Influence of Microstructure and Orientation Relationships on the Mechanisms of Plastic Deformation of a Two-phase Ti-47.5Al-2.5Cr Alloy PDF Download
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Author: Jeffrey W. Luster
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
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Book Description
Author: Jeffrey W. Luster
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
Get Book Here
Book Description
Author: Jeffrey W. Luster
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
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Book Description
![The Influence of Severe Plastic Deformation on Phase Transformations, Microstructure and Mechanical Properties in Metastable [beta]-Ti-Nb and [beta]-Ti-Nb-Pd Alloys PDF](https://books.google.com/books/content/images/frontcover/LDb3zQEACAAJ?fife=w80-h100)
Author: Paweł Żywicki
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Marcello Cabibbo
Publisher: BoD – Books on Demand
ISBN: 9535134256
Category : Science
Languages : en
Pages : 228
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Book Description
Grain size is recognized as a key microstructural factor affecting mechanical and, to some extent, physical properties of metals and metallic materials. For this reason, all the means designed to control and modify the grain size are considered a proper way to design and tailor metallic materials with desired properties. In this sense, microstructure refinement through severe plastic deformation (SPD) techniques can be considered a key method for this purpose. A typical SPD process is currently defined as any method of metal forming under extensive hydrostatic pressure intended to impose a very high strain on a bulk solid without involving any significant change in the overall dimensions and having the ability to produce exceptional grain refinement. What makes SPD processing techniques so popular and attractive is the possibility of using them to enhance the strength behavior of conventional metallic materials by a factor of up to eight for pure metals such as copper and by some 30-50% for alloys. Despite the impressive property improvement achievable with SPD techniques, their uptake by industry has been rather sluggish. This book intends to give a panorama of the typical SPD techniques intended to optimize the mechanical and physical properties of metals through a significant grain size reduction process. Modeling for this purpose is also presented.
Author: T. W. Clyne
Publisher: Cambridge University Press
ISBN: 1108950299
Category : Technology & Engineering
Languages : en
Pages : 298
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Book Description
Discover a novel, self-contained approach to an important technical area, providing both theoretical background and practical details. Coverage includes mechanics and physical metallurgy, as well as study of both established and novel procedures such as indentation plastometry. Numerical simulation (FEM modelling) is explored thoroughly, and issues of scale are discussed in depth. Discusses procedures designed to explore plasticity under various conditions, and relates sample responses to deformation mechanisms, including microstructural effects. Features references throughout to industrial processing and component usage conditions, to a wide range of metallic alloys, and to effects of residual stresses, anisotropy and inhomogeneity within samples. A perfect tool for materials scientists, engineers and researchers involved in mechanical testing (of metals), and those involved in the development of novel materials and components.
Author: Kyung-mox Cho
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
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Book Description
![Some Aspects of the Plastic Deformation of Phase Mixtures with Coarse Microstructures. [Two-phase Alloys]. PDF](https://books.google.com/books/content/images/frontcover/neW6wgEACAAJ?fife=w80-h100)
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
This paper discusses plastic deformation of two-phase alloys, the partititon of stress and strain between the soft and hard constituents, and the applicability of mixture laws. Dual-phase steels are considered in particular. At all strains, plastic deformation takes place mainly in the ferrite. The martensite resists plastic deformation at low strain but is ductile. The martensite particles supplies the desirable dispersion hardening effect, enhanced strain hardening rate and resistance to plastic instability such as necking, while yielding plastically at high strains. 12 figures. (DLC).
Author: Mikha]ıl A Lebyodkin
Publisher:
ISBN: 9783036515618
Category :
Languages : en
Pages : 210
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Book Description
The last few decades have seen considerable progress in the development of high-performance metals and alloys that have microstructures and plastic behaviors with a high level of complexity. Ultrafine-grain materials, metallic glasses, gradient microstructures, etc., have clearly been gaining the attention of researchers and are gaining a place in the industry. Concurrently, the self-organized nature of plastic deformation, leading to complex behaviors on mesoscopic scales even in pure metals with highly symmetric lattices, has been generally recognized. Such progress has demanded the development of sophisticated experimental techniques (in situ TEM, digital image correlation, nano-indentation, etc.), advanced multiscale modeling (molecular dynamics, discrete dislocation dynamics, strain gradient models, etc.), and methods of analysis of the observed and simulated behaviors from the viewpoint of self-organization, with an aim of filling gaps between the elementary atomic-scale mechanisms and the scale of a laboratory sample. The current research has evolved in two main areas. First, new approaches to old questions and traditional model materials allow for a deeper understanding of physical mechanisms. Second, a better understanding of the process-microstructure-property links provides a basis for the elaboration of new materials and processing routes, as well as for the creation of powerful computer models that are able to predict the behavior of complex materials. This Special Issue aims at presenting examples of such recent progress and trends in the plasticity of metals and alloys.
Author: Guney Guven Yapici
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The present work aims to reveal the microstructural evolution and post-processing mechanical behavior of difficult-to-work alloys upon severe plastic deformation. Severe plastic deformation is applied using equal channel angular extrusion (ECAE) where billets are pressed through a 90° corner die achieving simple shear deformation. Three different materials are studied in this research, namely Ti-6Al-4V, Ti-6Al-4V reinforced with 10% TiC and AISI 316L stainless steel. Microstructure and mechanical properties of successfully extruded billets were reported using light microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), tension and compression experiments and microhardness measurements. The effects of extrusion conditions (temperature and processing route) on the microstructure and mechanical properties are investigated. The underlying mechanisms responsible for observed mechanical behaviors are explored. It is seen that ECAE shear deformation leads to refinement in ł plates and elimination of prior [beta] boundaries in Ti-6Al-4V. Decreasing extrusion temperature and increasing number of passes decreases [alpha] plate size and grain size. Refined [alpha] grain size leads to a significant increase in tensile and compressive flow stresses at room temperature. Texture produced by ECAE has a pronounced effect on mechanical properties. Specifically it leads to tension/compression asymmetry in flow strengths and strain hardening coefficients may be described by the activation of differing slip systems under tension and compression loading. ECAE of Ti-6Al-4V+10%TiC samples also improved mechanical properties due to ł plate size refinement. Nevertheless, further extrusion passes should be carried out for tailoring reinforcement size and distribution providing optimum strength and ductility. ECAE deformation of AISI 316L stainless steel at high homologous temperatures (0.55 to 0.60 T[subscript]m) results in deformation twinning as an effective deformation mechanism which is attributed to the effect of the high stress levels on the partial dislocation separation. Deformation twinning gives rise to high stress levels during post-processing room temperature tension and compression experiments by providing additional barriers to dislocation motion and decreasing the mean free path of dislocations. The highest tensile flow stress observed in the sample processed at 700°C following one pass route A was on the order of 1200 MPa which is very high for 316L stainless steel. The ultimate goal of this study is to produce stabilized end microstructures with improved mechanical properties and demonstrate the applicability of ECAE on difficult-to-work alloys.
Author: Hugh Bernard McLean
Publisher:
ISBN:
Category :
Languages : en
Pages : 158
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Book Description
