Ti-added alumina dispersion-strengthened Cu alloy fabricated by oxidation

Han, Seung Zeon; Joh, Hongrae; Ahn, Jin Ho; Lee, Je-Hyun; Kim, Sang Min; Lim, Sung Hwan; Son, Young Guk

doi:10.1016/j.jallcom.2014.10.031

Cited by 21 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to previously reported copper alloys 31 32 33 34 35 36 37 38 39 40 , our materials show much better performances in simultaneous mechanical strength and electric conductivity. For example, with respect to Cu-Al 32 alloy the two functionalities of our materials have weaker to slightly stronger ultimate tensile strength values (depending on the processing conditions) of 450–584 versus 550–560 MPa, and significantly higher conductivities (90 % versus ~81% IACS) for all conditions for the similar volume fraction ( Fig.…”

Section: Resultsmentioning

confidence: 60%

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Han

Kim

Kang

et al. 2015

Sci Rep

Self Cite

View full text Add to dashboard Cite

The development of Cu-based alloys with high-mechanical properties (strength, ductility) and electrical conductivity plays a key role over a wide range of industrial applications. Successful design of the materials, however, has been rare due to the improvement of mutually exclusive properties as conventionally speculated. In this paper, we demonstrate that these contradictory material properties can be improved simultaneously if the interfacial energies of heterogeneous interfaces are carefully controlled. We uniformly disperse γ-Al2O3 nanoparticles over Cu matrix, and then we controlled atomic level morphology of the interface γ-Al2O3//Cu by adding Ti solutes. It is shown that the Ti dramatically drives the interfacial phase transformation from very irregular to homogeneous spherical morphologies resulting in substantial enhancement of the mechanical property of Cu matrix. Furthermore, the Ti removes impurities (O and Al) in the Cu matrix by forming oxides leading to recovery of the electrical conductivity of pure Cu. We validate experimental results using TEM and EDX combined with first-principles density functional theory (DFT) calculations, which all consistently poise that our materials are suitable for industrial applications.

show abstract

Section: Resultsmentioning

confidence: 60%

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Han

Kim

Kang

et al. 2015

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although the positive role of Ti doping in Cu‐Al 2 O 3 composites is confirmed previously, [ 14,23 ] the mechanisms are still poor. Recent studies by TEM characterization with high resolution and density functional calculations reveal the formation complex oxides and the modification of matrix/particle interfacial energy.…”

Section: Discussion and Outlookmentioning

confidence: 79%

“…However, this point was neglected in many published articles as the locations of microscopic observation are missed. [ 13,14,19 ]…”

Section: Discussion and Outlookmentioning

confidence: 99%

See 1 more Smart Citation

Factors Affecting the Coarsening and Agglomeration of Alumina Particles in Cu–Al₂O₃ Composites Prepared with Internal Oxidation

2021

View full text Add to dashboard Cite

In future fusion reactors, the heat sink materials of divertor components have to withstand very high heat fluxes and energetic neutron irradiation, and many restrictions therefore should be satisfied, for example, mechanical properties, thermal behavior, stability under irradiation as well as availability. [1,2] These factors indeed rule out many materials categories, while Cu alloys exhibit the highest potential particularly because of the high thermal conductivity of pure base metal, [3] even though the thermal conductivity may be impaired when small amount of elements are alloyed to improve the strength. [4] Secondary phase strengthening is the most suitable route to compromise all these requirements among all the strengthening strategies, and CuCrZr is one of the mature precipitation hardened Cu alloys investigated for heat sink applications and has already been selected for the use in international thermal-nuclear experimental reactor (ITER). [5,6] However, the inadequate stability of strengthening phases in CuCrZr at elevated temperatures or under irradiation restricts its applications in future fusion reactors. An alumina dispersion strengthened Cu (DS-Cu) alloy, AL-25, has been investigated widely and considered for heat sink applications over 20 years. [7] AL-25 indeed exhibits superior irradiation resistance than CuCrZr, [8] but it still shows some drawbacks regarding mechanical properties at elevated temperatures and fracture toughness. The microscopic characteristics, for example, size, shape, number density, distribution, and interfacial structures, of nano-sized oxides therefore should be further modified to meet the requirements of demonstration reactor (DEMO) as they are the main source of beneficial properties of DS-Cu. Recently, many efforts have been devoted to the use of novel oxides, for example, Y 2 O 3 , or alternative fabricating routes, for example, mechanical alloying. [9][10][11] But traditional internal oxidation is still an attractive fabricating route because of its inherent merits such as reduced contamination and capability of mass production as well as the well-established baseline from the Cu-Al 2 O 3 system. From the viewpoint of microstructures, the alumina particles, either inter-or intragranular, in traditional Cu-Al 2 O 3 composites fabricated with internal oxidation are prone to coarsening and agglomeration, [12] which may be detrimental to ductility and irradiation resistance. Possibilities of tailoring oxides in DS-Cu through element doping, for example, Ag and Ti, have been shown already. [13,14] To tailor the nano-sized oxides intentionally, one should gain insight into the relationship between these microscopic characteristics and experimental details of internal oxidation. In this article, the origins of coarsening and agglomeration of alumina particles were uncovered through a dedicated combining investigation between powder metallurgy and Rhines-pack method, [15] and contributing factors, such as grain boundaries, diffusion distance, concentration of Al, atomizatio...

show abstract

“…Even worse, coarsening and agglomeration of Al 2 O 3 particles are accelerated due to the presence of water vapor during the internal oxidation process, and coarse and agglomerated particles are generated on the powder surface during water atomization. Ti doping was also found to effectively refine the size and modify the intergranular and intragranular Al 2 O 3 particles [77,78]. Similar work was also carried out on the effect of Ag addition on the morphology and size distribution of Al 2 O 3 /Cu composites [79].…”

Section: Raw Materials Pretreatment Techniquementioning

confidence: 76%

Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy: preparation, performance, and mechanisms

Yan

Kou

Yang

et al. 2023

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

Copper matrix composites doped with ceramic particles are known to effectively enhance the mechanical properties, thermal expansion behavior and high-temperature stability of copper while maintaining high thermal and electrical conductivity. This greatly expands the applications of copper as a functional material in the fields of thermal and conductive components, including electronic packaging materials and heat sinks, brushes, integrated circuit lead frames, etc. So far, endeavors have been focusing on how to choose suitable ceramic components and fully exert the strengthening effect of ceramic particles in the copper matrix. This article reviews and analyzes the effects of preparation techniques and the characteristics of ceramic particles, including ceramic particle content, size, morphology and interfacial bonding, on the diathermancy, electrical conductivity and mechanical behavior of copper matrix composites. The corresponding models and influencing mechanisms are also elaborated in depth. This review contributes to a deeper understanding of the strengthening mechanisms and microstructural regulation of ceramic particle reinforced copper matrix composites. By more precise design and manipulation of composite microstructure can help to further improve their comprehensive properties and meet the growing demands in the fields of functional materials.

show abstract

Ti-added alumina dispersion-strengthened Cu alloy fabricated by oxidation

Cited by 21 publications

References 14 publications

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Factors Affecting the Coarsening and Agglomeration of Alumina Particles in Cu–Al₂O₃ Composites Prepared with Internal Oxidation

Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy: preparation, performance, and mechanisms

Contact Info

Product

Resources

About

Ti-added alumina dispersion-strengthened Cu alloy fabricated by oxidation

Cited by 21 publications

References 14 publications

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Design of exceptionally strong and conductive Cu alloys beyond the conventional speculation via the interfacial energy-controlled dispersion of γ-Al2O3 nanoparticles

Factors Affecting the Coarsening and Agglomeration of Alumina Particles in Cu–Al2O3 Composites Prepared with Internal Oxidation

Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy: preparation, performance, and mechanisms

Contact Info

Product

Resources

About

Factors Affecting the Coarsening and Agglomeration of Alumina Particles in Cu–Al₂O₃ Composites Prepared with Internal Oxidation