Processing and mechanical properties of AI2O3 fiber-reinforced NiAl composites

Bowman, Randy R.; Misra, Ajay; Arnold, Steven M.

doi:10.1007/bf02663910

Cited by 60 publications

(17 citation statements)

References 30 publications

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“…However, NiAl is too brittle at room temperature and it has poor creep properties in respect to more conventional alloys [1][2][3][4]. Major efforts have been centered on enhancing the mechanical properties through grain refinement, micro and macroalloying as well as ductile phase toughening [5][6][7]. Also, recent theoretical work has indicated promising results through grain refinements [8].…”

Section: Introductionmentioning

confidence: 95%

Corrosion performance of NiAl intermetallic with Mo, Ga and Fe in neutral and alkaline media

Albiter

Espinosa-Medina

Casales³

2004

Journal of Applied Electrochemistry

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The corrosion resistance of mechanically alloyed NiAl intermetallics with additions of Mo, Ga and Fe, and their combinations, has been studied using potentiodynamic polarization curves and linear polarization resistance tests at room temperature. Solutions included 0.5 M NaCl and 0.5 M NaOH. The Al-42Ni+6Fe and Al-40Ni+6Fe+2Mo alloys exhibited the best corrosion resistance in NaCl whereas the highest corrosion rate was observed on Al-39Ni+6Fe+6Mo alloy, above the NiAl-base alloy. In NaOH, the highest corrosion rate was exhibited by Al41Ni+6Mo alloy, whereas the best corrosion performance was obtained by alloys with 6Ga, followed by alloys containing 6Fe+2Ga and/or 2Mo+2Ga, and NiAl-base alloy had an intermediate corrosion rate. The alloys with the lowest corrosion rate also had the lowest pitting potential values. So, generally speaking, additions of 6Mo decreased the corrosion resistance of NiAl-base alloys in these environments. The results were supplemented by detailed scanning electronic microscopy studies and chemical microanalysis of the corroded specimens.

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Section: Introductionmentioning

confidence: 95%

Corrosion performance of NiAl intermetallic with Mo, Ga and Fe in neutral and alkaline media

Albiter

Espinosa-Medina

Casales³

2004

Journal of Applied Electrochemistry

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“…In Fig. 13, 850 K is defined as the stress free temperature [6]. For comparison, the compressive strength of sapphire along c-axis is also given in Fig.…”

Section: Fiber Damage and Results Of Fem Analysis On Thermal Axial Comentioning

confidence: 99%

“…Additionally, the mechanical performance of NiAl composites is also strongly affected by the remaining fiber quality after the fabrication process. This problem is particularly pronounced in sapphire-fiber reinforced NiAl composites, for which fiber damage, that is mainly fiber cracking as reported [6,10] and fiber strength degradation [10][11][12], occur during hot pressing. The extent of the fiber damage and strength degradation is sensitively dependent on interface structure and chemistry [6,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…A promising way to overcome these deficiencies is to reinforce NiAl by means of continuous ceramic fibers. In the past two decades intensive investigations were carried out in order to explore the possibility of NiAl composites as structural components for load bearing applications at high temperatures [1][2][3][4][5][6][7][8][9]. Due to the good chemical compatibility between NiAl and Al 2 O 3 -fiber at elevated temperatures, some polycrystalline fibers (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on NiAl composites fabricated by matrix coated single crystalline Al2O3-fibers with and without hBN interlayer

Chen

Zhong

et al. 2008

Front. Mater. Sci. China

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The intermetallic compound NiAl has excellent potential for high temperature structural applications but suffers from low temperature brittleness and insufficient high temperature strength. One way to remove these deficiencies is the reinforcement by high strength ceramic fibers. Such intermetallic matrix composites can be conveniently fabricated by the hot pressing of matrix coated fibers. Al 2 O 3 single crystal fibers show excellent chemical stability with the NiAl matrix, but the residual thermal compressive stresses during cool down dramatically degrades the fiber strength and thus, renders the composite useless for structural applications. We report on an experimental and computational study to mitigate this problem and to fabricate Al 2 O 3 /NiAl composites with sufficient high temperature strength. Analytical TEM, mechanical testing and push-out tests were employed to characterize chemistry, microstructure and mechanical properties of the composites. It will be shown that a processing window exists that allows producing intermetallic matrix composites with promising mechanical properties.

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“…However, the brittleness at room temperature and inadequate yield strength at high temperatures prevent them from industrial application. Recently, a few studies have been carried out to improve the ambient temperature ductility by micro-alloying and macro-alloying [4][5][6]. As to their elevated temperature strength, one possible approach is to incorporate metallurgically stable, hard and fine ceramic particles in nickel aluminides [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Laser melted TiC reinforced nickel aluminide matrix in situ composites

Chen

Wang

2005

Journal of Alloys and Compounds

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Titanium carbide reinforced nickel aluminide matrix in situ composites were produced using a newly patented laser melting furnace. Microstructure of the laser melted TiC/(Ni 3 Al-NiAl) in situ composites was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results showed that the constituent phases in the laser melted in situ composites are TiC, Ni 3 Al and NiAl. Volume fraction of TiC and NiAl increase with increasing content of titanium and carbon. The growth morphology of the reinforcing TiC carbide has typically faceted features, indicating that the lateral growth mechanism is still predominant growth mode under rapid solidification conditions.

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Processing and mechanical properties of AI2O3 fiber-reinforced NiAl composites

Cited by 60 publications

References 30 publications

Corrosion performance of NiAl intermetallic with Mo, Ga and Fe in neutral and alkaline media

Corrosion performance of NiAl intermetallic with Mo, Ga and Fe in neutral and alkaline media

Investigations on NiAl composites fabricated by matrix coated single crystalline Al2O3-fibers with and without hBN interlayer

Laser melted TiC reinforced nickel aluminide matrix in situ composites

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