A comparison of the mechanical properties and microstructures of intermetallic matrix composites fabricated by two different methods

MacKay, Rebecca A.; Draper, Susan L.; Ritter, Ann; Siemers, P. A.

doi:10.1007/bf02665477

Cited by 17 publications

(17 citation statements)

References 12 publications

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“…Tensile failure mechanisms in continuous fiber reinforced metal matrix composite have been proposed in either cumulative failure or non-cumulative failure. 9) Since the fibers have a scattered strength distribution, as evidenced by the data in Fig. 3, it is expected that some fibers will break at very low stresses.…”

Section: Tensile Properties Of Tmcsmentioning

confidence: 93%

“…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%

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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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Section: Tensile Properties Of Tmcsmentioning

confidence: 93%

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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“…Because fiber strength dominates the 0° composite strength, distinctions between processes must be made using the same-or an equivalent-strength fiber lot. One of few such studies made has found equivalent 0°s trength between composites made by powder cloth and plasma spray (MacKay et al, 1994), two very dissimilar processes. This observation was explained by the fact that equivalent strengths were measured in fibers extracted from the composites, even though plasma spraying had produced some exfoliation of the carbon coating.…”

Section: Polymer Matrix Composites*mentioning

confidence: 99%

“…The two thermal-spray processes, arc and plasma spray, share an advantage in uniform fiber placement, but possible long-time fiber degradation due to some exfoliation of the carbon coating must be explored. Of the powderbased processes, both tape casting and the powder-cloth method utilize polymer binders that must be removed prior to final consolidation, although impurity levels in laboratory coupons have been equal to or lower than those measured in MMCs made by competing processes (MacKay et al, 1994). Tape casting is probably to be favored over the powdercloth method as a more continuous process.…”

Section: Polymer Matrix Composites*mentioning

confidence: 99%

Composites research at NASA Lewis research center

Levine

Duffy

Vary

et al. 1994

Composites Engineering

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“…LPPS allows a variety reinforced composites. [1,2,3] Ceramic fibers, such as SiC or of matrices to be sprayed including Al, Ti, and MoSi 2 based Al 2 O 3 , possess a wide spread of strengths because of inherent alloys. [6,[12][13][14][15] This technique has been further developed by internal/surface flaws, which are usually assumed to be ranthe authors to manufacture a multilayer, circumferentially domly distributed.…”

Section: Introductionmentioning

confidence: 99%

Strength degradation of SiC fiber during manufacture of titanium matrix composites by plasma spraying and hot pressing

Baik

Grant

2001

Metall Mater Trans A

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Titanium matrix composites (TMCs) reinforced with Sigma 1140ϩ SiC fiber have been manufactured by a combination of low pressure plasma spraying (LPPS spray/wind) and simultaneous fiber winding, followed by vacuum hot pressing (VHP). Fiber damage during TMC manufacture has been evaluated by measuring fiber tensile strength after fiber extraction from the TMCs at various processing stages, followed by fitting of these data to a Weibull distribution function. The LPPS spray/wind processing caused a decrease in mean fiber strength and Weibull modulus in comparison with as-received fibers. A number of fiber surface flaws, primarily in the outer C layer of the fiber, formed as a result of mechanical impact of poorly melted particles from the plasma spray. Coarse feedstock powders promoted an increase in the population of fiber surface flaws, leading to significant reduction in fiber strength. The VHP consolidation promoted further development of fiber surface flaws by fiber bending and stress localization because of nonuniform matrix shrinkage, resulting in further degradation in fiber strength. In the extreme case of fibers touching, the stress concentration on the fibers was sufficient to cause fiber cracking. Fractographic studies revealed that low strength fibers failed by surface flaw induced failure and contained a large fracture mirror zone. Compared with the more widely investigated foil-fiber-foil route to manufacture TMCs, LPPS/VHP resulted in less degradation in fiber strength for Sigma 1140ϩ fiber. Preliminary results for Textron SCS-6 fiber indicated a much greater tolerance to LPPS/VHP damage.

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A comparison of the mechanical properties and microstructures of intermetallic matrix composites fabricated by two different methods

Cited by 17 publications

References 12 publications

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

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

Composites research at NASA Lewis research center

Strength degradation of SiC fiber during manufacture of titanium matrix composites by plasma spraying and hot pressing

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