Oxide Dispersion Strengthened Alloys
Author: Nicholas John Grant
Publisher:
Published: 1967
Total Pages: 44
ISBN-13:
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Author: Nicholas John Grant
Publisher:
Published: 1967
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOKAuthor: G. Mervin Ault
Publisher:
Published: 1966
Total Pages: 112
ISBN-13:
DOWNLOAD EBOOKAuthor: Anshuman Patra
Publisher:
Published: 2022
Total Pages:
ISBN-13: 9781032061665
DOWNLOAD EBOOK"Refractory metals such as W, Mo, Ta, Nb, Re have immense potential for application in plasma facing material in nuclear reactors, defense materials, aviation counterweights, heating elements in furnaces, and so forth. This book presents a wide perspective of oxide dispersion strengthened refractory alloys fabrication and critical properties. It provides a comprehensive road map for an appropriate basis for alloy design, process parameter selection, fabrication route, and deformation behavior for oxide dispersion strengthened refractory alloys. It further covers achievement of application-oriented properties and critical process regulating parameters for development of sustainable materials. Features: covers development of oxide dispersion strengthened sustainable material to withstand high temperature environment, describes stimulating application oriented final mechanical properties, illustrates fabrication of alloys through effective route to achieve desired properties, presents in-depth comprehension of deformation behavior at ambient and high temperature, and explores critical applications of the alloys in nuclear reactors, defense, and aviation sectors. This book is geared towards graduate students and researchers in in high temperature materials, mechanics, metallurgy, powder metallurgy, and physical metallurgy"--
Author: Yei-Wei Magnus Lou
Publisher:
Published: 1984
Total Pages: 318
ISBN-13:
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Publisher:
Published: 2015
Total Pages:
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DOWNLOAD EBOOKAuthor: Facundo Rolf Morral
Publisher:
Published: 1977
Total Pages: 214
ISBN-13:
DOWNLOAD EBOOKAuthor: Richard J. Murphy
Publisher:
Published: 1964
Total Pages: 38
ISBN-13:
DOWNLOAD EBOOKIn an effort to produce dispersion-strengthened alloys with more versatile strength properties than those reported for oxide dispersion strengthened systems, the systems Ni-TiC and Ni-TiB2 were studied. Diffusion couples of dilute alloys of Ni-C and Ni-Ti as well as of Ni-B and Ni-Ti were studied to determine the conditions necessary for the formation of a fine dispersion of TiC and TiB2 in nickel. TiB2 was found to be unsuitable for this type of application. Nickel-base alloys with a dispersion of TiC were prepared by several powder metallurgical techniques as well as by internal carburization of Ni-Ti chips. The mechanical properties of these alloys were studied at room temperature and 815C and a comparison made with the properties of conventional alloys reported for these temperatures. Transmission electron microscopy was used to study the elastic strain fields associated with dispersoid particles in the Ni-Al2O3 and Cu-Al2O3 systems, prepared by internal oxidation. (Author).
Author: Shojiro Ochiai
Publisher: CRC Press
Published: 1993-12-17
Total Pages: 832
ISBN-13: 9780824791162
DOWNLOAD EBOOKProvides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
Author: He, Pei
Publisher: KIT Scientific Publishing
Published: 2013-12-24
Total Pages: 236
ISBN-13: 3731501414
DOWNLOAD EBOOKMain objective of this work is to develop, by systematic variation of the chemical composition, and TMP, 14% Cr nano-structured ferritic alloys with significantly improved high-temperature properties compared to currently available ODS alloys. Application of state-of-the-art characterization tools shall lead to an integrated understanding of structure-property correlation and the formation mechanism of nanoparticles.
Author: Martin Owusu-Mensah
Publisher:
Published: 2019
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKOxide Dispersion Strengthened (ODS) steels, that is steels reinforced with a homogeneous distribution of (Y,Ti) oxide nano-particles, are advanced structural materials for nuclear applications. The oxide particles serve as point defect recombination centres and obstacles to dislocation motion thereby improving radiation resistance and high-temperature strength of these steels making them perfect candidate materials for future fusion and fission nuclear reactors. The conventional fabrication of ODS steels is achieved by mechanical alloying followed by thermomechanical heat treatments. This way of ODS steel production seems complicated to understand the physical mechanisms leading to the precipitation of nano-oxide particles. The kinetics of nanoparticle formation can be much better studied using an alternative technique of nanoparticle growth, namely Ion Beam Synthesis (IBS). This approach has many advantages including the precise control of experimental parameters and the ability to de-correlate various factors contributing to precipitation kinetics. A better knowledge gained in this way would be potentially helpful for optimization of ODS steel production routines. In the course of this PhD study, the IBS approach was applied to investigate the co-precipitation of metal (Y and/or Ti) and oxygen ions implanted into a model Fe-Cr alloy with the composition close to those typical for commercial ODS steels. Following the standard IBS schedule, consisting of ion implantation followed by high-temperature heat treatment, ions of Y, Ti and O at low energies were implanted into high-purity Fe10wt%Cr alloy samples at room temperature. The implanted samples were then annealed at various temperatures ranging from 600 to 1100°C to promote the precipitation of nano-oxide particles. A range of Transmission Electron Microscopy techniques were used to characterize the crystallographic structure and chemical composition of the nanoparticles. The study has been performed following three sets of experiments. First of all, the sequential implantation of Ti and O ions was implemented. Subsequent annealing at temperatures below 1000°C revealed that precipitation of titanium oxide was suppressed. Instead, chromium-rich nano-oxide particles with corundum hexagonal structure were found to precipitate. At sufficiently high temperatures these corundum particles were found to contain certain amount of Ti. Only after annealing at the highest temperature of 1100°C, particles of another type with Ti enriched core and Cr enriched shell were additionally fixed. Secondly, sequential Y and O ion implantation resulted in the formation of probable yttrium-rich oxides at 800°C. Annealing at 1100°C promoted their growth to larger sized yttria (Y2O3) particles with a Cr enriched shell. Finally, sequential ion implantation of both metal ions (Y and Ti) was performed, followed by O implantation. The order of metal ion implantation has been found to be crucial for subsequent oxide precipitation at the annealing stage. With the Ti implantation first in the sequence, the precipitation of corundum hexagonal chromium-rich oxide was observed, very similar to the case of Ti and O implantation. In contrast, implantation starting with Y produced yttrium-titanium oxide particles with unidentifiable structure. Summing up, the study has demonstrated the feasibility of the formation of Y, Ti and (Y,Ti) oxides by ion implantation. The thesis presents the detailed characterization of the nanoparticles, as well as the discovered specific features of precipitated particles, such as the presence of orientation relationships between the particles and the FeCr matrix, which was observed even for the case of Cr-rich corundum particles. Finally, the implications of the obtained results, in conjunction with the already known data from the existing literature, for the better understanding of the mechanisms involved in the formation of nano-oxide particles in ODS steels are discussed.