Formation of Cr and Cr2Nb precipitates in rapidly solidified Cu-Cr-Nb ribbon

Ellis, David L.; Michal, G. M.

doi:10.1016/0304-3991(89)90189-7

Cited by 27 publications

(38 citation statements)

References 5 publications

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“…Firstly, as mentioned above melt spinning is a near-net-shape casting technique, forming membranes in the desired thickness and width directly from the melt. Secondly, the resulting metastable microstructure affords greater control over the final microstructure, allowing grain growth (and possibly nucleation) to be tailored such that the resulting alloys feature a finer microstructure than bulk annealed material [202][203][204][205][206][207].…”

Section: Melt Spinningmentioning

confidence: 99%

Non-Pd BCC alloy membranes for industrial hydrogen separation

Dolan

2010

Journal of Membrane Science

247

152

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Section: Melt Spinningmentioning

confidence: 99%

Non-Pd BCC alloy membranes for industrial hydrogen separation

Dolan

2010

Journal of Membrane Science

247

152

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“…During aging at 1200°C, the alternating bcc-Cr/bcc-Mo morphology remained stable, but the growing Laves phase on the grain boundary consumed more and more of the Cr-rich bcc phase[934]. Laves phase were developed in the early 1990s as liners in rocket engine main combustion chambers[937][938][939][940][941][942][943][944]. Best properties were obtained for a Cu alloy containing 8 at.% Cr and 4 at.% Nb, which consists of a Cu matrix with about 14 vol.% of NbCr 2 Laves phase.…”

mentioning

confidence: 99%

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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“…The stability and melting point of Cr 2 Nb is so high that it begins to precipitate in the molten GRCop-84 before the onset of primary Cu solidification. [26] These stable Cr 2 Nb precipitates do not significantly coarsen during the brazing heat treatment or during use at high temperatures. Figures 2 and 3 show the as-received and post brazed microstructures for AMZIRC.…”

Section: Thermal Expansion Proceduresmentioning

confidence: 94%

Comparison of GRCop-84 to Other Cu Alloys with High Thermal Conductivities

Groh

Ellis

Loewenthal

2008

J. of Materi Eng and Perform

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The mechanical properties of six highly conductive copper alloys, GRCop-84, AMZIRC, GlidCop Al-15, Cu-1Cr-0.1Zr, Cu-0.9Cr, and NARloy-Z were compared. Tests were done on as-received hard drawn material, and after a heat treatment designed to simulate a brazing operation at 935 °C. In the as-received condition AMZIRC, GlidCop Al-15, Cu1Cr-0.1Zr and Cu-0.9Cr had excellent strengths at temperatures below 500 °C. However, the brazing heat treatment substantially decreased the mechanical properties of AMZIRC, Cu-1Cr-0.1Zr, Cu-0.9Cr, and NARloy-Z. The properties of GlidCop Al-15 and GRCop-84 were not significantly affected by the heat treatment. Thus there appear to be advantages to GRCop-84 over AMZIRC, Cu-1Cr-0.1Zr, Cu-0.9Cr, and NARloy-Z if use or processing temperatures greater than 500 °C are expected. Ductility was lowest in GlidCop Al-15 and Cu-0.9Cr; reduction in area was particularly low in GlidCop Al-15 above 500 °C, and as-received Cu-0.9Cr was brittle between 500 and 650 °C. Tensile creep tests were done at 500 and 650 °C; the creep properties of GRCop-84 were superior to those of brazed AMZIRC, Cu-1Cr-0.1Zr, Cu-0.9Cr, and NARloy-Z. In the brazed condition, GRCop-84 was superior to the other alloys due to its greater strength and creep resistance (compared to AMZIRC, Cu-1Cr-0.1Zr, Cu-0.9Cr, and NARloy-Z) and ductility (compared to GlidCop Al-15).Keywords GRCop-84, AMZIRC, GlidCop Al-15, Cu-Cr-Zr, Cu-Cr, NARloy-Z, Copper, compression, tension, creep, mechanical properties IntroductionGRCop-84 (Cu-8 at%Cr-4 at% Nb) is a newly-developed copper alloy with an attractive balance of high temperature strength, creep resistance, low cycle fatigue life, and thermal conductivity. Our goal is to compare GRCop-84 to similar commercial copper alloys in a consistent manner. Data on alloys such as NARloy-Z, AMZIRC, GlidCop Al-15 low oxygen grade, Cu-0.9Cr, and Cu-1Cr-0.1Zr can be found in the literature. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] However, the test conditions are rarely matching for "apples-to-apples" comparisons. Most literature also deals only with as-received material. The alloys being considered in this work are used in high temperature applications where high thermal conductivity, high strength, and resistance to creep and low cycle fatigue are required. Such applications include high performance metal gaskets, rocket engine combustion chambers, nozzle liners, and various Reusable Launch Vehicle (RLV) technologies. [1] In regeneratively cooled combustion chamber applications, such as nozzle liners, these alloys are subjected to the combustion gas temperatures on the hot side and are cooled by cryogenic hydrogen flow on the back side. The tensile, creep, low cycle fatigue, and compressive strength of GRCop-84 will be compared to those of the existing commercially available alloys shown in Table 1. To compare the properties these alloys would actually have during use, they were tested in the as-received condition and after a heat treatment designed to simulate a typical high temperature brazing...

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Formation of Cr and Cr2Nb precipitates in rapidly solidified Cu-Cr-Nb ribbon

Cited by 27 publications

References 5 publications

Non-Pd BCC alloy membranes for industrial hydrogen separation

Non-Pd BCC alloy membranes for industrial hydrogen separation

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Comparison of GRCop-84 to Other Cu Alloys with High Thermal Conductivities

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