NiAl and NiAl-based composites directionally solidified by a containerless zone process

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National Aeronautics and Space Administration, National Technical Information Service, distributor , [Washington, DC], [Springfield, Va
Other titlesNiAl and NiAl based composites directionally solidified by a containerless zone process.
StatementSteven M. Joslin.
SeriesNASA contractor report -- 195430., NASA contractor report -- NASA CR-195430.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL16984199M

This banner text can have markup. web; books; video; audio; software; images; Toggle navigation. A containerless electromagnetically levitated zone (CELZ) process has been used to directionally solidify NiAl and NiAl-based composites.

The CELZ processing results in single crystal NiAl (HP-NiAl) having higher purity than commercially pure NiAl grown by a modified Bridgman process (CP-NiAl).Author: Steven M.

Joslin. Get this from a library. NiAl and NiAl-based composites directionally solidified by a containerless zone process. [Steven M Joslin; United. NiAl-based polyphase in situ composites in the NiAI-Ta-X (X = Cr, Mo, or V) systems performed by containerless processing techniques in a levitation zone refiner to directionally solidified three phase eutectic, provided such systems thermodynamically exist.

Description NiAl and NiAl-based composites directionally solidified by a containerless zone process FB2

Based on the survey study, a near eutectic composition ofNiAlTaV was directionally solidified at 19 mm/h for further NiAl-based polyphase in situ composites study. The microstructure of the directionally soli- dified ingot consisted of vanadium-rich dendrites surrounded by cells or colonies of the three phase by: In addition, various in-situ reinforcement schemes are evaluated for NiAl-based composites produced by containerless processing.

Systems evaluated include the NiAl. Fracture behavior of directionally solidified NiAl-Mo and NiAl-V eutectics. were directionally solidified by the containerless electromagnetically levitated zone (CELZ) process.

Four-point bend tests were used to determine the fracture toughness of the CELZ processed eutectic alloys, while scanning electron microscopy and transmission Cited by: In-situ composites based on the NiAl Cr eutectic system have been successfully produced by containerless processing and evaluated.

Molybdenum additions of to 6 at.% were used to change the eutectic microstructure. The NiAl Cr alloys had a fibrous microstructure, while the NiAl (Cr,Mo) alloys containing 1 at.% or more of molybdenum exhibited a lamellar by: Materials Letters 14 () North-Holland Processing, microstructure and low-temperature properties of directionally solidified NiAl/NiAlNb alloys R.D.

Reviere a, R.D. Noebe b and B.F. Olivera The University of Tennessee, Department of Materials Science, Knoxville, TNUSA 11 NASA Lewis Research Center, Cleveland, OHUSA Received 13 April A containerless litation zone Cited by: 3. Comparison of the and K creep properties of several directionally solidified NiAl-based alloys indicated that DS'ed NiAlTa is one.

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A containerless levitation zone processing technique was used to directionally solidify two Ni-Al-Nb alloys in an attempt to improve the fracture strength and ductility of creep resistant, NiAl. als, directionally solidified alloys from this system may display better strengths than NiAI-NiAINb alloys.

Therefore, the purpose of this study was to characterize the effects of containerless processing on the microstructure, the elevated temperature strength, and the room temperature fracture toughness of in-situ composites based on the NiA1-File Size: KB.

A NiAl–Mo eutectic having a nominal composition of Ni–45Al–10Mo was directionally solidified in a floating-zone furnace at two different growth rates, 20 and 80 mm/h. At the slower growth rate, the Mo fibers in the composite are well-aligned with the growth direction, whereas at the higher growth rate cellular microstructures are by: 7.

of the sintering process on the microstructure of the NiAl-Al 2O 3 composite was analyzed with the main focus on the metal-ceramics interface.

In addition, both the sintering kinetics of separately sintered composite components and the changes in the mechanical properties of materials observed during successive sintering phases were determined. The ordered intermetallic compound β-NiAl and its pseudo-binary off-eutectic alloys with 1 at.% tungsten and at.% chromium were directionally solidified (DS) in the ‘floating-zone’ mode.

Microstructure and room temperature fracture toughness of directionally solidified NiAl–Mo eutectic in situ composites Article in Intermetallics 21(1) February with 5 Reads.

The work of adhesion and the interface energy of NiAl/V coherent interface systems have been investigated using first-principles methods. The adhesion of the Ni-terminated interface is larger than the Al-terminated interface. The difference in charge density and the density of states show that the Ni-terminated interface is dominated by metallic bonds, and the Al-terminated Cited by: 4.

The intermetallic compound NiAl has excellent potential for high temperature structural applications but suffers from low temperature brittleness and insufficient high temperature strength.

Details NiAl and NiAl-based composites directionally solidified by a containerless zone process FB2

One way to remove these deficiencies is the reinforcement by high strength ceramic fibers. Such intermetallic matrix composites can be conveniently fabricated by the Cited by: 2. directionally solidified at 20 mm/h to produce near equilibrium microstructures. Directional solidification was performed in the containerless mode by the electromagnetically-levitated zone process [6,7].

The processed sections of these ingots were approximately 25 mm in diameter and 75 mm in length. Elevated temperature properties of the NiAI.

A high-temperature self-lubricating composite NiAl–Cr–Mo–CaF2 was fabricated using the powder metallurgy technique, and the tribological behavior of the composite at a wide range of temperatures (room temperature to °C) was investigated.

The results showed that the composite had a favorable friction coefficient of about and an excellent wear Cited by: (a) NiAlCo-lC, (b) NiAl-lCrC, (c) NiAlFe-lC, (d) NiAl-lMo-lC, and (e) NiAlW-lC 23 Figure 8: Plot of free energy of formation versus temperature for various refractory carbides [plotted from data in Table 3] 25 Figure 9: Schematic of a molten zone during directional solidification [2, 65] 29 Figure Compositions.

DEVELOPMENT OF NiAl AND NiAl-BASED COMPOSITES FOR STRUCTURAL APPLICATIONS: A STATUS REPORT Randy R. Bowman and Ronald D. Noebe 0 - - Zone x 2 - zi w - a Li - 0 ii - z % 80 - * Single Crystal Monofilament 0 I I 1 Using a modified Bridgeman process, single crystals measuring cm x cm x cm.

During the past ten years, mechanical alloying/ball milling has been employed to successfully synthesize nanocrystalline NiAl intermetallic compounds (NiAl, NiAl (Cr,Co,Ti,Fe)) and composites (NiAl-TiC, NiAl-TiB2, NiAl-HfC, NiAl-HfB2) in our group, namely, by means of self-sustained reaction.

During the mechanical alloying process, an abrupt temperature rise has Cited by: 3. NiAl composites could be a prospective way to improve the properties. Up to now, few reports about TiC−TiB2−NiAl composites and their microstructures have been publicated.

In the present work, TiC−TiB2−NiAl composites are prepared by SHS with Ti, B4C, Ni and Al as raw materials, and the effects of NiAl.

Creep, fatigue, and environmental resistance of this material are discussed. In addition, issues surrounding alloy design, development of NiAl-based composites, and Cited by:   It is commonly known that the properties of sintered materials are strongly related to technological conditions of the densification process.

This paper shows the sintering behavior of a NiAl-Al2O3 composite, and its individual components sintered separately. Each kind of material was processed via the powder metallurgy route (hot pressing).

The progress of Cited by: Nial (from "Nested Interactive Array Language") is a high-level array programming language developed from about by Mike Jenkins of Queen's University, Kingston, Ontario, s co-created the Jenkins–Traub algorithm. Nial combines a functional programming notation for arrays based on an array theory developed by Trenchard More with Typing discipline: dynamic.

Analytical solutions for beam specimens used in fracture-mechanics testing of composites and adhesively-bonded joints typically use a beam on an elastic foundation model which assumes that a non-infinite, linear-elastic stiffness exists for the beam on the elastic foundation in the region ahead of the crack tip.

Such an approach therefore assumes an Cited by: High speed cryogenic self-acting, shaft seals for liquid rocket turbopumps.

NASA Technical Reports Server (NTRS) Burcham, R. Three self acting lift pad liquid oxygen face seals and two self acting gaseous helium circumferential seals for high speed liquid oxygen turbopump were evaluated.

The development of a technology for reliable, 10 hour life, multiple. The NiAlCr-6Mo eutectic displays promising high temperature strength while still maintaining a reasonable room temperature fracture toughness when compared to other NiAl-based materials.

The Laves phase NiAlTa was used to strengthen NiAl and very promising creep strengths were found for the directionally solidified NiAl-NiAlTa eutectic. Tensile and fracture properties of NiAl/Ni micro-laminated composites prepared by reaction synthesis Hee Y.

Kim Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, DaejeonKorea Dong S. Chung Department of Materials, Daegu Polytechnic College, Seo-gu, DaeguKorea M. Metastable and unstable cellular solidification of colloidal suspensions.

NASA Astrophysics Data System (ADS) Deville, Sylvain; Maire, Eric; .The Growth of Alumina/YAG Eutectic Fibres by the Laser-Heated Floating Zone Process p Oxidation Behaviour of a SiC Based Fiber Grain Growth in Alumina Polycrystalline Fibres During NiAl/Al 2 O 3 Composite Processing p Influence of the Pyrolytic Carbon Fibre Coating on the Strength of Textron SiC Fibre in an Aluminium Matrix Cited by: 2.