In-situ TEM study of the dynamic interactions between dislocations and precipitates in a Cu-Cr-Zr alloy

Liu, Jiabin; Hou, Menglian; Yang, Hanyu; Xie, Hongbin; Yang, Chao; Zhang, Jindong; Feng, Quanlong; Wang, Litian; Meng, Liang; Wang, Hongtao

doi:10.1016/j.jallcom.2018.06.158

Cited by 55 publications

(20 citation statements)

References 30 publications

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“…[123][124][125]158,159] The possible applications could include but are not limited to: in situ studies of nucleation-growth-coarsening, [158][159][160][161][162] precipitate impingement, [163] precipitate splitting (reverse coarsening), [164] precipitation under irradiation, [165] structural transformation of precipitates during heat treatment or deformation, [95] and precipitate-dislocation interaction. [10,166,167] All these fields are promising but still in their rudimentary stages. In situ TEM sample holders that perform heating have been in development and in use for many decades.…”

Section: In Situ Methodsmentioning

confidence: 99%

On the role of transmission electron microscopy for precipitation analysis in metallic materials

Zhou

Babu

Hou

et al. 2021

Critical Reviews in Solid State and Materials Sciences

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Precipitation hardening is one of the most important strengthening mechanisms in metallic materials, and thus, controlling precipitation is often critical in optimizing mechanical performance. Also other performance requirements such as functional and degradation properties are critically depending on precipitation. Control of precipitation in metallic materials is, thus, vital, and the approach presently in the limelight for this purpose is an integrated approach of theory, computations and experimental characterization. An empirical understanding is essential to build physical models upon and, furthermore, quantitative experimental data is needed to build databases and to calibrate the models. The most versatile tool for precipitation characterization is the transmission electron microscope (TEM). The TEM has sufficient resolving power to image even the finest precipitates, and with TEMbased microanalysis, overall quantitative data such as particle size distribution, volume fraction and number density of particles can be gathered. Moreover, details of precipitate structure, morphology and chemistry, can be revealed. TEM-based postmortem and in situ analysis of precipitation has made significant progress over the last decade, largely stimulated by the widespread application of aberration corrected microscopes and accompanying novel analytics. The purpose of this report is to review these recent developments in precipitation analysis methodology, including sample preparation. Application examples are provided for precipitation analysis in metals, and future prospects are discussed.

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Section: In Situ Methodsmentioning

confidence: 99%

On the role of transmission electron microscopy for precipitation analysis in metallic materials

Zhou

Babu

Hou

et al. 2021

Critical Reviews in Solid State and Materials Sciences

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“…They found that the hardness and electrical conductivity of the alloy could reach 170 HV and 66%IACS, respectively, after 80% cold rolling and aging for 16 h at 300°C ( Figure 3). Liu et al [32] prepared the Cu-0.55 Cr-0.05 Zr (wt.%) alloy by solid solution, rolling and aging treatments. The results showed that the peak hardness of 131 HV was achieved after aging at 500°C for 1 h, corresponding to an electrical conductivity of 85.3%IACS ( Figure 4).…”

Section: Research Progresses In Hshc Cu Alloys 31 Cu-cr-zr Systemmentioning

confidence: 99%

“…(a) Micro-hardness and (b) electrical conductivity of the Cu-0.55 Cr-0.05Zr (wt.%) isochronally aged for 1 h at various temperatures[32].…”

mentioning

confidence: 99%

High strength and high conductivity Cu alloys: A review

Yang

Lei

et al. 2020

Sci. China Technol. Sci.

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High strength and high conductivity (HSHC) Cu alloys are widely used in many fields, such as high-speed electric railway contact wires and integrated circuit lead frames. Pure Cu is well known to have excellent electrical conductivity but rather low strength. The main concern of HSHC Cu alloys is how to strengthen the alloy efficiently. However, when the Cu alloys are strengthened by a certain method, their electrical conductivity will inevitably decrease to a certain extent. This review introduces the strengthening methods of HSHC Cu alloys. Then the research progress of some typical HSHC Cu alloys such as Cu-Cr-Zr, Cu-Ni-Si, Cu-Ag, Cu-Mg is reviewed according to different alloy systems. Finally, the development trend of HSHC Cu alloys is forecasted. It is pointed out that precipitation and micro-alloying are effective ways to improve the performance of HSHC Cu alloys. At the same time, the production of HSHC Cu alloys also needs to comply with the large-scale, low-cost development trend of industrialization in the future.

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“…Then, the cathode spot moves to surrounding area randomly, and the motion direction of spots will change or jump when spots is hindered by the secondary phases (due to their high hardness and Arc Breakdown times/ number weakened in this process. However, the secondary phase can cause lattice distortion [29] of matrix, and the electron will be emitted due to the larger energy of distortion. In addition, the spots are constantly scattered until extinguished.…”

Section: Investigation On Mechanism Of Arc Erosionmentioning

confidence: 99%

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

Zhou

Chen

Feng

et al. 2020

Journal of Alloys and Compounds

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Zr alloys are often subjected to premature failures due to arc erosion at moment of their breakdown. In this paper, a series of simulated high-voltage arc ablation experiments were conducted to systematically investigate arc ablation characteristics of Cu-Cr-Zr alloys, their microstructure evolutions and anti-ablation properties after plastic deformation and microalloying. Results showed that during their arc ablation processes, a halo pattern was firstly formed on the surface under the action of high-temperature arc. This is followed by partial melting and splashing of Cu, forming of uneven and rough surfaces, and finally significant burning of the alloy. The degree of ablation of alloy is aggravated with the increased breakdown voltage. Due to a combined effect of solid solution strengthening, fine grain strengthening and deformation strengthening, the ablation resistance of the micro-alloyed and plastically deformed alloy has been significantly improved. The breakdown field strengths of commercial Cu-Cr-Zr alloy, heat-treated and deformed one, micro-alloyed and heat-treated one are 1.46×10 6 V/m, 1.67×10 6 V/m and 1.90×10 6 V/m, respectively. However, the breakdown strength of alloys after microalloying is unstable. Results show that there are no preferred phases formed after the first breakdown of arc ablation of Cu-Cr-Zr alloys. The second-phase particles with high-hardness and high-melting temperature hinder the splashing and flow of the molten copper, and inhibit the movement of the cathode spots during the ablation process.

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In-situ TEM study of the dynamic interactions between dislocations and precipitates in a Cu-Cr-Zr alloy

Cited by 55 publications

References 30 publications

On the role of transmission electron microscopy for precipitation analysis in metallic materials

On the role of transmission electron microscopy for precipitation analysis in metallic materials

High strength and high conductivity Cu alloys: A review

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

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