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Sunday, July 26, 2020 | History

2 edition of Creep of a fully lamellar [gamma]-Tial alloy found in the catalog.

Creep of a fully lamellar [gamma]-Tial alloy

Francoise Herrouin

Creep of a fully lamellar [gamma]-Tial alloy

by Francoise Herrouin

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  • 38 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Metallurgy and Materials, Faculty of Engineering, 1999.

Statementby Francoise Herrouin.
ID Numbers
Open LibraryOL18374663M

Low cycle fatigue and creep-fatigue-environment interactions of PM/HIP Astrology were studied at C and C. Total strain range was varied from % to % at a frequency of Hz. Creep-fatigue tests were performed with 2 min. or 5 min. tensile hold times. All tests were run in high purity. The actual gamma alloy billet was approximately 63 mm diameter by mm long, and the overall fraction of lamellar (alpha-2 and gamma) structure. The heat treatments for the three microstruc­ Tensile and creep properties for the alloy in both a duplex and fully-transformed 1,

Gamma. prime _ coarsening the single crystal alloys. Al 1 creep te S in Alloy alloys exhibited pronounced, directiona tinq at °C. Figurg 4 presents the m 1 yl coarsening during. icrostructural changes B during creep at °C and MPa. After 20 hours into the. The optimized alloy--structure combination is a carbon modified Ni percent Cb percent Al percent Cr percent C composition processed under conditions producing plane front solidification and a fully-lamellar microstructure.

Start studying Dental Materials Study Questions (Book). Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. gold-based alloy ceramic. What compound has been eliminated from amalgam to improve corrosion and reduce creep? Gamma Gamma-1 Alpha- 1 Gamma . @article{osti_, title = {Microstructural Effects on Creep-Fatigue Life of Alloy }, author = {McMurtrey, Michael and Carroll, Laura and Wright, Jill}, abstractNote = {Creep-fatigue tests were performed on plates of Alloy from various heats and processing conditions, but often with inhomogeneous microstructures. After testing, metallographic analysis was performed and the .


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Creep of a fully lamellar [gamma]-Tial alloy by Francoise Herrouin Download PDF EPUB FB2

The Steady‐State or Minimum Creep Rate. Effect of Microstructure. Primary Creep. Creep‐Induced Degradation of Lamellar Structures. Precipitation Effects Associated with the α 2 →γ Phase Transformation Tertiary Creep.

Optimized Alloys, Effect of Alloy Composition and Processing. Creep Properties of Alloys with a Modulated Microstructure. Minimum creep rates as a function of stress (– MPa) and T= °C have been obtained for a Ti–48Al–2Cr–2Nb alloy with a fully lamellar ission electron microscopy (TEM) investigation reveals that the deformation structures are dominated by jogged screw 1/2[] dislocations in Cited by: A °C multi-step creep test confirmed that the EBM-built TiAl-2Cr-2Nb alloy with lower strength had lower creep resistance as well.

Microstructural observation after creep deformation confirmed that dislocation movement and mechanical twins were formed dominantly in the creep deformation of the material with the NG by: 3. Ti alloy is used for high pressure compressor disks in jet engines due to its good fatigue resistance at low and moderate temperatures.

These parts undergo complex in‐service thermo‐mechanical loading that can be simulated on laboratory samples by introducing a Author: Immanuel von Thüngen, Pierre Delaleau, Patrick Villechaise.

In addition to the fully lamellar FeAl alloy, FeAl and FeAl that included, pro-eutectoid FeAl and FeAl 2, respectively, were characterized in terms of their microstructure and creep response. For all microstructures, the strain rate as a function of time and strain exhibits a distinct minimum instead of a steady state creep by: 7.

Creep properties were investigated in a Ti49Al47Cr2Nb2 alloy produced either by cast or by wrought processing. Primary work was devoted to determine the anisotropic properties of the fully lamellar γ. In this study, a gamma TiAl-2Cr-2Nb alloy was manufactured using EBM, and its microstructure and high-temperature creep behaviors were investigated.

Conventional TiAl-2Cr-2Nb was also used. The creep behavior of a hypoeutectic Mg– mass% Ca cast alloy with an α-Mg/C14–Mg 2 Ca near-fully lamellar microstructure was investigated at K.

Transmission electron microscopy shows that dislocations are introduced within the lamellar microstructure of the alloy during casting; the dislocation segments in the α-Mg plates are located on basal planes.

The point of maximum deformation resistance (minimum creep rate) and the subsequent softening (tertiary creep) can be modelled on the basis of the tranformation of the fully lamellar structure. Creep tests were carried out on the alloy with globular and lamellar microstructure at the temperature of °C.

Primary stage of the creep process was described using various constitutive laws. The book covers commercial pure (CP) titanium, alpha + beta and beta alloys, as well as titanium based intermetallics and titanium matrix composites. Richly illustrated with more than figures, this compendium takes a conceptual approach to the physical metallurgy and applications of titanium, making it suitable as a reference and tutorial 5/5(2).

the end-product can be fully gamma or equiaxed, duplex, fully lamellar and near lamellar. gamma TiA1 alloy containing chromium and niobium. The tensile behaviour of gamma titanium. Microstructural evolution, tensile and creep behavior of TiAlNb (at.%) orthorhombic alloy with three typical microstructures were investigated.

The three typical microstructures were obtained by different solution and age treatment temperatures and analyzed by the BSE technique. The tensile strengths of the alloy at room temperature and °C were investigated. It is well understood that the standard microstructures (near-gamma, duplex, nearly lamellar, and fully lamellar) do not have the balanced mechanical properties (tensile, yield, creep and fatigue strength, ductility and fracture toughness) necessary for optimal performance in.

To enhance their creep strength, various alloying elements are added. In this work the effect of 5 at% Niobium (Nb), Tantalum (Ta) and Zirconium (Zr) on the creep properties of ternary TiAl-5X (X = Nb, Ta, Zr) with a fully lamellar microstructure, is systematically studied.

Alloy Classification. Basic Hardening Mechanisms. Hardening of the α phase. Hardening of the β phase. Basic Physical and Chemical Properties.

Diffusion. Oxidation. Corrosion Behavior. Thermomechanical Processing and Microstructure. CP Titanium. Alpha + Beta Alloys. Bi-Modal Microstructures. Fully Lamellar Microstructures. Beta Alloys. • Show greater creep strength than fully αααα Ti alloy up to oC.

• Ti-8Al-1Mo-1V and Ti-6Al-2Sn-4Zr-Mo alloys are the most commonly used. Creep constrained grain boundary cavitation in a fully lamellar (FL) form of a titanium aluminide intermetallic alloy has been studied using finite element (FE) techniques.

Two different forms of FL models were considered. Cavitation was modeled in the presence of grain boundary sliding (GBS) for the case of straight former γ grain boundaries. Gradual thickening of the lamellae appeared to be the cause of the onset of tertiary creep. At C, the fully developed lamellar structure was not achieved until the secondary or tertiary creep stages.

At this temperature, the gamma-gamma-prime lamellar structure did not appear to be as beneficial for creep resistance as at the higher temperature. @article{osti_, title = {Alloy and structural optimization of a directionally solidified lamellar eutectic alloy. [Ni% Nb 5% Al% Cr]}, author = {Sheffler, K D}, abstractNote = {Mechanical property characterization tests of a directionally solidified Ni percent Cb percent Al percent Cr cellular eutectic turbine blade alloy demonstrated excellent long time creep.

The heat treated alloy shows a fully lamellar structure within magnesium [Show full abstract] grains. In both cases, the stress dependence of the creep rate presents two different regions.include fully-lamellar microstructures, duplex material and nearly-lamellar microstructures in and improve creep resistance (increase in C and introduction of Si).

A producing gamma alloy ingots, and within the Ti-()AI range, the author has previously.Special Book Collections Abstract: The superiority of creep in Tiat%Al alloy with fully transformed lamellar structure to that in Tiat%Al alloy with γ single phase is characterized by the extension of transient stage.

This extension of the transient stage derives by the retarding effect of α2 plate on the onset of the accelerating.