The synthesis of TiAl intermetallic films by a rf magnetron sputtering and the mechanical properties of the microcomposites with SiC fibers

1994 ◽  
Vol 9 (4) ◽  
pp. 1028-1034 ◽  
Author(s):  
Takakazu Suzuki ◽  
Hiroyuki Umehara ◽  
Ryuichi Hayashi
Keyword(s):  
Magnetron Sputtering ◽  
Titanium Aluminide ◽  
Rf Magnetron Sputtering ◽  
Strength Properties ◽  
Matrix Composites ◽  
Sic Fibers ◽  
Sic Fiber ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites ◽  
Increasing Temperature

The intermetallic matrix composites reinforced with heat-resistive fibers are expected to improve the ductility and the toughness of intermetallic compounds. Titanium aluminide, TiAl, shows a unique behavior that increases the mechanical strength with increasing temperature up to 1000 K. Vapor phase processings for manufacturing near-net-shaped composites or continuous fiber-reinforced composites will be hopeful methods. The synthesis of TiAl by a magnetron sputtering using a multiple target has been successfully established, and the microcomposites with SiC fibers have been prepared. The TiAl film was evaluated by Auger electron spectroscopy and the x-ray analysis and so on. The tensile strength properties of the SiC/TiAl microcomposites, of which the interface bonding was controlled with the powers of sputtering, were estimated. The results show that the strength properties of SiC/TiAl microcomposites are decreasing with increasing the power of the sputtering, and the irradiation-cured SiC fiber has better compatibility with TiAl than the oxidation-cured SiC fiber.

Microstructural characterization of plasma-processed Ti-Al metal matrix composites

1989 ◽  
Vol 47 ◽  
pp. 552-553
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
M. A. Burke
Keyword(s):  
High Temperature ◽  
Titanium Aluminide ◽  
Plasma Processing ◽  
Microstructural Characterization ◽  
High Temperature Strength ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Long Time ◽  
Strength And Stiffness ◽  
Intermetallic Matrix Composites

Intermetallic matrix composites are candidates for ultrahigh temperature service when light weight and high temperature strength and stiffness are required. Recent efforts to produce intermetallic matrix composites have focused on the titanium aluminide (TiAl) system with various ceramic reinforcements. In order to optimize the composition and processing of these composites it is necessary to evaluate the range of structures that can be produced in these materials and to identify the characteristics of the optimum structures. Normally, TiAl materials are difficult to process and, thus, examination of a suitable range of structures would not be feasible. However, plasma processing offers a novel method for producing composites from difficult to process component materials. By melting one or more of the component materials in a plasma and controlling deposition onto a cooled substrate, a range of structures can be produced and the method is highly suited to examining experimental composite systems. Moreover, because plasma processing involves rapid melting and very rapid cooling can be induced in the deposited composite, it is expected that processing method can avoid some of the problems, such as interfacial degradation, that are associated with the relatively long time, high temperature exposures that are induced by conventional processing methods.

Cross-section TEM sample preparation of Ti-6Al-4V/SCS6 (SiC) fiber-reinforced composites

1992 ◽  
Vol 50 (1) ◽  
pp. 402-403
Author(s):  
Warren J. Moberly ◽  
Scott Apt
Keyword(s):  
Thermal Processing ◽  
Titanium Aluminide ◽  
Thermal Stresses ◽  
Coefficient Of Thermal Expansion ◽  
Hot Isostatic Pressing ◽  
Matrix Composites ◽  
Sic Fiber ◽  
Structural Applications ◽  
The Matrix ◽  
Intermetallic Matrix Composites

Titanium-based metal matrix composites (MMC) and titanium aluminide intermetallic matrix composites (IMC) have been selected for future aerospace structural applications. The mechanical integrity of these composites are dictated by the thermodynamic stability of the fiber / matrix interface and deformation that occurs at the interface. The thermal processing incurred during hot-isostatic-pressing (HIP) results in the formation of intermetallic phases, with detrimental mechanical properties, at the interface. In addition, the thermal processing results in residual stresses due to the mismatch in coefficient of thermal expansion (CTE) between the Ti-based matrix and the SiC fiber. In some cases the thermal stresses are sufficient to cause yielding in the matrix, and/or lead to fatigue from the thermal cycling that will be incurred during application.

Fiber Push-Out Testing of Intermetallic Matrix Composites at Elevated Temperatures

1992 ◽  
Vol 273 ◽  
Author(s):  
Jeffrey I. Eldridge
Keyword(s):  
Residual Stresses ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Elevated Temperatures ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites ◽  
Increasing Temperature ◽  
Push Out

ABSTRACTA newly developed apparatus for performing fiber push-out testing at elevated temperatures has been applied towards testing fiber-reinforced intermetallic and metal matrix composites. This new capability shows the effects of the relief of residual stresses and increased matrix ductility with increasing temperature on fiber debonding and sliding behavior.

Deformation at interfaces of Ti-6Al-4V/SiC fiber composites

1992 ◽  
Vol 50 (1) ◽  
pp. 158-159
Author(s):  
Warren J. Moberly ◽  
Daniel B. Miracle ◽  
S. Krishnamurthy
Keyword(s):  
Thermal Stresses ◽  
Load Transfer ◽  
Coefficient Of Thermal Expansion ◽  
Hot Isostatic Pressing ◽  
Matrix Composites ◽  
Ongoing Research ◽  
Aerospace Applications ◽  
Sic Fiber ◽  
The Matrix ◽  
Intermetallic Matrix Composites

Titanium-aluminum alloy metal matrix composites (MMC) and Ti-Al intermetallic matrix composites (IMC), reinforced with continuous SCS6 SiC fibers are leading candidates for high temperature aerospace applications such as the National Aerospace Plane (NASP). The nature of deformation at fiber / matrix interfaces is characterized in this ongoing research. One major concern is the mismatch in coefficient of thermal expansion (CTE) between the Ti-based matrix and the SiC fiber. This can lead to thermal stresses upon cooling down from the temperature incurred during hot isostatic pressing (HIP), which are sufficient to cause yielding in the matrix, and/or lead to fatigue from the thermal cycling that will be incurred during application, A second concern is the load transfer, from fiber to matrix, that is required if/when fiber fracture occurs. In both cases the stresses in the matrix are most severe at the interlace.

The Mechanics and Mechanical Behavior of High-Temperature Intermetallic Matrix Composites

2000 ◽  
Author(s):  
Ronald Gibala ◽  
Amit K. Ghosh ◽  
David J. Srolovitz ◽  
John W. Holmes ◽  
Noboru Kikuchi
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites

scholarly journals Comparison of NDE Results and Correlation With Microstructural Characteristics of NiFeAl/Wf

1994 ◽  
Author(s):  
David K. Hsu ◽  
Peter K. Liaw ◽  
George Y. Baaklini
Keyword(s):  
Quality Assurance ◽  
Nondestructive Evaluation ◽  
Metal Matrix ◽  
Complex Structure ◽  
Matrix Composites ◽  
Fiber Density ◽  
Microstructural Characteristics ◽  
X Ray ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites

Metal matrix composites (MMC) and intermetallic matrix composites (IMC) are materials of complex structure. Nominally defect-free, as-manufactured MMC requires nondestructive evaluation (NDE) for quality assurance and process monitoring purposes. In this work, three NDE techniques — ultrasonics, eddy current, and X-ray radiography — were applied to un-damaged NiFeAI/Wf coupons. Images of the coupons were obtained using the three techniques. The NDE results were compared among themselves, and correlations were sought between these results and microstructural features of the specimen. Consistencies were found among the NDE results and a strong correlation was found between the spatial variation of fiber density and the NDE signals.

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