Improving high temperature properties of Cu-Cr-Y alloy by residual Cr particles and nano-Y2O3 dispersions

Zhou, Yirong; Yin, Shengming; Zhou, Qilai; Chen, Zhenglin; Xue, Lihong; Li, Heping; Yan, Yunjun

doi:10.1016/j.jmrt.2022.10.130

Cited by 15 publications

(4 citation statements)

References 36 publications

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“…The focus of this study was thus to find the swaging ratio, which is the most convenient for direct consolidation of the powder of ferritic steel strengthened with yttrium oxide nanoparticles. The yttrium oxide was particularly selected for its advantageous resistance against coarsening and highly efficient grain boundary pinning (also at elevated temperatures) [42]. The following section provides a deeper insight into the hypothesis behind the design of the alloy, as well the details of the used methods, whereas the section on results and discussion deals with detailed investigations of the microstructures consolidated with various swaging ratios.…”

Section: Aim Of the Investigationmentioning

confidence: 99%

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

Kunčická,

Svoboda

2024

Materialwissenschaft Werkst

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Steels strengthened by alloying elements and precipitates typically maintain their enhanced properties up to the ferrite‐austenite transformation. However, oxide dispersion strengthened ferritic steels are creep resistant even at much higher temperatures given by dispersions of nanosized oxides. To ensure homogeneous dispersion of the oxides, powder metallurgy is used for preparation of the original material. The presented study investigates the effects of direct consolidation of powder of ferritic steel strengthened with yttrium oxide nanoparticles. The powders were mechanically alloyed and sealed into evacuated steel containers, which were subjected to gradual hot consolidation via the industrially applicable intensive plastic deformation method of rotary swaging. Investigations assessing the effects of several reduction ratios showed that the direct consolidation of the oxide dispersion strengthened steel was successful – in the macroscale – at the swaging ratio of 1.03; the quality of consolidation further increased with increasing swaging ratio. At the swaging ratio of 1.83, the consolidated bulk material featured ultra‐fine grains characterized with high angle grain boundaries, homogeneous dispersion of oxide precipitates, and the average Vickers microhardness of 706.6 HV 1.

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Section: Aim Of the Investigationmentioning

confidence: 99%

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

Kunčická,

Svoboda

2024

Materialwissenschaft Werkst

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“…Furthermore, the introduction of yttrium oxide (Y 2 O 3 ) nanoparticles and chromium nanoparticles can enhance the high-temperature properties of cooper-chromium (Cu-Cr) alloys [102]. Cu-Cr alloys are important materials for aerospace applications since they combine high strength and thermal conductivity.…”

Section: Thermal Protection Materialsmentioning

confidence: 99%

“…To improve the developments in nanomaterials aerospace applications, microfluidic technology has been mainly focused on three areas: aerodynamic flow control in vehicles, micropower generators (fuel cells and microturbines), and micropropulsion devices [124,125]. Considerable work has also been developed on microfluidic devices for extraterrestrial applications such as advanced environmental control and life-support systems-lab-on-chip systems [102,103]. Examples include microfluidic systems for temperature and humidity control in spacecrafts, trace contaminant monitoring and removal, water quality monitoring, and in vitro physiological monitoring and drug delivery devices [124][125][126][127].…”

Section: Graphene Platelet and Carbon Nanotube With Boron Nitride Nan...mentioning

confidence: 99%

A Review of Novel Heat Transfer Materials and Fluids for Aerospace Applications

Nobrega,

Cardoso,

Souza

et al. 2024

Aerospace

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The issue of thermal control for space missions has been critical since the early space missions in the late 1950s. The demands in such environments are heightened, characterized by significant temperature variations and the need to manage substantial densities of heat. The current work offers a comprehensive survey of the innovative materials and thermal fluids employed in the aerospace technological area. In this scope, the materials should exhibit enhanced reliability for facing maintenance and raw materials scarcity. The improved thermophysical properties of the nanofluids increase the efficiency of the systems, allowing the mass/volume reduction in satellites, rovers, and spacecraft. Herein are summarized the main findings from a literature review of more than one hundred works on aerospace thermal management. In this sense, relevant issues in aerospace convection cooling were reported and discussed, using heat pipes and heat exchangers, and with heat transfer ability at high velocity, low pressure, and microgravity. Among the main findings, it could be highlighted the fact that these novel materials and fluids provide enhanced thermal conductivity, stability, and insulation, enhancing the heat transfer capability and preventing the malfunctioning, overheating, and degradation over time of the systems. The resulting indicators will contribute to strategic mapping knowledge and further competence. Also, this work will identify the main scientific and technological gaps and possible challenges for integrating the materials and fluids into existing systems and for maturation and large-scale feasibility for aerospace valorization and technology transfer enhancement.

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“…In order to meet this serious requirement, enhancing the strength of materials on the basis of ensuring their high electrical conductivity, has become a hot topic of research for Cu-based materials. Up to now, the developed Cu alloys with both high strength and high electrical conductivity have mainly included Cu-Fe-(P), Cu-Ni-Si and Cu-Cr-(Zr) alloys [4][5][6]. Among them, Cu-Ni-Si series alloys are considered to be the most promising candidate for the high-performance integrated circuit, and their excellent comprehensive properties are mainly due to the precipitation of supersaturated Ni and Si atoms as δ-Ni 2 Si (orthogonal structure) in a Cu-rich solid solution [7,8].…”

Section: Introductionmentioning

confidence: 99%

Characterizations on Precipitations in the Cu-Rich Corner of Cu-Ni-Al Ternary Phase Diagram

et al. 2023

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Three kinds of Cu-Ni-Al alloys, whose chemical compositions are located in the Cu-rich corner of the isothermal section of the Cu-Ni-Al ternary phase diagram, were prepared by melting and casting firstly, and then solution and aging treatments were carried out. The microstructure was characterized and the competitive formation process of Ni-Al intermetallics were discussed. The results show that there are little amounts of NiAl phase at the grain boundary and needle- or particle-like Ni3Al phase inside the Cu matrix in all the as-cast alloys, although they are in the single-phase area. Solution and aging treatments mainly result in the disappearance and precipitation of Ni3Al phase, but the precipitations during aging are much smaller than those in the as-cast alloys. Thermodynamics and kinetics calculation indicate that the NiAl intermetallic wins out in the solidification process because of its lower change in Gibbs free energy, while Ni3Al phase is first to precipitate during aging due to its lower formation enthalpy and required Al concentration. The most important contribution of this work is that it proves that intermetallics can precipitate from the so-called single-phase zone in the Cu-rich corner of the Cu-Ni-Al phase diagram, which is the necessary prerequisite for the realization of high strength and high electrical conductivity.

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Improving high temperature properties of Cu-Cr-Y alloy by residual Cr particles and nano-Y2O3 dispersions

Cited by 15 publications

References 36 publications

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

A Review of Novel Heat Transfer Materials and Fluids for Aerospace Applications

Characterizations on Precipitations in the Cu-Rich Corner of Cu-Ni-Al Ternary Phase Diagram

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