Rh-base refractory superalloys for ultra-high temperature use

Yamabe‐Mitarai, Yoko; Koizumi, Yutaka; Murakami, Hideyuki; Ro, Y.; Maruko, Tomohiro; Harada, Hiroshi

doi:10.1016/s1359-6462(96)00408-3

Cited by 86 publications

(30 citation statements)

References 1 publication

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“…In both cases, the advantages of PGM-based intermetallics over Ni-based superalloys are a significantly higher melting point (ϳ1500ЊC for Pt 3 Al and ϳ2100ЊC for RuAl) and inherent oxidation resistance, albeit with some increase in density. Recent reviews of these alloys are presented by Wolff et al 18,19 and YamabeMitarai et al 20 Most of the attention has been focused on Pt-and Ru-based compounds, but there have been some studies of Ir-based 21 and Rh-based 22 materials. Progress toward the desired properties has been either by alloying to improve strength and reduce density or by oxide-dispersion strengthening (ODS).…”

Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

259

102

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This introductory article provides the background for the September 2003 issue of MRS Bulletin on Ultrahigh-Temperature Materials for Jet Engines. It covers the need for these materials, the history of their development, and current challenges driving continued research and development. The individual articles that follow review achievements in four different material classes (three in situ composites-based on molybdenum silicide, niobium silicide, and silicon carbide, respectively-and high-melting-point platinum-group-metal alloys), as well as advances in coating systems developed both for oxidation protection and as thermal barriers. The articles serve as a benchmark to illustrate the progress made to date and the challenges ahead for ultrahigh-temperature jet-engine materials.

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Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

259

102

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“…Appropriate alloying and heat treatment of these so-called refractory superalloys should lead to a fine distribution of a coherently embedded ␥Ј phase with L1 2 structure. [2][3][4][5][6][7][8][9][10][11][12][13][14] A major drawback of Ir and Rh alloys is their brittleness. [15] Hill and co-workers conducted an extensive assessment of systems with Pt as the major constituent.…”

Section: Introductionmentioning

confidence: 99%

“…[15] Hill and co-workers conducted an extensive assessment of systems with Pt as the major constituent. Alloys based on Pt-Al turned out to have the highest potential, not only because of possible precipitation strengthening through Pt 3 Al but also due to high oxidation resistance. [8] It is generally accepted that the L1 2 structure of the ␥Ј phase is a prerequisite for the success of Ni-base superalloys.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing the L12 structure of Pt3Al(r) in the Pt-Al-Sc system

Völkl

Yamabe‐Mitarai

Huang

et al. 2005

Metall Mater Trans A

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The Pt-Al system has high potential to act as alloy base for so-called refractory superalloys. Although the envisaged strengthening phase Pt 3 Al(r) has favorable L1 2 crystal structure only at high temperatures, even small amounts of Sc stabilized L1 2 crystal structure at low temperature. Pt-Al-Sc alloys were arc melted, heat treated, and examined by means of scanning electron microscopy and X-ray diffraction (XRD). Pt 3 Al 1Ϫx Sc x (r) forms a continuous phase field from the Al-rich side to the Sc-rich side of the Pt-Al-Sc ternary system. The absolute value of the lattice misfit between cubic Pt 3 Al 1Ϫx Sc x (r) and the matrix decreases with increasing Sc content.

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“…Recently, we proposed a new class of superalloys, called These specimens were annealed in vacuum (Ͻ 10 Ϫ5 Pa) at refractory superalloys, based on platinum group metals a temperature range of 1573 to 2073 K. Compression tests (PGMs) that are potentially useful at ultra-high temperawere done in air from 293 to 1473 K at an initial strain tures. [11][12][13][14][15] These refractory superalloys have coherent fcc/ rate of 3.0 ϫ 10 Ϫ4 s Ϫ1 . As a measure of room-temperature L1 2 two-phase structures, higher melting temperatures, highductility, the samples were tested to failure and compression temperature strength, and superior oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

Properties of the Ir85Nb15 two-phase refractory superalloys with nickel additions

Yamabe‐Mitarai

et al. 1999

Metall Mater Trans A

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The effects of nickel content on the properties of the polycrystalline Ir 85 Nb 15 refractory superalloy were studied. To examine the possibility of replacing Ir with Ni in Ir 85-X Nb 15 Ni X , we varied the nickel content from 0 to 50 at. pct. The yield strength of the Ir 75 Nb 15 Ni 10 alloy was 2150 MPa at room temperature, much greater than that of the binary Ir 85 Nb 15 alloy, and 728 MPa at 1473 K, similar to that of the binary alloy. The fracture mode of an Ir 85-X Nb 15 Ni X alloy changed from predominantly intergranular in fcc and L1 2 two-phase Ir 85 Nb 15 to transgranular in the two-phase Ir 75 Nb 15 Ni 10 alloy and a mixture of intergranular and transgranular in the other tested alloys when the Ni content exceeded 20 pct. The Ni addition also increased the compression ductility for Ni content up to 50 at. pct. The maximum compression ductility was approximately 13 pct, obtained from Ir 65 Nb 15 Ni 20 . Ir 85-X Nb 15 Ni X two-phase refractory superalloys with X Յ 10 were superior to the binary Ir 85 Nb 15 alloy as an ultrahigh-temperature structural material in terms of strength, fracture behavior, and density.

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Rh-base refractory superalloys for ultra-high temperature use

Cited by 86 publications

References 1 publication

Ultrahigh-Temperature Materials for Jet Engines

Ultrahigh-Temperature Materials for Jet Engines

Stabilizing the L12 structure of Pt3Al(r) in the Pt-Al-Sc system

Properties of the Ir85Nb15 two-phase refractory superalloys with nickel additions

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