Microstructure control of Cu-base metallic glass powder composites by extrusion

Kim, T.-S.; Lee, S.-Y.; Lee, J.-K.; Kim, H.-J.; Kim, D.H.; Bae, Jung Chan

doi:10.1016/j.msea.2006.03.143

Cited by 9 publications

(1 citation statement)

References 11 publications

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“…And the contents of Ni and Al in Cr(Mo) phase in the IC alloy are much higher than that in the CC alloy as well. According with the research carried out by Kim et al [13], when the cooling rate is high, it is difficult for elements to diffuse from the L/S interface, which leads to more elements solid soluting in phases. In the present investigated eutectic alloy, the refined lamellar microstructure results in more NiAl and Cr(Mo) phases interfaces, which effectively repress the elements diffusion across the NiAl-Cr(Mo) interfaces, combining the characteristics of the eutectic solidification.…”

Section: Microstructure Characteristicsmentioning

confidence: 99%

Microstructure and mechanical properties of rapidly solidified NiAl–Cr(Mo) eutectic alloy doped with trace Dy

Sheng

Jianting

Tian

et al. 2009

Journal of Alloys and Compounds

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Section: Microstructure Characteristicsmentioning

confidence: 99%

Microstructure and mechanical properties of rapidly solidified NiAl–Cr(Mo) eutectic alloy doped with trace Dy

Sheng

Jianting

Tian

et al. 2009

Journal of Alloys and Compounds

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Processing Porous Bulk Metallic Glass Using Prealloyed Powders

Liu

Zhu

et al. 2010

Adv Eng Mater

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Bulk metallic glasses have been considered as promising structural and functional materials because of their high mechanical strength, excellent soft-magnetic properties and corrosion resistance. [1][2][3] Recently, porous metallic glasses have gained more and more attentions. On the one hand, this kind of material has the advantages of porous metallic materials, such as low specific weight, high gas permeability and high energy-absorption ability; on the other hand, it inherits the excellent physical and chemical properties of metallic glasses: for example, high corrosion resistance. [4] Thus, porous metallic glasses have a tremendous potential for applications as energy absorbers, in ultralight-weight materials, highly sensitive sensors, catalysts and hydrogen-storage media. [5][6][7] Compared with their brittle solid forms, porous metallic glasses usually exhibit high ductility. [8,9] In the porous structure, the shear bands will interact with the pores, and are blocked from propagating; thus, the nucleation and formation of cracks are suppressed. On the other hand, the presence of pores will generate a multiaxis stress field, and induce multiple shear bands, which may also interact with each other and increase the ductility of the matrix. [10] However, the ductility of porous metallic glasses depends highly on the pore size, content, structure and processing history.There are several methods for preparing porous metallic glasses, which can be roughly divided into ingot metallurgy and powder metallurgy. Schroers et al. [11] mixed a Pd-based metallic glass melt with hydrated B 2 O 3 , which then evaporated at high temperatures and resulted in a foam structure. Wada et al. [10] prepared a bulk glassy Pd-based alloy in a high-pressure hydrogen atmosphere, and a porous structure was able to form through the dissolution and evaporation of H 2 . A metallic-glass melt can also infiltrate a porous ceramic skeleton or foaming agent that can be dissolved to form porous structures. [12,13] By using a dealloying method, a porous Ti-based metallic glass with nanometer-sized pore structures can be manufactured. [14] The challenge in fabricating porous metallic glasses by cooling samples from their melting temperatures is to prevent crystallization; therefore, a good glass formability and a fast cooling rate are essential. Depending on these two factors, the size and the shape of porous metallic glass are limited. Powder metallurgy is a process involving the consolidation of metallic-glass particles. Metallic-glass powders of high purity can be conveniently fabricated by gas atomization. [15,16] These metallic-glass powders can then be consolidated into bulk forms of different densities by controlling the densification parameters. Typical consolidation methods include hot extrusion, [17] hot pressing, [18] spark-plasma sintering [19] and microwave sintering. [20] Since metallic-glass powders are very brittle and spherical in shape, it is hard to deform them at room temperature. Usually, metallic-glass powders are reportedly ...

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