Download or read book Research on Deformation and Possible Strengthening Mechanisms for Solid Solution Phases of Titanium written by Thomas R. Cass and published by . This book was released on 1969 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report is a summary of research on the growth, perfection and slip processes in pure titanium and titanium-aluminum single phase alloys. A technique was developed for the growth of titanium and dilute titanium alloy single crystals using an electron-beam zone refiner. A dislocation etchant was discovered, allowing the perfection of these crystals of 10 to the minus 9th power/sq cm. However, annealing the crystals just below the transformation temperature for long times lowers the dislocation density by two to three orders of magnitude. Compression specimens were spark-erosion machined from single crystals, annealed and mecahnically tested. A c-axis compression specimen of high purity titanium deformed by twinning. However, high interstitial content and dilute aluminum alloys both deformed by c+a glide when the load axis was near (0001). This additional deformed system accounts for the polycrystalline ductility of alpha-titanium alloys. An analysis of plastic deformation modes in TiAl was also made. Results on polycrystalline TiAl were in agreement with these predictions. However, single crystals could not be grown for definitive verification of the hypothesized modes. (Author).
Download or read book Investigations to Understand the Plastic Deformation and Strengthening Mechanisms of Solid Solution Phases of Titanium written by H. Conrad and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plastic flow and fracture of titanium are reviewed with special attention to the mechanisms which are controlling.
Download or read book Investigations to Understand the Plastic Deformation and Strengthening Mechanisms of Solid Solution Phases of Titanium written by H. Conrad and published by . This book was released on 1972 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plastic flow and fracture of titanium are reviewed with special attention to the mechanisms which are controlling.
Download or read book Investigations to Understand the Deformation and Strengthening Mechanisms of the Solid Solution Phases of Titanium written by R. L. Jones and published by . This book was released on 1968 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical properties data are reported for alpha-titanium of four impurity contents and various grain sizes, tested in the temperature range 4.2K to 800K. Dislocation substructures produced by deformation of commercial purity and high purity alpha-titanium at room temperature were examined by transmission electron microscopy and representative examples are presented and discussed. Work hardening behavior is connected with long-range interactions and is modified by both purity and grain size as well as temperature. The effect of impurity content appears to be related to the degree to which dislocations are restricted to their slip planes. Grain size also influences the yield and flow stresses, the relations observed being approximately of the Hall-Tetch type. The effects of grain size are shown to be athermal in nature and are accounted for in terms of work hardening model. Thermal activation analysis is used to show that the behavior reported is in agreement with the concept that the rate controlling process for low temperature deformation is thermally activated dislocation glide on first order prism planes over barriers associated with individual interstitial impurity atoms. The analysis shows that the nature of barriers is the same in all four materials and that the rate controlling process is unaffected by either grain size or plastic strain. (Author).
Download or read book Strengthening Mechanisms in Crystal Plasticity written by Ali Argon and published by Oxford University Press on Demand. This book was released on 2008 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technologically important metals and alloys have been strengthened throughout history by empirical means. The scientific bases of the central mechanisms of such forms of strengthening, developed over the past several decades are presented here through mechanistic models and associated experimental results.
Download or read book The Science Technology and Application of Titanium written by R. I. Jaffee and published by Elsevier. This book was released on 2013-09-24 with total page 1225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Science, Technology and Application of Titanium contains the proceedings of an International Conference organized by the Institute of Metals, The Metallurgical Society of AIME, and the American Society for Metals in association with the Japan Institute of Metals and the Academy of Sciences of the USSR and held at the Royal Festival Hall in London, on May 21-24, 1968. The papers explore scientific and technological developments as well as applications of titanium and cover topics ranging from processing of titanium to its chemical and environmental behavior, physics, thermodynamics, and kinetics. Deformation and fracture, phase transformations and heat treatment, and alloying are also discussed. This book is comprised of 114 chapters and begins with an overview of the titanium industry in Europe and the United States. The reader is then introduced to primary and secondary fabrication of titanium; corrosion and oxidation; physical properties of titanium alloys; interaction of titanium with elements of the periodic system; and elastic interactions between dislocations and twin and grain boundaries in titanium. The crystallography of deformation twinning in titanium is also examined, along with superplasticity and transformation plasticity in titanium. The remaining chapters focus on interstitial strengthening of titanium alloys; mechanism of martensitic transformation in titanium and its alloys; phase relationships in titanium-oxygen alloys; strengthening of titanium alloys by shock deformation; and titanium hot forming. This monograph will be of interest to chemists and metallurgists.
Download or read book Deformation and Solid Solution Strengthening of Titanium Aluminum Single Crystals written by N. E. Paton and published by . This book was released on 1976 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid solution strengthening and deformation behavior of titanium-aluminum single crystals has been studied over the range of temperature 77-1100K and from 0 to 6.6 w/o Al. Crystal orientations have been chosen to promote prism slip, basal slip and c+a slip, and the temperature and composition dependence of the critical resolved shear stress (CRSS) for each of these slip systems has been determined. Although prism slip has the lowest CRSS of all the slip systems studied, both increasing temperature and Al concentration make the stresses for prism and basal slip converge. Deformation with a c+a slip vector is always more difficult to activate than either basal or prism slip with an a slip vector, and this resulted in fracture of crystals oriented for c+a slip by unstable shear, under certain conditions. In addition to the work on the deformation of Ti-Al crystals in compression, some studies were conducted on both creep and cyclic deformation (fatigue) of single crystals. The impact of these studies on understanding of deformation texture development and the use of textured titanium alloys in structures is briefly discussed. (Author).
Download or read book Strengthening Mechanisms in Nickel base High temperature Alloys written by C. H. Lund and published by . This book was released on 1961 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deformation and Solid Solution Strengthening of BCC Titanium Molybdenum Alloys written by R. G. Baggerly and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deformation and strengthening of bcc Ti-Mo alloys has been investigated by examining single crystals of Ti-12-1/2 wt.% Mo. A change in deformation mode from twinning to slip occurs when single phase crystals are aged to precipitate omega phase. In the single phase solution treated condition, the crystals deform by (332) 113 twinning. When omega phase is present the crystals deform by 111 slip. The occurrence and formation of alpha phase in Ti-Mo-Al alloys has also been investigated. The relationship between Burgers and non-Burgers alpha phase is discussed with regard to mechanisms of formation and kinetics of the transformation. (Author).
Download or read book Fundamentals of Strength written by Paul Follansbee and published by Springer Nature. This book was released on 2022-07-28 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition updates and expands on the class-tested first edition text, augmenting discussion of dynamic strain aging and austenitic stainless steels and adding a section on analysis of nickel-base superalloys that shows how the mechanical threshold stress (MTS) model, an internal state variable constitutive formulation, can be used to de-convolute synergistic effects. The new edition retains a clear and rigorous presentation of the theory, mechanistic basis, and application of the MTS model. Students are introduced to critical competencies such as crystal structure, dislocations, thermodynamics of slip, dislocation–obstacle interactions, deformation kinetics, and hardening through dislocation accumulation. The model described in this volume facilitates readers’ understanding of integrated computational materials engineering (ICME), presenting context for the transition between length scales characterizing the mesoscale (mechanistic) and the macroscopic. Presenting readers a model buttressed by detailed examples and applications, the textbook is ideal for students, practitioners, and materials researchers.
Download or read book Proceedings of the 13th World Conference on Titanium written by Vasisht Venkatesh and published by John Wiley & Sons. This book was released on 2016-04-26 with total page 2004 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the Proceedings of the 13th World Conference on Titanium.
Download or read book Physics of Solid Solution Strengthening written by E. Collings and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the proceedings of a Symposium entitled "The Physics of Solid-Solution Strengthening in Alloys" which was held at McCormick Place, Chicago, on October 2, 1973, in association with a joint meeting of the American Society for Metals (ASM) and The Metallurgical Society (TMS) of the American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME). The symposium, which was initiated and organized by the editors of this volume, was sponsored by the Committee on Alloy Phases, Institute of Metals Division, TMS, AIME, and the Flow and Fracture Section of the Materials Science Division, ASM. The discipline of Alloy Design has been very active in recent years, during which considerable stress has been placed on the roles of crystallography and microstructure in the rationalization and prediction of properties. Underestimated as a component of alloy design, however, has been the importance of physical property studies, even though physical property measurements have tradi tionally been employed to augment direct or x-ray observations in the determination of phase equilibrium (and, indeed, metastable equilibrium) boundaries.
Download or read book Ni Based Superalloys written by James Coakley and published by Trans Tech Publications Ltd. This book was released on 2020-07-28 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregated Book
Download or read book Deformation and Solid Solution Strengthening of BCC Titanium Vanadium Alloys written by N. E. Paton and published by . This book was released on 1972 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the study was to investigate systematically the effects of oxygen concentration on the deformation of Ti-V alloys and to study the combined effects of the substitutional V additions and interstitial oxygen additions on the thermal and athermal components of the flow stress and on dislocation arrangements. The effect of oxygen content on the critical resolved shear stress of Ti-40 V single crystals was evaluated as a function of temperature. (Author).
Download or read book Abstracts of Active Contracts written by Air Force Materials Laboratory (U.S.). and published by . This book was released on 1968 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strength Deformation Modes and Fracture in Titanium aluminum Alloys written by M. J. Blackburn and published by . This book was released on 1969 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The variation of yield strength, deformation modes and fracture characteristics of titanium:aluminum alloys containing up to 25% aluminum were studied. This composition range includes three phase fields based on hexagonal phases, a solid solution, and ordered phase based on the composition Ti3Al and a two phase region. An attempt is made to account for the factors that control the strength and fracture characteristics of these alloys. (Author).
Download or read book Solid Solution Strengthening and Fundamental Design of Titanium Alloys written by E. W. Collins and published by . This book was released on 1972 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase stabilization and solid solution strengthening in titanium alloys are discussed from an electronic viewpoint. Based on the structure dependence of cohesive energy, we rationalize the alpha and beta-stabilization of titanium as produced by alloying with nontransition and transition metals, respectively; and point out that only the addition of alpha-stabilizers will yield significant strengthening effect. The preference of multicomponent alloying, i.e., adding several nontransition metal solutes to titanium or otherwise beta-stabilized alloys, can also be justified from the concept to be described. Correlations between physical and mechanical properties of prototype systems (Ti-Al, Ti-Ga, Ti-Sn, Ti-Al-Ga, Ti-Mo, and Ti-Mo-Fe-Al) are presented to demonstrate the validity of the fundamental approach, which should eventually develop into useful alloy design criteria.
