Internal oxidation of dilute Cu-Ti alloys

Wood, S.; Adamonis, Donald C.; Guha, A.; Soffa, W.A.; Meier, G. H.

doi:10.1007/bf02642309

Cited by 31 publications

(6 citation statements)

References 13 publications

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“…Figure 3 shows the effect of the mass ratio of Most oxides were large and triangular, hexagonal or polygonal in shape in the Cu-Al system, and fine, slightly ellipsoidal in the CuTi system. These were the same as the results by Yamada and Komatsu (7) and Wood et al (16).…”

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confidence: 91%

Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation

et al. 1985

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alloys internally oxidized over the temperature range 1073-1323K were investigated by X-ray diffractometry, optical and electron microscopy and microvickers hardness testing.identified in internally oxidized Cu-Al alloys and rutile and anatase type TiO2 ininternally oxidized CuTi alloys. In internally oxidized Cu-Al-Ti alloys, all of the oxides observed in the both above Cu-Al and Cu-Ti systems were identified, and no other complex oxides were detected.By electron microscopy, it was revealed that the particle size of dispersed oxide was remarkably decreased with addition of a small amount of titanium into Cu-Al alloy. In accord with the results from electron microscopy, the microvickers hardness increased with the mass ratio of TiO2 to total oxide.The internally oxidized Cu-Al-Ti alloys possessed excellent qualities that belonged to the internally oxidized Cu-Al and Cu-Ti alloys.

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confidence: 91%

Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation

et al. 1985

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“…Internal oxidation has been studied for several decades (Ref 8,(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40). The mechanism is extensively discussed in the literature.…”

Section: Effect Of Metallic Nanonetwork On the Diffusion Mechanismmentioning

confidence: 99%

Effect of Element Diffusion Through Metallic Networks During Oxidation of Type 321 Stainless Steel

Zeng

Natesan

Cai

et al. 2014

J. of Materi Eng and Perform

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A detailed study was conducted on localized oxidation on Type 321 stainless steel (321ss) using synchrotron x-ray nanobeam analysis along with Raman microscopy. The results showed the presence of metallic nanonetworks in the oxide scales, which plays an important role in the continued oxidation of the alloy at 750°C. A mechanism is proposed to explain the rapid oxidation of 321ss in complex gaseous environments at elevated temperature. Neutral metal atoms could diffuse outward, and carbon atoms could diffuse inward through the metallic nanonetworks in oxide layers. Alternately, diffusion tunnels can dramatically affect the phase composition of the oxide scales. Since the diffusion rate of neutral metal and carbon atoms through the metallic nanonetworks can be much faster than the diffusion of cations through Cr 2 O 3 , the metallic nanonetwork provides a path through the protective Cr 2 O 3 layer for the rapid outward diffusion of metallic chromium and iron atoms to the nonprotective spinel layer. This diffusion process affects the solidstate reaction near the alloy-oxide boundary, and a dense Cr 2 O 3 protective layer does not form. The classic stable structure of the oxide scales, with a dense Cr 2 O 3 layer at the bottom, is damaged by the rapid diffusion through the tunnel at the reaction front, resulting in locally accelerated oxidation. This process can subsequently lead to ''breakaway'' oxidation and catastrophic failure of the alloy.

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“…One rather revolutionary concept would be a bilayer interconnect consisting of dispersion-strengthened Cu on the cathode side and Cr on the anode side. Dispersionstrengthened Cu can be readily produced by internal oxidation [39]. A candidate starting alloy would be Cu-Ti (now sold commercially by Brush-Wellman) which could be formed into the desired shape and then internally oxidized to form TiO 2 precipitates in a matrix of virtually pure Cu.…”

Section: Task 34 Coatingsmentioning

confidence: 99%

Fundamental Studies of the Durability of Materials for Interconnects in Solid Oxide Fuel Cells

Pettit¹,

Meier²

2003

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This report describes the result of the first eight months of effort on a project directed at improving metallic interconnect materials for solid oxide fuel cells (SOFCs). The results include cyclic oxidation studies of a group of ferritic alloys, which are candidate interconnect materials. The exposures have been carried out in simulated fuel cell atmospheres. The oxidation morphologies have been characterized and the ASR has been measured for the oxide scales. The effect of fuel cell electric current density on chromia growth rates has been consideredThe thermomechanical behavior of the scales has been investigated by stress measurements using x-ray diffraction and interfacial fracture toughness measurements using indentation. The ultimate goal of this thrust is to use knowledge of changes in oxide thickness, stress and adhesion to develop accelerated testing methods for evaluating SOFC interconnect alloys.Finally a theoretical assessment of the potential for use of "new" metallic

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Internal oxidation of dilute Cu-Ti alloys

Cited by 31 publications

References 13 publications

Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation

Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation

Effect of Element Diffusion Through Metallic Networks During Oxidation of Type 321 Stainless Steel

Fundamental Studies of the Durability of Materials for Interconnects in Solid Oxide Fuel Cells

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Internal oxidation of dilute Cu-Ti alloys

Cited by 31 publications

References 13 publications

Dispersion Hardening of Cu&ndash;Al&ndash;Ti Alloys by Internal Oxidation

Dispersion Hardening of Cu&ndash;Al&ndash;Ti Alloys by Internal Oxidation

Effect of Element Diffusion Through Metallic Networks During Oxidation of Type 321 Stainless Steel

Fundamental Studies of the Durability of Materials for Interconnects in Solid Oxide Fuel Cells

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Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation

Dispersion Hardening of Cu–Al–Ti Alloys by Internal Oxidation