Download or read book Deformation and Fracture of an Ultra large Grain Near Alpha Titanium Alloy written by Richard James Wilson and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deformation and Fracture of an Ultra large Grain Near Alpha Titanium Alloy written by Richard James Wilson and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Plastic Deformation and Fracture in Alpha Titanium written by M. F. Amateau and published by . This book was released on 1966 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crack initiation and propagation behavior was studied in unalloyed titanium containing between 0.25 and 0.6% oxygen and in Ti-5Al-2.5Sn alloy containing between 0.07 and 0.37% oxygen. Large-grained tensile specimens were tested at -320 F and metallographically examined to identify the mechanism of microcrack formation. Precracked single edge notched specimens were tested at -320 F in order to relate crack propagation events to fracture energy and grain orientation. Second order twin induced microcracking, which is responsible for brittle behavior in unalloyed titanium at 0.25% oxygen, becomes restricted at 0.5 and 0.6% oxygen. In Ti-5Al-2.5Sn alloy containing 0.3% oxygen, slip induced microcracks form in addition to twin induced microcracks. A general correlation was found between fracture energy, grain orientation and crack propagation events in unalloyed titanium containing 0.25 to 0.6% oxygen. (Author).

Download or read book A Study of Microstructure Tensile Deformation Cyclic Fatigue and Final Fracture Behavior of Commercially Pure Titanium and a Titanium Alloy written by Udaykar Bathini and published by . This book was released on 2010 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid industrial growth and advances in the domains of engineering and related technologies during the last fifty years have led to the extensive use of traditional metals and their alloy counterparts. Titanium is one such metal which has gained wide popularity in the aerospace and defense related applications owing to a wide range of impressive mechanical properties like excellent specific strength ([sigma]UTS/[rho]), stiffness, corrosion and erosion resistance, fracture toughness and capability to withstand significant temperature variations. Two materials, namely commercial purity titanium (Grade 2), referred to henceforth as Ti-CP (Grade 2) and the "work-horse" alloy Ti-6Al-4V have been chosen for this research study. The intrinsic influence of material composition and test specimen orientation on the tensile and fatigue behavior for both Ti-CP (Grade 2) and Ti-6Al-4V have been discussed. Samples of both Ti-CP (Grade 2) and Ti-6Al-4V were prepared from the as-provided plate stock along both the longitudinal and transverse orientations. The specimens were then deformed to failure in uniaxial tension for the tensile tests and cyclically deformed at different values of maximum stress at constant load ratio of 0.1 for the high cycle fatigue tests. The microstructure, tensile properties, resultant fracture behavior of the two materials is presented in the light of results obtained from the uniaxial tensile tests. The conjoint influence of intrinsic microstructural features, nature of loading and specimen properties on the tensile properties is discussed. Also, the macroscopic fracture mode, the intrinsic features on the fatigue fracture surface and the role of applied stress-microstructural feature interactions in governing failure for the cyclic fatigue properties for both the materials under study Ti-CP (Grade 2) and the "work-horse" alloy Ti-6Al-4V have been discussed in detail. Careful study of the microstructure for Ti-CP (Grade 2) material at a low magnification revealed the primary alpha grains to be intermingled with small pockets of beta grains. Observation at the higher allowable magnifications of the optical microscope revealed very fine alpha phase lamellae located within the beta grain. The microhardness and macrohardness measurements were consistent through the sheet specimen for Ti-CP (Grade 2) and slightly lower compared to Ti-6Al-4V. However, the macrohardness was marginally higher than the microhardness resulting from the presence of a large volume fraction of the soft alpha phase. The hardness values when plotted reveal marginal spatial variability. Tensile fracture of Ti-CP (Grade 2) was at an inclination to the far field tensile stress axis for both longitudinal and transverse orientations. The overload region revealed a combination of fine microscopic cracks, microscopic voids of varying size and randomly distributed through the surface, and a large population of shallow dimples, features reminiscent of locally brittle and ductile failure mechanisms. The maximum stress ([sigma]maximum) versus fatigue life (Nf) characteristics shown by this material is quite different from those non-ferrous metals that exhibit a well-defined endurance limit. When compared at equal values of maximum stress at a load ratio of 0.1, the fatigue life of the transverse specimen is noticeably greater than the longitudinal counterpart. At equivalent values of maximum elastic strain, the transverse specimens revealed noticeably improved fatigue life as compared one-on-one to the longitudinal counterparts. Careful observations of the Ti-6Al-4V alloy microstructure over a range of magnifications spanning very low to high magnification revealed a duplex microstructure consisting of the near equiaxed alpha and transformed beta phases. The primary near equiaxed shaped alpha grains (light in color) was well distributed in a lamellar matrix with transformed beta (dark in color). The microhardness and macrohardness values recorded for the Ti-6Al-4V alloy reveal it to be harder than the commercially pure (Grade 2) material. However, for the Ti-6Al-4V alloy the microhardness is noticeably higher than the corresponding macrohardness value that can be ascribed to the presence of a population of processing-related artifacts and the hard beta-phase. Tensile fracture of the Ti-6Al-4V alloy was macroscopically rough and essentially normal to the far field stress axis for the longitudinal orientation and cup-and-cone morphology for the transverse orientation. However, microscopically, the surface was rough and covered with a population of macroscopic and fine microscopic cracks, voids of varying size, a population of shallow dimples of varying size and shape, features reminiscent of locally brittle and ductile failure mechanisms. When compared at equal values of maximum stress at a load ratio of 0.1, there is a marginal to no influence of microstructure on high cycle fatigue life of both orientations of the alloy.

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 4024 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 Recrystallization and Related Annealing Phenomena written by F.J. Humphreys and published by Elsevier. This book was released on 2012-12-02 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: The annealing of deformed materials is of both technological importance and scientific interest. The phenomena have been most widely studied in metals, although they occur in all crystalline materials such as the natural deformation of rocks and the processing of technical ceramics. Research is mainly driven by the requirements of industry, and where appropriate, the book discusses the extent to which we are able to formulate quantitative, physically-based models which can be applied to metal-forming processes.The subjects treated in this book are all active research areas, and form a major part of at least four regular international conference series. However, there have only been two monographs published in recent times on the subject of recrystallization, the latest nearly 20 years ago. Since that time, considerable advances have been made, both in our understanding of the subject and in the techniques available to the researcher.The book covers recovery, recrystallization and grain growth in depth including specific chapters on ordered materials, two-phase alloys, annealing textures and annealing during and after hot working. Also contained are treatments of the deformed state and the structure and mobility of grain boundaries, technologically important examples and a chapter on computer simulation and modelling. The book provides a scientific treatment of the subject for researchers or students in Materials Science, Metallurgy and related disciplines, who require a more detailed coverage than is found in textbooks on physical metallurgy, and a more coherent treatment than will be found in the many conference proceedings and review articles.

Download or read book Corrosion of Titanium written by J. D. Jackson and published by . This book was released on 1966 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deformation and Fracture of P M Powder Metallurgy Titanium Alloys written by D. A. Koss and published by . This book was released on 1984 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress is reviewed for a research program whose purpose is to provide a broad-based understanding of the application and consequences of certain advanced processing techniques to high performance alloys in general and to Ti alloys in particular. The research ranges from experimental studies of hot isostatic pressing (HIP) to experimental/analytical modeling of the deformation and fracture of materials with pre-existing porosity. Aspects of the search are also a fundamental study of fracture utilizing engineering materials containing processing-induced defects. Progress for the period October 1, 1983 to September 30, 1984 is reviewed for the following portions of this research program: (1) the influence of porosity on the deformation and fracture of alloys over a wide range of strain rates; (2) the effects of void/pore distributions on ductile fracture as modeled by arrays of holes; (3) hot isostatic pressing of metallic powders; and (4) grain size/stress state effects on the hydrogen embrittlement of titanium. (Author).

Download or read book Titanium Alloys written by Jan Sieniawski and published by BoD – Books on Demand. This book was released on 2013-05-15 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book contains six chapters and covers topics dealing with biomedical applications of titanium alloys, surface treatment, relationships between microstructure and mechanical and technological properties, and the effect of radiation on the structure of the titanium alloys.

Download or read book Deformation Study of the Novel Alpha beta Titanium Alloy Ti 407 written by Zachary Thomas Kloenne and published by . This book was released on 2020 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium and its alloys are very important to the advancement of aviation technology, as the strength-to-weight ratio of these alloys make them ideal for increased efficiency. Historically, alpha/beta titanium alloys have been used in the low temperature, low pressure region of a turbine engine, with Ti-6Al-4V being the most commonly used alloy, often referred to as the "workhorse" titanium alloy. However, Ti-6Al-4V experiences limitations in ductility, low-temperature machinability, fracture toughness, and perhaps most importantly, cost. To address these issues, alloy development was performed at TIMET corporation, with a focus on a low-Al containing alloy. A series of alloys were produced, with high strain rate mechanical response serving as a barometer for desired properties. Using this method, the alloy TIMETAL-407, referred to as Ti-407 henceforth, was developed, with an nominal composition of: Ti-0.85Al-3.85V, 0.25Fe-0.25Si-0.15O (wt.%), with the remaining balanced by titanium. Ti-407 displayed remarkable high strain rate properties, lending toward applications requiring increased resistance to impact loading. In addition to improved energy absorption properties, the low alloying content offers cost benefits when compared with its counterpart alloys, namely Ti-6Al-4V and Ti-3Al-2.5V. While enhanced properties in Ti-407 were observed in both high strain rate and nominal strain rate testing, the source of these properties remained unidentified. This work attempted to elucidate the bases for improved mechanical response in Ti-407. This has been achieved through a series of mechanical tests, followed by advanced characterization of deformed specimens. Additional insight was gained through through comparison of deformation mechanisms in Ti-407 with Ti-6Al-4V and Ti-3Al-2.5V, which provided information on opposed mechanisms. The results uncovered in this study have revealed a number of novel mechanisms related to the deformation of Ti-407, which included anomalous c+a dislocation activity in grains oriented favorably for a-type prismatic slip, reduced localization of slip, increased propensity for a-type pyramidal slip, and deformation through sliding at the alpha/beta interfaces. Reduction in slip localization has been attributed to the low Al content of Ti-407, while the source of interface sliding and c+a dislocation activity has been attributed to a segregation of Si to the alpha/beta interface, which results in a distortion to the alpha/beta interface, locally. The distortion has been determined to affect the habit plane of the alpha/beta interface.

Download or read book Tensile Properties to 650 C and Deformation Structures in a Precipitation strengthened Titanium aluminum Alloy written by Madan G. Mendiratta and published by . This book was released on 1973 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Appreciable strength levels were retained to 650 C in a Ti-10Al-1Si alloy aged in the (alpha alpha sub 2) phase field to yield optimum room temperature strength and ductility. The aging treatment precipitated a uniform distribution of alpha sub 2-particles such that, at room temperature, dislocations bypassed instead of shearing the particles at low strains. Specimens fractured at room temperature exhibited fine uniform dimples even for those aging conditions that imparted no macroscopic ductility. The main crack appeared to propagate through the planar slip bands that had cut through the alpha sub 2-particles. A two-step aging process produced a higher volume fraction of bimodally distributed alpha sub 2-particles that led to higher strength levels at elevated temperatures. Both for the single size and the bimodal alpha sub 2-particle distributions, elevated-temperature deformation structures consisted mainly of planar slip bands that sheared through the alpha sub 2-particles.

Download or read book Toughness and Fracture Behavior of Titanium written by and published by ASTM International. This book was released on 1978 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Titanium Alloys written by Maciej Motyka and published by BoD – Books on Demand. This book was released on 2019-11-27 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium alloys, due to unique physical and chemical properties (mainly high relative strength combined with very good corrosion resistance), are considered as an important structural metallic material used in hi-tech industries (e.g. aerospace, space technology). This book provides information on new manufacturing and processing methods of single- and two-phase titanium alloys. The eight chapters of this book are distributed over four sections. The first section (Introduction) indicates the main factors determining application areas of titanium and its alloys. The second section (Manufacturing, two chapters) concerns modern production methods for titanium and its alloys. The third section (Thermomechanical and surface treatment, three chapters) covers problems of thermomechanical processing and surface treatment used for single- and two-phase titanium alloys. The fourth section (Machining, two chapters) describes the recent results of high speed machining of Ti-6Al-4V alloy and the possibility of application of sustainable machining for titanium alloys.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hot Deformation of Near alpha Titanium Alloy IMI685 written by Yuesheng Liu and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Titanium and Titanium Alloys written by Christoph Leyens and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is an excellent reference for materials scientists and engineers needing to gain more knowledge about these engineering materials. Following introductory chapters on the fundamental materials properties of titanium, readers will find comprehensive descriptions of the development, processing and properties of modern titanium alloys. There then follows detailed discussion of the applications of titanium and its alloys in aerospace, medicine, energy and automotive technology.

Download or read book A Study of Tensile Deformation Fracture Characteristics and Beta Brittleness in Alpha beta Titanium Alloy written by Kaiyan Jiang and published by . This book was released on 1985 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: