Precipitation in a Cu–Cr–Zr–Mg alloy during aging

Cheng, Jian; Shen, B. G.; Yu, Fang

doi:10.1016/j.matchar.2013.04.008

Cited by 87 publications

(36 citation statements)

References 30 publications

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“…Diffraction spots from the precipitated particles are shown in Figure 4c,d, which indicates that the discontinuous precipitates are fcc Cr-rich phases with a cube-on-cube OR (designated as β (I)). The result is also in accordance with previous studies on Cu-Cr-Zr alloys [17,[21][22][23]. The precipitate lattice parameter is calculated to be about 0.4180 nm.…”

Section: Methodssupporting

confidence: 91%

“…Using multi-angle electron diffraction, Batra et al [21] proved the existence of a transition fcc structure Cr-rich phase with a cube-on-cube OR during the early aging stage. This kind of fcc structure was also observed by Xia et al [22] and Chen et al [23]. Moreover, other precipitation phases have also been observed, like Cu 4 Zr [16] or Cu 51 Zr 14 [24], and some Zr and Fe segregations along Cu/Cr interfaces [25] have also been reported.…”

Section: Introductionsupporting

confidence: 72%

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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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Section: Methodssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 72%

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

Chen

Jiang

et al. 2018

Metals

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“…As can be understood from the schematic figure in Fig. 7d In Cu-Cr alloys, the OR between Cr precipitates with BCC structure and the Cu matrix changed from cube-on-cube to NW OR, and finally to KS OR during aging [12,17,18]. Similarly, in Cu-Fe alloys, we found that the OR between Fe precipitates and the Cu matrix changed from Pitsch OR to KS OR.…”

Section: Contents Lists Available At Sciencedirectsupporting

confidence: 55%

Diffraction analysis of α-Fe precipitates in a polycrystalline Cu–Fe alloy

Dong

Wang

Shen

et al. 2015

Materials Characterization

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“…For instance, copper-0.6 % chromium-0.15 % zirconium-0.05 % magnesium alloy have been prepared, it showed that excellent hardness (210 HV 0.025) and conductivity (76 % IACS) were achieved after 40 % cold rolling and aging at 500°C for 1 h [10]. The copper-0.69 % chromium-0.10 % zirconium-0.02 % magnesium alloy have been processed by hot-rolling (50 %) at 960°C for 2 h solid solution and 450°C for 8 h, it showed that the hardness of 120 HV 1 and electrical conductivity of 85 % IACS were obtained [11]. The copper-0.39 %chromium-0.24 % zirconium-0.072 % magnesium-0.021 % silicon alloy have been fabricated and after 83 % hot rolling, 80 % cold rolling and 0.5 h aging at 450°C, the hardness and conductivity reached up to 189 HV 2.5 and 75 % IACS, respectively [12].…”

Section: Introductionmentioning

confidence: 97%

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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Precipitation in a Cu–Cr–Zr–Mg alloy during aging

Cited by 87 publications

References 30 publications

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

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

Diffraction analysis of α-Fe precipitates in a polycrystalline Cu–Fe alloy

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

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