5][6][7][8][9][10][11][12][13][14][15][16]; by contrast, the presence of similar sub-micronic Cr clusters has been reported in only a few studies [12,41,42]. Using energy-dispersive spectroscopy (EDS) mapping, Zhang et al [42] showed that sub-micronic Cr clusters had a coreshell structure with the shell of Zr and the core of Cr.…”

Section: Resultsmentioning

confidence: 99%

“…The high conductivity of these alloys is mainly attributed to the low solubility of Cr and Zr in Cu at room temperature [2], whereas their strength is due to the precipitation of Cr clusters and Cu x Zr y phases in Cu matrices [3,4]. However, many authors have reported antagonist findings of the sequence and nature of precipitates that can appear during annealing after conventional or severe plastic deformation (SPD) of Cu-Cr-Zr alloys [5][6][7][8][9][10][11][12][13][14][15][16]. Besides Cr clusters, different Cu x Zr y phases have been found in Cu-Cr-Zr alloys: orthorhombic Cu 4 Zr phase [10,17] and Cu 51 Zr 14 (believed to be Cu 3 Zr) phase [11].…”

Section: Introductionmentioning

confidence: 99%

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Cr cluster characterization in Cu-Cr-Zr alloy after ECAP processing and aging using SANS and HAADF-STEM

Abib¹,

Azzeddine²,

Alili³

et al. 2020

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The precipitation of nano-sized Cr clusters was investigated in a commercial Cu-1Cr-0.1Zr (wt.%) alloy processed by equal-channel angular pressing and subsequent aging at 550 • C for 4 h using Small-Angle Neutron Scattering (SANS) measurements and High-Angle Annular Dark-Field-Scanning Transmission Electron Microscopy (HAADF-STEM). The size and volume fraction of the nano-sized Cr clusters were estimated using both techniques. The parameter values assessed by SANS (d ∼ 3.2 nm, Fv ∼ 1.1 %) agreed reasonably with those by HAADF-STEM (d ∼ 2.5 nm, Fv ∼ 2.3 %). In addition to the nano-sized Cr clusters, HAADF-STEM indicated the presence of rare cuboid and spheroid sub-micronic Cr particles measuring approximately 380-620 nm in mean size. Both techniques did not evidence the presence of intermetallic CuxZry phases within the aging conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cr cluster characterization in Cu-Cr-Zr alloy after ECAP processing and aging using SANS and HAADF-STEM

Abib¹,

Azzeddine²,

Alili³

et al. 2020

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“…As a typical type of aging hardening alloys, Cu-Cr based alloys have high strength and moderate electrical conductivity, thus they are being applied to contact wires for high speed trains [1][2][3][4], lead frames [5][6][7], heat transfer [1,8], and so on. There are normally two ways to improve the alloy performance-optimization of heat treatment and addition of alloying elements [9][10][11][12]. For the Cu-Cr based alloys, common alloying elements include Zr [1,13,14], Ag [14][15][16], Mg [6,7,13], and Ti [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Solidification microstructure of Cu–Cr and Cu–Cr-In alloys

Zhu¹,

Liao²,

Chen³

et al. 2020

Mater. Res. Express

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Solidification microstructure of Cu-Cr and Cu-Cr-In alloys has been characterized using scanning electron microscopy in the present work. Thermodynamic database has been established for the Cu-Cr binary system and Cu-Cr-In ternary system. Solidification behaviors of the two alloys have been simulated using the thermodynamic parameters based on Scheil model. The results show that the primary Cr phases with long and thin dendrites can be observed between Cu matrix grains for the Cu-Cr alloy, and the 'flower-like' coarsen dendrites primary Cr phases of the Cu-Cr-In alloy exist in the triangular grain boundary areas. The weight percent of indium element in the liquid phase of the Cu-Cr-In alloy during solidification continuously increases up. This will enlarge the solidification temperature range from 6°C to 214°C resulting in longer time for the dendrite growth and the alloying element indium with low melting point tends to segregate to the grain boundary region.

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“…Cu-Cr-Zr might be able to satisfy these requirements. Extensive literature is available on the microstructures, physical properties, and mechanical properties of Cu-Cr-Zr alloys [6][7][8][9][10][11][12][13]. From the literature, cold working and aging treatment are considered to be the two most important materials-processing techniques for Cu-Cr-Zr alloys.…”

Section: Introductionmentioning

confidence: 99%

Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy

Chen

Jiang

et al. 2018

Metals

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In this paper, the precipitation, recrystallization, and evolution of twins in Cu-Cr-Zr alloy strips were investigated. Tensile specimens were aged at three different temperatures for various times so as to bring the strips into every possible aging condition. The results show that the appropriate aging parameter for the 70% reduced cold-rolled alloy strips is 723 K for 240 min, with a tensile strength of 536 MPa and an electrical conductivity of 85.3% International Annealed Copper Standards (IACS) at the peak aged condition. The formation of fcc (face-centered cubic) ordered Cr-rich precipitates (β) is an important factor influencing the significant improvement of properties near the peak aged condition. In terms of crystallographic orientation relationships, there are basically two types of β precipitates in the alloy. Beyond the Cr-rich precipitates (β (I)) formed during the early aging stages, which mimic a cube-on-cube orientation relationship (OR) with the matrix, another Cr-rich precipitate (β (II)) is observed in the peak aged condition. β (II) is coherent with the matrix, with the following ORs: [111] β (II) //[100] Cu , {02-2} β (II) //{02-2} Cu and [011] β (II) //[211] Cu , {200} β (II) //{-111} Cu. These precipitates have a strong dislocation and grain boundary pinning effect, which hinder the dislocation movement and crystal boundary migration, and eventually delay recrystallization and enhance the recrystallization resistance of the peak aged strips. During the subsequent annealing process, the transition phase β gradually loses the coherence mismatch and grows into a larger equilibrium phase of chromium with a bcc (body-centered cubic) structure (β), resulting in the reduction of the pinning effect to dislocations and sub-grains, so that recrystallization occurs. Annealing twins are formed during the recrystallization process to release the deformation energy and to reduce the drive force for interface migration, eventually hindering grain growth.

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Aging behavior and precipitates analysis of the Cu–Cr–Zr–Ce alloy

Cited by 102 publications

References 26 publications

Cr cluster characterization in Cu-Cr-Zr alloy after ECAP processing and aging using SANS and HAADF-STEM

Cr cluster characterization in Cu-Cr-Zr alloy after ECAP processing and aging using SANS and HAADF-STEM

Solidification microstructure of Cu–Cr and Cu–Cr-In alloys

Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy

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