Mechanical Properties Optimization Via Microstructural Control of a Metastable [beta]-type Ti-Nb Based Gum Metal PDF Download
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Author: Sumin Shin
Publisher:
ISBN:
Category :
Languages : en
Pages : 195
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Book Description
Metastable [beta] titanium alloys are essential materials for biomaterials and aerospace applications. It is well known that their properties can be manipulated by tailoring the [beta] phase stability and/or microstructural design, which not only results in the activation of multiple deformation mechanisms but also leads to non-homogeneous plastic deformation. Aiming at an improved understanding of the deformation mechanisms associated with the [beta] phase stability, especially the effects of elemental distributions on the deformation mechanisms, three groups of Ti-23Nb-0.8Ta-2Zr-O (at%) alloys with varied [beta] phase stability were produced, which correspond to the occurrence of stress induced [alpha]" martensite transformation, mechanical twinning and slip dislocation, respectively. The [beta]-phase stability dependence of deformation features can explain the possibility of manipulating the mechanical properties without the evident elastic properties. In twin-dominated metal, the prevailed deformation mechanism is found to be modified into multiple twinning systems based on the dependence of crystallographic orientation. Twinned structure mainly composed of {332}112 twin system is proposed to account for the Twin-Induced Plasticity (TWIP) effect. Thermomechanical-cycling processes are systemically applied to control a volume fraction of mechanical twins. The dissociation residual stress and passage of {332}113[beta] twin can render multiple mechanical twins form into the [beta]-phase matrix and thus induce a softening effect for enhancing uniform ductility of Ti-Nb Gum metal, attributed to well-distributed twins throughout the entire microstructure based on the 'composite effect'. Lastly, this paper reports on a heterogeneous-structured [beta]-Ti alloy with an exceptional combination of high strength and ductility, resulting from optimized hierarchical features in a lamellar microstructure. The microstructure is achieved by controlling a fraction of coarse/fine domains, spatial grain-size distribution, and different types of grain boundaries. The large degree of microstructural heterogeneity leads to obvious mechanical incompatibility and strain partitioning during plastic deformation. These experimental results demonstrate that the microstructure design can be undertaken to open new possibilities to expand the material property window between the relatively low Young's modulus related to chemical composition optimization and better formability linked to improved ductility and enhanced strain hardening.
![Mechanical Properties Optimization Via Microstructural Control of a Metastable [beta]-type Ti-Nb Based Gum Metal PDF](https://books.google.com/books/content/images/frontcover/vOsgygEACAAJ?fife=w80-h100)
Author: Sumin Shin
Publisher:
ISBN:
Category :
Languages : en
Pages : 195
Get Book Here
Book Description
Metastable [beta] titanium alloys are essential materials for biomaterials and aerospace applications. It is well known that their properties can be manipulated by tailoring the [beta] phase stability and/or microstructural design, which not only results in the activation of multiple deformation mechanisms but also leads to non-homogeneous plastic deformation. Aiming at an improved understanding of the deformation mechanisms associated with the [beta] phase stability, especially the effects of elemental distributions on the deformation mechanisms, three groups of Ti-23Nb-0.8Ta-2Zr-O (at%) alloys with varied [beta] phase stability were produced, which correspond to the occurrence of stress induced [alpha]" martensite transformation, mechanical twinning and slip dislocation, respectively. The [beta]-phase stability dependence of deformation features can explain the possibility of manipulating the mechanical properties without the evident elastic properties. In twin-dominated metal, the prevailed deformation mechanism is found to be modified into multiple twinning systems based on the dependence of crystallographic orientation. Twinned structure mainly composed of {332}112 twin system is proposed to account for the Twin-Induced Plasticity (TWIP) effect. Thermomechanical-cycling processes are systemically applied to control a volume fraction of mechanical twins. The dissociation residual stress and passage of {332}113[beta] twin can render multiple mechanical twins form into the [beta]-phase matrix and thus induce a softening effect for enhancing uniform ductility of Ti-Nb Gum metal, attributed to well-distributed twins throughout the entire microstructure based on the 'composite effect'. Lastly, this paper reports on a heterogeneous-structured [beta]-Ti alloy with an exceptional combination of high strength and ductility, resulting from optimized hierarchical features in a lamellar microstructure. The microstructure is achieved by controlling a fraction of coarse/fine domains, spatial grain-size distribution, and different types of grain boundaries. The large degree of microstructural heterogeneity leads to obvious mechanical incompatibility and strain partitioning during plastic deformation. These experimental results demonstrate that the microstructure design can be undertaken to open new possibilities to expand the material property window between the relatively low Young's modulus related to chemical composition optimization and better formability linked to improved ductility and enhanced strain hardening.
Author: Manoj Gupta
Publisher: Springer
ISBN: 9812873724
Category : Technology & Engineering
Languages : en
Pages : 119
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Book Description
This book critically summarizes the effects of various suitable alloying elements and particulate reinforcements on mechanical and degradation properties of pure Mg and Mg alloys targeting biomedical applications. The suitability of alloying elements and particulate reinforcements are discussed based on their levels of toxic effects on human body. First attempt is made to study and discuss on the various available synthesizing techniques for fabrication of both impermeable and porous Mg materials. Further, more emphasis on development of new magnesium matrix nanocomposites (MMNC) is made owing to the similarities between natural bone and MMNCs as bio-“nanocomposite”. The information on synthesis, toxicity of alloying elements and reinforcements and their effects on mechanical and degradation properties of pure Mg will enable the researchers to effectively design Mg alloys and composites targeting biomedical applications.
Author: Hee Young Kim
Publisher: Butterworth-Heinemann
ISBN: 0128093846
Category : Technology & Engineering
Languages : en
Pages : 222
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Book Description
Ni-free Ti-based Shape Memory Alloys reviews the fundamental issues of biomedical beta-type Ti base shape memory and superelastic alloys, including martensitic transformation, shape memory and superelastic properties, alloy development, thermomechanical treatment and microstructure control, and biocompatibility. Some unique properties, such as large nonlinear elastic behavior and low Young's modulus, observed in metastable Ti alloys are discussed on the basis of phase stability. As it is expected that superelastic Ti alloys will further expand the applications of shape memory alloys within the biomedical field, this book provides a comprehensive review of these new findings in Ti-base shape memory and superelastic alloys. - Includes coverage of phase transformations in titanium alloys - Discusses mechanical properties and alloy development - Presents a review of Ti-based shape alloys and their applications
Author: K Yamauchi
Publisher: Elsevier
ISBN: 0857092626
Category : Technology & Engineering
Languages : en
Pages : 225
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Book Description
Shape memory and superelastic alloys possess properties not present in ordinary metals meaning that they can be used for a variety of applications. Shape memory and superelastic alloys: Applications and technologies explores these applications discussing their key features and commercial performance. Readers will gain invaluable information and insight into the current and potential future applications of shape memory alloys.Part one covers the properties and processing of shape memory effect and superelasticity in alloys for practical users with chapters covering the basic characteristics of Ti-Ni-based and Ti-Nb-based shape memory and superelastic (SM/SE) alloys, the development and commercialisation of TiNi and Cu-based alloys, industrial processing and device elements, design of SMA coil springs for actuators before a final overview on the development of SM and SE applications. Part two introduces SMA application technologies with chapters investigating SMAs in electrical applications, hot-water supply, construction and housing, automobiles and railways and aerospace engineering before looking at the properties, processing and applications of Ferrous (Fe)-based SMAs. Part three focuses on the applications of superelastic alloys and explores their functions in the medical, telecommunications, clothing, sports and leisure industries. The appendix briefly describes the history and activity of the Association of Shape Memory Alloys (ASMA).With its distinguished editors and team of expert contributors, Shape memory and superelastic alloys: Applications and technologies is be a valuable reference tool for metallurgists as well as for designers, engineers and students involved in one of the many industries in which shape memory effect and superelasticity are used such as construction, automotive, medical, aerospace, telecommunications, water/heating, clothing, sports and leisure. - Explores important applications of shape memory and superelastic alloys discussing their key features and commercial performance - Assesses the properties and processing of shape memory effect and superelasticity in alloys for practical users with chapters covering the basic characteristics - Introduces SMA application technologies investigating SMAs in electrical applications, hot-water supply, construction and housing, automobiles and railways and aerospace engineering
Author: Ilya Okulov
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Francis Froes
Publisher: Woodhead Publishing
ISBN: 0128124571
Category : Technology & Engineering
Languages : en
Pages : 656
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Book Description
Titanium in Medical and Dental Applications is an essential reference book for those involved in biomedical materials and advanced metals. Written by well-known experts in the field, it covers a broad array of titanium uses, including implants, instruments, devices, the manufacturing processes used to create them, their properties, corrosion resistance and various fabrication approaches. Biomedical titanium materials are a critically important part of biomaterials, especially in cases where non-metallic biomedical materials are not suited to applications, such as the case of load-bearing implants. The book also covers the use of titanium for implants in the medical and dental fields and reviews the use of titanium for medical instruments and devices. - Provides an understanding of the essential and broad applications of Titanium in both the medical and dental industries - Discusses the pathways to manufacturing titanium into critical biomedical and dental devices - Includes insights into further applications within the industry
Author: Carlos Garcia-Mateo
Publisher: MDPI
ISBN: 3039288571
Category : Technology & Engineering
Languages : en
Pages : 166
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Book Description
The microstructures of both martensite and bainite, although sharing some common features, depict a plethora of subtle differences that made them unique when studied in further detail. Tailoring the final properties of a microstructure based on one or the other as well as in combination with others and exploring more sophisticated concepts, such as Q&P and nanostructured bainite, are the topics which are the focus of research around the world. In understanding the key microstructural parameters controlling the final properties as well as definition of adequate process parameters to attain the desired microstructures requires that a proper understanding of the mechanism ruling their transformation and a detailed characterization first be acheived. The development of new and powerful scientific techniques and equipment (EBSD, APT, HRTEM, etc.) allow us to gain fundamental insights that help to establish some of the principles by which those microstructures are known. The developments accompanying such findings lead to further developments and intensive research providing the required metallurgical support.
Author: Matthew J. Donachie
Publisher: ASM International
ISBN: 161503062X
Category : Technology & Engineering
Languages : en
Pages : 381
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Book Description
Designed to support the need of engineering, management, and other professionals for information on titanium by providing an overview of the major topics, this book provides a concise summary of the most useful information required to understand titanium and its alloys. The author provides a review of the significant features of the metallurgy and application of titanium and its alloys. All technical aspects of the use of titanium are covered, with sufficient metals property data for most users. Because of its unique density, corrosion resistance, and relative strength advantages over competing materials such as aluminum, steels, and superalloys, titanium has found a niche in many industries. Much of this use has occurred through military research, and subsequent applications in aircraft, of gas turbine engines, although more recent use features replacement joints, golf clubs, and bicycles.Contents include: A primer on titanium and its alloys, Introduction to selection of titanium alloys, Understanding titanium's metallurgy and mill products, Forging and forming, Castings, Powder metallurgy, Heat treating, Joining technology and practice, Machining, Cleaning and finishing, Structure/processing/property relationships, Corrosion resistance, Advanced alloys and future directions, Appendices: Summary table of titanium alloys, Titanium alloy datasheets, Cross-reference to titanium alloys, Listing of selected specification and standardization organizations, Selected manufacturers, suppliers, services, Corrosion data, Machining data.
Author: Andrea Di Schino
Publisher: MDPI
ISBN: 3039286501
Category : Technology & Engineering
Languages : en
Pages : 260
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Book Description
Stainless steels represent a quite interesting material family, both from a scientific and commercial point of view, following to their excellent combination in terms of strength and ductility together with corrosion resistance. Thanks to such properties, stainless steels have been indispensable for the technological progress during the last century and their annual consumption increased faster than other materials. They find application in all these fields requiring good corrosion resistance together with ability to be worked into complex geometries. Despite to their diffusion as a consolidated materials, many research fields are active regarding the possibility to increase stainless steels mechanical properties and corrosion resistance by grain refinement or by alloying by interstitial elements. At the same time innovations are coming from the manufacturing process of such a family of materials, also including the possibility to manufacture them starting from metals powder for 3D printing. The Special Issue scope embraces interdisciplinary work covering physical metallurgy and processes, reporting about experimental and theoretical progress concerning microstructural evolution during processing, microstructure-properties relations, applications including automotive, energy and structural.
Author: Thomas Wilkes Robinson
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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Book Description
In recent years, additive manufacturing (AM) has gained prominence in rapid prototyping and production of structural components with complex geometries. Magnesium alloys, whose strength-to-weight ratio is superior compared to steel and aluminum alloys, have shown potential in lightweighting applications. However, commercial beam-based AM technologies have limited success with magnesium alloys due to vaporization and hot cracking. Therefore, as an alternative approach, we propose the use of a near net-shape solid-state additive manufacturing process, Additive Friction Stir Deposition (AFSD), to fabricate magnesium alloys in bulk. In this study, a parametric investigation was performed to quantify the effect of process parameters on AFSD build quality including volumetric defects and surface quality in magnesium alloy AZ31. In order to understand the effect of the AFSD process on structural integrity in the magnesium alloy AZ31, in-depth microstructure and mechanical property characterization was conducted on a bulk AFSD build fabricated with optimized process parameters. Results of the microstructure analysis of the as-deposited AFSD build revealed bulk microstructure similar to wrought magnesium alloy AZ31 plate. Additionally, similar hardness measurements were found in AFSD build compared to control wrought specimens. While tensile test results of the as-deposited AFSD build exhibited a 20 percent drop in yield strength, nearly identical ultimate strength was observed compared to the wrought control. The experimental results of this study illustrate the potential of using the AFSD process to additively manufacture Mg alloys for load bearing structural components with achieving wrought-like microstructure and mechanical properties.
