Microstructure and mechanical behavior of in-situ directional solidified NiAl/Cr(Mo) eutectic composite

Yang, Jenn‐Ming; Jeng, S. M.; Bain, Kenneth; Amato, R.A.

doi:10.1016/s1359-6454(96)00124-3

Cited by 121 publications

(55 citation statements)

References 18 publications

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“…An exposed cross section (surface of the original notch) and a freshly cut cross section were also examined. While energy dispersive spectroscopy is a tool more commonly used to evaluate composite materials systems [35,36] this study used WDS due to its enhanced accuracy. As no elements with Z < 5 were analyzed the geometric limitation of WDS were not an issue.…”

Section: Materials and Experimental Arrangementsmentioning

confidence: 99%

Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam

Ruggles‐Wrenn

Pope

2015

MATEC Web of Conferences

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Abstract. Creep behavior in interlaminar shear of a non-oxide ceramic composite with a multilayered matrix was investigated at 1200 • C in laboratory air and in steam environment. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated Hi-Nicalon™ fibers woven in a five-harness-satin weave. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. The interlaminar shear properties were measured. The creep behavior was examined for interlaminar shear stresses in the 16-22 MPa range. Primary and secondary creep regimes were observed in all tests conducted in air and in steam. In air and in steam, creep run-out defined as 100 h at creep stress was achieved at 16 MPa. Similar creep strains were accumulated in air and in steam. Furthermore, creep strain rates and creep lifetimes were only moderately affected by the presence of steam. The retained properties of all specimens that achieved run-out were characterized. Composite microstructure, as well as damage and failure mechanisms were investigated. The tested specimens were also examined using electron probe microanalysis (EPMA) with wavelength dispersive spectroscopy (WDS). Analysis of the fracture surfaces revealed significant surface oxidation, but only trace amounts of boron and carbon. Cross sectional analysis showed increasing boron concentration in the specimen interior.

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Section: Materials and Experimental Arrangementsmentioning

confidence: 99%

Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam

Ruggles‐Wrenn

Pope

2015

MATEC Web of Conferences

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“…To determine iffaster growth rates could produce materials with acceptable elevated temperature strength properties, the eutectic system Ni-33Al-33Cr-1Mo (at %) has been directionally solidified at rates ranging from 7.6 to 508 mm/h. This system was chosen since it forms a lamellar eutectic microstructure [1][2][3] comprised ofNiAl and Cr alloyed with Mo {Cr(Mo)} which has demonstrated a room temperature toughness of 17.3 MPa·..Jm [3]. This paper presents the alloy chemistry, microstructure and 1300 K compressive behavior for both as-cast and directionally solidified materials.…”

Section: V'mentioning

confidence: 99%

“…Directional solidification (DS) ofNiAl-X systems has shown promise for the simultaneous improvement of elevated temperature strength and room temperature toughness [1][2][3][4]. In general it was believed that these benefits could only be possible when the structure was perfectly aligned and fault free.…”

Section: Introductionmentioning

confidence: 99%

1300 K Compressive Properties of Directionally Solidified Ni-33Al-33Cr-1Mo

2000

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The Ni-33AI-33Cr-1Mo eutectic has been directionally solidify by a modified Bridgeman technique at growth rates ranging from 7.6 to 508 mm/h to produce grain/cellular microstructures containing alternating plates ofNiAl and Cr alloyed with Mo. The grains had sharp boundaries for slower growth rates (~ 12.7 mm/h) , while faster growth rates (;::: 25.4 mm/h) lead to cells bounded by intercellular regions. Compressive testing at 1300 K indicated that alloys DS' ed at rates between 25.4 to 254 rnmlh possessed the best strengths which exceed that for the as-cast alloy.

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“…This drawback can be overcome by either using protection layers of silicon (Si), B, or by Mo-Si-B compounds. [2,3,4] In addition, the discussion includes oxide dispersion strengthened (ODS) steels (austenitic [5,6] , ferritic [7,8] and ferritic-martensitic [9] ), directionally solidified NiAl-X (Cr, Mo) eutectics [10,11,12,13] , Co-Re alloys [14,15] , and silicon carbide (SiC) [16,17] or carbonfiber-reinforced silicon carbide (C/SiC). Within the current discussion of the "beyond Ni-base super alloys", the authors want to include tungsten laminates as a new innovative material system.…”

Section: Introductionmentioning

confidence: 99%

Tungsten (W) Laminate Pipes for Innovative High Temperature Energy Conversion Systems

et al. 2014

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The aim of this paper is to present the mechanical properties of tungsten laminate pipes made of tungsten foil and to discuss their use in innovative high temperature energy conversion systems.Tungsten is the metal with the highest melting point of all metals and would therefore be an excellent fit for high temperature applications. But tungsten has one major drawback which is its low fracture toughness at room temperature (RT) or its high brittle-to-ductile transition 2 temperature (BDTT). However, one of the extraordinary properties of tungsten is that by cold working the BDTT can be shifted to lower temperatures. At the extreme, this results in a tungsten foil with a BDTT below -120°C combined with a RT fracture toughness of 70 MPa m 1/2 .By rolling up and joining a tungsten foil, tungsten laminate pipes can be synthesized that can dissipate at least 20 J in a Charpy impact test at RT and survive a burst test at RT at 1000 bar without any residual damage. The technical maturity of these W laminate pipes is approved by high heat flux tests performed at the Plataforma Solar de Almería, Spain, as well as at the

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Microstructure and mechanical behavior of in-situ directional solidified NiAl/Cr(Mo) eutectic composite

Cited by 121 publications

References 18 publications

Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam

Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam

1300 K Compressive Properties of Directionally Solidified Ni-33Al-33Cr-1Mo

Tungsten (W) Laminate Pipes for Innovative High Temperature Energy Conversion Systems

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Microstructure and mechanical behavior of in-situ directional solidified NiAl/Cr(Mo) eutectic composite

Cited by 121 publications

References 18 publications

Creep behavior in interlaminar shear of a Hi-NicalonTM/ SiC-B4C composite at 1200∘C in air and in steam

Creep behavior in interlaminar shear of a Hi-NicalonTM/ SiC-B4C composite at 1200∘C in air and in steam

1300 K Compressive Properties of Directionally Solidified Ni-33Al-33Cr-1Mo

Tungsten (W) Laminate Pipes for Innovative High Temperature Energy Conversion Systems

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Product

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Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam

Creep behavior in interlaminar shear of a Hi-Nicalon^TM/ SiC-B₄C composite at 1200^∘C in air and in steam