Production and processing of Cu“Cr“Nb alloys

Ellis, David L.; Michal, G. M.; Orth, N. W.

doi:10.1016/0956-716x(90)90130-9

Cited by 33 publications

(33 citation statements)

References 3 publications

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“…pct Nb. [30] Also, the preceding observation for MM material is in line with the results of earlier high-temperature aging studies of extruded Cu-Cr 2 Nb, which demonstrated sluggish coarsening behavior for both Cu grains and Cr 2 Nb precipitates, even after 100 hours at 1323 K. [2][3][4][5][6] B. Mechanical Property Evolution upon MM …”

Section: A Microstructure Evolution Upon MMsupporting

confidence: 78%

“…strength and high conductivity coupled with good thermal However, the lower Cr 2 Nb content has an inevitable adverse stability. [1,2] This behavior is due to the insoluble and strong effect on strengthening. To maximize the strengthening of this Cr 2 Nb intermetallic phase (with a 2:1 Cr/Nb ratio) in a copper alloy, i.e., to take advantage of the substantial Hall-Petch matrix.…”

Section: Introductionmentioning

confidence: 94%

“…Melting procedures were based on the methapplications such as first wall, divertor interactive components ods developed at NASA Lewis (Cleveland, Ohio) for similar and magnetic confinement in fusion reactors, combustion Cu-Cr-Nb alloys. [1,2] The chemical composition of the powchamber liners for next-generation reusable launch vehicle ders was 3.27 wt pct ( for 0.5, 1, 2, 4, and 8 hours. Charges of 10 g of powder and using Wilson and Buehler Macromet Rockwell hardness testers (using B scale).…”

Section: Introductionmentioning

confidence: 99%

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Microstructural size effects in high-strength high-conductivity Cu-Cr-Nb alloys

Anderson

Groza

2001

Metall Mater Trans A

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Microstructural refinement to further improve the strength and stability of high-strength high-conductivity Cu-Cr-Nb alloys was attained by mechanical milling (MM). Mechanically milled Cu-4Cr-2Nb and Cu-8Cr-2Nb exhibited an increase in hot-pressed Vickers hardness of 122 and 96 pct, respectively. Mechanical milling produced a corresponding decrease in electrical conductivity of ϳ33 pct for both alloys. The increase in hardness was more due to Cu grain-size refinement than to second-phase particle-size refinement. The drop in conductivity was due to second-phase particle-size refinement, which both increased particle/matrix interfacial area and solute solubility. Mechanically processed Cu4Cr-2Nb displayed an enhanced thermal stability. Hot-pressed 4-hour milled Cu-4Cr-2Nb experienced a 30 pct increase in conductivity with only a 22 pct drop in hardness when annealed at 1273 K for 50 hours. Such changes were largely due to an increase in dispersed-particle size (i.e., a decrease in solute and interfacial electron scattering) and Cu grain size (reduced Hall-Petch effect), respectively. The optimum hardness and conductivity combination was found in 4-hour milled and hot-pressed Cu-4Cr-2Nb material.

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Section: A Microstructure Evolution Upon MMsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Microstructural size effects in high-strength high-conductivity Cu-Cr-Nb alloys

Anderson

Groza

2001

Metall Mater Trans A

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“…3,4 One of these alloys is Cu-8Cr-4Nb, with the trade name of "GRCop-84" (reflecting its composition and the fact that it was developed at the NASA Glenn Research Center). 5 It is now the leading candidate to replace "NARloy-Z" as the liner for the next generation of thrust cells. The other DS alloy investigated is the "Glidcop" family, comprised of three members: Cu-0.3 Al 2 O 3 , Cu-0.6Al 2 O 3 , and Cu-1.1Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

The Oxidation Behavior of an ODS Copper Alloy Cu?Al2O3

Ogbuji

2004

Oxidation of Metals

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The oxidation behavior of wt.% Al 2 O 3 ), an ODS copper alloy of interest for aerospace structural application, was investigated by oxidation and two-step oxidation in a TGA. The results were compared with the oxidation kinetics of pure Cu and two other aerospace Cu alloys, and ). AL-15 exhibited the lowest oxidation rate from 500 to 650 • C. The superiority in oxidation resistance is thought to result from the Al 2 O 3 , and the two-step oxidation results suggest the Al 2 O 3 dissolves in the oxide scale, perhaps creating charge and stress fields that suppress oxidation by retarding the Cu diffusion rate.

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“…This alloy is a fine dispersion of 14 vol. % Cr 2 Nb in Cu, and is characterized by markedly improved mechanical properties wi thout significant reduction of thermal conductivity [1].…”

Section: Introductionmentioning

confidence: 99%

The general isothermal oxidation behavior of Cu–8Cr–4Nb

Ogbuji¹

2004

Materials at High Temperatures

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Oxidation kinetics of Cu-8Cr-4Nb was investigated by TGA exposures between 500 and 900°C (at 25-50°C intervals) and the oxide scale morphologies examined by microscopy and micro-analysis. Because Cu-8Cr-4Nh is comprised of fine Cr2Nb precipitates in a Cu matrix, the results were interpreted by comparison with the behavior of copper (OFRC) and "NARloy-Z" (a rival candidate material for thmst cell liner applications in advanced rocket engines) under the same conditions. While NARloy-Z and Cu exhibited identical oxidation behavior, Cu-8Cr-4Nb differed markedly in several respects: below ~ 700°C its oxidation rates were significantly lower than those of Cu; At higher temperatures its oxidation rates fell into two categories: an initial rate exceeding that of Cu, and a terminal rate comparable to that of Cu. Differences in oxide morphologies paralleled the kinetic differences at higher temperature: While NARloy-Z and Cu produced a uniform oxide scale of CU20 inner layer and CuO outer layer, the inner (CU20) layer on Cu-8Cr-4Nb was stratified, with a highly porous/spongy inner stratum (responsible for the fast initial kinetics) and a dense/blocky outer stratum (corresponding to the slow terminal kinetics). Single and spinel oxides ofNb and Cr were found at the interface between the oxide scale and Cu-8Cr-4Nb substrate and it appears that these oxides were responsible for its suppressed oxidation rates at the intermediate temperatures. No difference was found between Cu-8Cr-4Nb oxidation in air and in oxygen at 1.0 atm.

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Production and processing of Cu“Cr“Nb alloys

Cited by 33 publications

References 3 publications

Microstructural size effects in high-strength high-conductivity Cu-Cr-Nb alloys

Microstructural size effects in high-strength high-conductivity Cu-Cr-Nb alloys

The Oxidation Behavior of an ODS Copper Alloy Cu?Al2O3

The general isothermal oxidation behavior of Cu–8Cr–4Nb

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