Intermetallic-matrix composites—a review

Ward‐Close, C.M.; Minor, Ray; Doorbar, Phillip J.

doi:10.1016/0966-9795(95)00037-2

Cited by 218 publications

(91 citation statements)

References 55 publications

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“…Intermetallic compounds have been paid great attention for their potential application as high temperature structural materials, due to the possibility of combining the ductility of metals and the strength and oxidation resistance of ceramics [1]. One such is the Ni 3 Si compound, noted for its high melting point, excellent oxidation resistance and high strength at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…A number of trials have been carried out to improve its ductility and a significant body of fundamental research into phase formation and microstructural evolution under different processing conditions has been amassed. One potential route to overcome this difficulty is to form intermetallic-metal matrix composites by incorporating a ductile phase into the brittle matrix, or by solidifying a ductile phase directly from the parent melt, to form a so-called in-situ composite [1,7].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution and Phase Formation in Rapidly Solidified Ni-25.3 At. Pct Si Alloy

Cao

Mullis

2015

Metall Mater Trans A

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The drop-tube technique was used to solidify droplets of the Ni-25.3 at.% Si alloy at high cooling rates. XRD, SEM and TEM analysis revealed that the metastable phase, Ni 25 Si 9 , formed as the dominant phase in all ranges of the droplets, with -Ni 31 Si 12 and 1 -Ni 3 Si also being present. Three different microstructures were observed: the regular and anomalous eutectic structures and near single phase structure containing small inclusions of a second phase, termed here a heteroclite structure. Both eutectic structures comprise alternating lamellae of Ni 25 Si 9 and 1 -Ni 3 Si, which, we conjecture, is a consequence of an unobserved eutectic reaction between the Ni 25 Si 9 and 1 -Ni 3 Si phases. The matrix of the heteroclite structure is also identified as the metastable phase Ni 25 Si 9 , in which twined growth is observed in the TEM. As the cooling rate is increased (particle size decreased) the proportion of droplets displaying the entire heteroclite structure tends to increase, with its fraction increasing from 13.91% (300-500 µm) to 40.10% (75-106 µm). The thermodynamic properties of the Ni 25 Si 9 phase were also studied by in-situ heating during XRD analysis and by DTA. This showed the decomposition of Ni 25 Si 9 to 1 and -Ni 31 Si 12 for temperatures in excess of 790 K (517°C).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Phase Formation in Rapidly Solidified Ni-25.3 At. Pct Si Alloy

Cao

Mullis

2015

Metall Mater Trans A

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“…1,2) Currently employed TMCs manufacturing processes include solid-state diffusion bonding processes, such as powder cloth and foil-fiber-foil as well as matrix coated monotapes and matrix coated fiber produced by plasma spraying and electron beam evaporation respectively. [3][4][5][6][7][8][9] The demanding requirements during TMCs processing are minimum fiber damage and matrix-fiber interaction, control over fiber alignment and spacing, and good matrix properties, all of which are critical factors in determining the mechanical properties of TMCs.…”

Section: Introductionmentioning

confidence: 99%

Tensile Failure Behavior of SiC/Ti-6Al-4V Composites Manufactured by Plasma Spraying Route

Baik

2006

Mater. Trans.

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In this study, multi-ply SiC fiber reinforced Ti-6Al-4V composites have been manufactured by a novel plasma spraying technique and subsequent vacuum hot pressing. Two different sizes of Ti-6Al-4V feedstock powders were used for plasma spraying to form matrix. A considerable amount of oxygen from environment was incorporated into as-sprayed Ti matrix during plasma spraying, and consequently caused matrix embrittlement. The use of coarse-sized feedstock powder reduced oxygen incorporation, but tended to increase fiber spacing irregularity and fiber strength degradation. Longitudinal tensile strength and ductility of the SiC/Ti-6Al-4V composites in this study were mainly affected by Ti matrix properties. The embrittlement of Ti matrix occurred at oxygen contents higher than $0:4 mass%, and consequently reduced the tensile strength and ductility of SiC/Ti-6Al-4V composites.

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“…One potential route to overcome this difficulty is to form intermetallic-metal matrix composites by incorporating a ductile phase into the brittle matrix, or by solidifying a ductile phase directly from the parent melt, to form a so-called insitu composite [6][7][8]. Another potential route to improve this lack of formability is nonequilibrium processing via rapid solidification.…”

Section: Introductionmentioning

confidence: 99%

Solidification morphology and phase selection in drop-tube processed Ni–Fe–Si intermetallics

Cao

Mullis

2015

Intermetallics

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Drop-tube processing was used to rapidly solidify droplets of Ni 64.7 Fe 10 Si 25.3 and Ni 59.7 Fe 15 Si 25.3 alloys. In the larger droplets, and therefore at low cooling rates, only two phases, -Ni 31 Si 12 and 1 -Ni 3 Si were observed. Conversely, in the smaller droplets, and therefore at higher cooling rates, the metastable phase Ni 25 Si 9 was also observed. The critical cooling rate for the formation of Ni 25 Si 9 was estimated as 5×10 and as yet unidentified, phase. These results indicate that there is an extended stability field for Ni 25 Si 9 in the Ni-rich part of the Ni-Fe-Si ternary system in comparison to the Ni-Si binary system. With an increase of cooling rate, an increasing fraction of small droplets experience high undercoolings and, therefore, can be undercooled into the Ni 25 Si 9 stability field forming droplets consisting of only the anomalous structure (III). The Fe atoms are found to occupy different substitutional sites in different phase, i.e. Fe substitutes for Ni in the phase and Si in the L1 2 ( 1 ) phase respectively.

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Intermetallic-matrix composites—a review

Cited by 218 publications

References 55 publications

Microstructural Evolution and Phase Formation in Rapidly Solidified Ni-25.3 At. Pct Si Alloy

Microstructural Evolution and Phase Formation in Rapidly Solidified Ni-25.3 At. Pct Si Alloy

Tensile Failure Behavior of SiC/Ti-6Al-4V Composites Manufactured by Plasma Spraying Route

Solidification morphology and phase selection in drop-tube processed Ni–Fe–Si intermetallics

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