Microstructural characterization of a directionally-solidified Ni–33 (at.%) Al–31Cr–3Mo eutectic alloy as a function of withdrawal rate

Raj, S. V.; Locci, Ivan E.

doi:10.1016/s0966-9795(00)00128-x

Cited by 45 publications

(33 citation statements)

References 13 publications

(1 reference statement)

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“…A similar expression was proposed by De Wilde et al [99], who discussed the sensitivity of the constant K relative to the input data. Experiments confirmed the l 2 v = K relationship both for rod-like eutectic in Fe-Si-Mn and Fe-Si-Co as shown by Yamauchi et al [100] and for lamellar eutectics in Al-Cu-Ni by Rinaldi et al [95] Al-Cu-Ag by De Wilde et al [99] and Ni-Al-Cr-Mo by Raj and Locci [101].…”

Section: Coupled Growth and Morphological Stability Of Univariant Eutsupporting

confidence: 57%

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Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

167

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Section: Coupled Growth and Morphological Stability Of Univariant Eutsupporting

confidence: 57%

“…Experimentally observed cellular patterns in other alloy systems including intermetallics [101] and ceramics [6] strongly point in this direction.…”

Section: Coupled Growth and Morphological Stability Of Univariant Eutmentioning

confidence: 93%

Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

167

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“…Overall the microstructures of the present Ni-33Al-33Cr-lMo rods as a function ofDS rate are similar to those found in Ni-33AI-31Cr-3Mo [4,7] as a function of growth rate. The structure in Fig.…”

Section: Resultssupporting

confidence: 76%

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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“…pct. [15,17,19] These rates are generally much with an optimum combination of high elevated-temperature too slow for economic commercial production of any alloy creep properties and room-temperature fracture toughness. even if it is demonstrated to possess all the requisite properAlthough single crystal and polycrystalline alloys with supeties required for turbine airfoil applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of directionally solidified microstructures on the room-temperature fracture-toughness properties of Ni-33(at. pct)Al-33Cr-1Mo and Ni-33(at. pct)Al-31Cr-3Mo eutectic alloys grown at different solidification rates

Raj

Salem

Locci

et al. 2002

Metall Mater Trans A

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Directionally solidified (DS) Ni-33(at. pct)Al-33Cr-1Mo and Ni-33(at. pct)Al-31Cr-3Mo eutectic alloys were grown at different rates varying from 7.6 to 508 mm h Ϫ1 . The microstructures consisted of eutectic colonies with parallel lamellar NiAl/(Cr,Mo) plates for solidification rates at and below 12.7 mm h Ϫ1 . Cellular eutectic microstructures were observed at higher solidification rates, where the plates exhibited a radial pattern. Room-temperature fracture-toughness tests were conducted using a modified ASTM E-399 technique. The average fracture-toughness values for specimens with planar eutectic and cellular microstructures were about 12 to 15 and 17 MPaΊm, respectively, for both alloys. However, the Ni-33(at. pct)Al-33Cr-1Mo specimens grown at and above 254 mm h Ϫ1 exhibited fracture toughness values of about 8 MPaΊm due to the presence of short (Cr,Mo) plates. The fracture toughness values for the Ni-33(at. pct)Al-31Cr-3Mo alloy were also correlated with quantitative microstructural data in an attempt to identify the relevant elements of the microstructure determining resistance to fracture. A phenomenological fracture model is presented in an attempt to rationalize the present observations.

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Microstructural characterization of a directionally-solidified Ni–33 (at.%) Al–31Cr–3Mo eutectic alloy as a function of withdrawal rate

Cited by 45 publications

References 13 publications

Multiphase solidification in multicomponent alloys

Multiphase solidification in multicomponent alloys

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

Effect of directionally solidified microstructures on the room-temperature fracture-toughness properties of Ni-33(at. pct)Al-33Cr-1Mo and Ni-33(at. pct)Al-31Cr-3Mo eutectic alloys grown at different solidification rates

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