Download or read book Additive Manufacturing of NiTiHf High Temperature Shape Memory Alloy written by Othmane Benafan and published by . This book was released on 2017 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oxidation Analysis of Additive Manufacturing Shape Memory Alloys written by Hediyeh Dabbaghi and published by . This book was released on 2020 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape memory alloys (SMAs) are considered as interesting engineering smart materials due to their ability to memorize shapes through a thermally induced solid-state phase transition. NiTi-base shape memory alloys are the most prevalent SMAs due to their unique shape memory effect (SME), superelasticity (SE), and damping capacity (DC). The unique properties of SMAs have widely used in the applications with operating temperatures below 100 °C. Since this commercially available NiTi alloy cannot be utilized at a temperature higher than 100 °C, many scientists have paid more attention to the development of a new shape memory material with higher strength and transformation temperatures (TTs). These materials can operate at temperatures above 100°C due to the demand for a broad range of applications from automotive, aerospace, oil, and many other industries. This demand led to the emergence of a new shape-memory alloying system as a High-Temperature Shape Memory Alloys (HTSMAs). HTSMAs have been widely investigated not only for their high transformation temperature but also for good cycling stability, creep, and plastic deformation resistance. In recent years, HTSMAs have been introduced via ternary elemental additions to the base alloy. Alloying is one of the most powerful methods to enhance the properties of NiTi alloys. Addition of a third element can affect the phase transformation behavior, the mechanical properties and oxidation resistance of binary NiTi alloys. Among the potential HTSMAs, NiTiHf alloys have received considerable attention due to its low cost and emerged as potential materials for applications requiring high transformation temperatures (> 100 °C) with high strength and work output. Even though there is a high demand in NiTi and NiTiHf alloys, two main challenges are remaining; the inability to produce complex components and the lack of repeatable processes to provide the desired thermomechanical properties. In recent year, additive manufacturing techniques (AM) have been widely used to fabricate complex components without any tooling and pave the way to tailor the microstructure and critical properties of the alloys by choosing the appropriate processing parameters. Selective laser melting (SLM) is one of the AM processes for fabrication parts which has been utilized in this study. It is well known that SMAs usually have experienced hot rolling during high-temperature, which leads to the formation of high-temperature oxides on the surface. Oxidation causes loss of some elements that have effects on the TTs and shape memory effect. Therefore, the evaluation of oxidation characteristics and the interpretation that this oxidation has a beneficial or destructive effect on the alloys is an important issue. So far, many studies investigated the oxidation behavior of NiTi alloys at high temperatures, but there are a few numbers of research that evaluated the effect of additive elements on the oxidation kinetics which have fabricated conventionally, and just one study has reported the investigation of the oxidation kinetics of NiTiHf. No study has been reported the evaluation of the oxidation behavior of AM shape memory alloys. An understanding of the AM NiTiHf alloy oxidation and how it is affected by alloy characteristics and exposure conditions is demanded and should be evaluated. In this study, to analyze the oxidation kinetics of NiTiHf and NiTi, which are fabricated through SLM, a series of samples was built. The effect of Hf addition on the high-temperature oxidation kinetics and the structure of oxides that formed on the surface of AM NiTiHf alloy was evaluated to estimate the design life of this alloy in terms of its oxidation resistance as components used at elevated temperature. Thermogravimetric analyses (TGA) were performed at high temperature for different times in dry air. Furthermore, the oxidation behavior of conventional Ni50.4Ti29.6Hf20 and Ni50.8Ti49.2 was measured for comparison to see the differences between the oxidation resistance of samples that fabricated additively with those produced conventionally. After oxidation, the microstructure and chemical composition of oxide formed were analyzed by SEM/EDS. It is found that the addition of 20 at. % Hf decreases the oxidation resistance of NiTi alloys. The oxidation behavior of NiTi alloys is well fitted with parabolic rate law, while for NiTiHf alloys, the trend is different. In the early stage of oxidation, these alloys obey logarithmic rate law, and after a while, they follow parabolic rate law. The activation energy of NiTiHf alloys was lower than NiTi alloys, which proved that ternary alloy oxidized faster than binary alloys. It was observed that six main oxide layers formed during the oxidation. The Hf-rich oxide layer, which had the highest thickness, played a significant role in mass-gain and oxidation kinetic. The results of the study pave the way for estimating the service life of high-temperature actuators and components made of these functional alloys.

Download or read book Additive Manufacturing of Shape Memory Materials written by Mehrshad Mehrpouya and published by Elsevier. This book was released on 2024-10-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing of Shape Memory Materials: Techniques, Characterization, Modeling, and Applications outlines an array of techniques and applications for additive manufacturing (AM) and the use of various shape memory materials, covering corrosion properties, material sensitivity to thermal, magnetic, and electrical effects, as well as sensitivity of shape memory properties to AM parameters, including part geometry effects and post-process treatments. Design for AM and a number of different AM methods are discussed, with materials covered including shape memory alloys, shape memory polymers, high-temperature shape memory alloys, and magnetic shape memory alloys. Characterization and modeling methods are also included, as is a chapter dedicated to real-world applications of these production techniques and materials. Provides an overview of various shape memory materials, their additive manufacturing techniques and processes, their applications, and opportunities and challenges related to their production and use Outlines the thermomechanical and functional properties of shape memory alloys that can be applied to their additive manufacturing processes Covers techniques for additive manufacturing of shape memory polymers, shape memory alloys, high-temperature shape memory alloys, and magnetic shape memory alloys Discusses characterization, post-processing, modeling, and applications of shape memory materials

Download or read book Advances in Metal Additive Manufacturing written by Sachin Salunkhe and published by Elsevier. This book was released on 2022-10-10 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Metal Additive Manufacturing explains fundamental information and the latest research on new technologies, including powder bed fusion, direct energy deposition using high energy beams, and hybrid additive and subtractive methods. This book introduces readers to the technology, provides everything needed to understand how the different stages work together, and inspires to think beyond traditional metal processing to capture new ideas in metal. Chapters offer an introduction on metal additive manufacturing, processes, and properties and standards and then present surveys on the most significant international advances in metal additive manufacturing. Throughout, the book presents a focus on the effect of important process parameters on the microstructure, mechanical properties and wear behavior of additively manufactured parts. Covers the entire process chain of metal additive manufacturing, from input data preparation to part certification Describes a wide range of the latest design tools and options, including generative design, topology optimization, and lattice and surface optimization Addresses additive manufacturing, with a comprehensive list of metals including titanium, aluminum, iron-and nickel-based alloys and Inconel 718

Download or read book NiTiHf High Temperature Shape Memory Alloy Design with the Assistance of Machine Learning written by Aysel Aysu Çatal and published by . This book was released on 2022 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shape Memory Alloy Engineering written by Antonio Concilio and published by Butterworth-Heinemann. This book was released on 2021-01-13 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape Memory Alloy Engineering: For Aerospace, Structural and Biomedical Applications, Second Edition embraces new advancements in materials, systems and applications introduced since the first edition. Readers will gain an understanding of the intrinsic properties of SMAs and their characteristic state diagrams. Sections address modeling and design process aspects, explore recent applications, and discuss research activities aimed at making new devices for innovative implementations. The book discusses both the potential of these fascinating materials, their limitations in everyday life, and tactics on how to overcome some limitations in order to achieve proper design of useful SMA mechanisms. Provides a greatly expanded scope, looking at new applications of SMA devices and current research activities Covers all aspects of SMA technology - from a global state-of-the-art survey, to the classification of existing materials, basic material design, material manufacture, and from device engineering design to implementation within actual systems Presents the material within a modular architecture over different topics, from material conception to practical engineering realization

Download or read book Precipitation Heat Treatment of Laser Directed Energy Deposition Additive Manufactured Ti Rich NiTi Shape Memory Alloys written by Jessica Spoll and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigates additive manufacturing as a fabrication method for shape memory alloys. Shape memory alloys (SMAs) undergo a reversible solid-state martensitic phase transformation that results in high recoverable strains, making them useful in industrial applications. NiTi alloys are widely used SMAs. However, due to their sensitive material properties, micromachining fine features in NiTi materials is difficult. Additive manufacturing (AM) allows for complex 3D geometries to be fabricated directly to the final dimensions, albeit surface finishing may be required. Moreover, AM has the capability to design material microstructures "on demand" by controlling input feedstock composition and deposition parameters during fabrication. This opens up avenues for manufacturing gradient microstructures for functionally graded materials.For this research, Ti-rich builds were fabricated using the additive manufacturing technique of laser directed energy deposition. The feedstock was elementally blended Ni and Ti powders and resulted in a Ti53.1Ni46.9 at.% build. Previous results from the Hamilton group showed that laser directed energy deposition additive manufactured (LDEDAM) Ni-rich NiTi alloys had an anisotropic microstructure in the as-deposited condition. The degree of anisotropy was reduced using precipitation heat treatment. For LDEDAM Ti-rich NiTi alloys in the as-deposited condition, previous work showed the thermal-induced martensitic phase transformation (TIMT) occurred at temperatures higher than those for the Ni-rich compositions. Thus, the Ti-rich material is attractive for applications requiring the shape memory effect above room temperature. This work builds upon the Hamilton group's previous work on as-deposited LDEDAM Ti-rich NiTi alloys. The goal of this research is to investigate the influence of precipitation heat treatment on the transformation temperatures of the as-deposited material condition. Two different durations are used at one precipitation heat treatment temperature. Differential scanning calorimetry (DSC) experiments are used to measure characteristic phase transformation temperatures and enthalpies. Samples for calorimetry analysis were micromachined from different height locations within the LDEDAM build in order to spatially resolve the behavior, as the layer-by-layer fabrication is expected to cause microstructure anisotropy for the Ti-rich NiTi alloys. The results from DSC analysis show that the transformation temperatures for the precipitation heat treated material are comparable to the as-deposited material. The enthalpy measurements for the TIMT on cooling and heating become equivalent for the longer duration precipitation heat treatment. Ultimately, the results show that precipitation treatments may improve the reversibility of the TIMT without altering the operating temperature ranges.

Download or read book Shape Memory Alloy Actuators written by Mohammad H. Elahinia and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic approach to realizing NiTi shape memory alloy actuation, and is aimed at science and engineering students who would like to develop a better understanding of the behaviors of SMAs, and learn to design, simulate, control, and fabricate these actuators in a systematic approach. Several innovative biomedical applications of SMAs are discussed. These include orthopedic, rehabilitation, assistive, cardiovascular, and surgery devices and tools. To this end unique actuation mechanisms are discussed. These include antagonistic bi-stable shape memory-superelastic actuation, shape memory spring actuation, and multi axial tension-torsion actuation. These actuation mechanisms open new possibilities for creating adaptive structures and biomedical devices by using SMAs.

Download or read book Laser Based Additive Manufacturing of Metal Parts written by Linkan Bian and published by CRC Press. This book was released on 2017-08-09 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-Based Additive Manufacturing (LBAM) technologies, hailed by some as the "third industrial revolution," can increase product performance, while reducing time-to-market and manufacturing costs. This book is a comprehensive look at new technologies in LBAM of metal parts, covering topics such as mechanical properties, microstructural features, thermal behavior and solidification, process parameters, optimization and control, uncertainty quantification, and more. The book is aimed at addressing the needs of a diverse cross-section of engineers and professionals.

Download or read book NiTi Materials written by Yoshiki Oshida and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-08-24 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-Titanium alloys are smart materials exhibiting unique properties such as superelasticity and shape-memory effect. The material has been used as orthodontic wires in the dental field for over 20 years. This book is a comprehensive overview to the field of Ni-Ti Materials and the physical, chemical and mechanical properties of this versatile alloy. In addition, complications and challenges exhibited in applications are also discussed.

Download or read book Fabrication and Processing of Shape Memory Alloys written by Kush Mehta and published by Springer. This book was released on 2018-09-01 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book showcases different processes of fabrication and processing applied to shape memory alloys. It provides details and collective information on working principles, process mechanisms, salient features, novel aspects, process capabilities, properties of material and unique applications of shape memory alloys. The recent progress on fabrication and processing are specially addressed in this book. It covers major topics of manufacturing such as machining, joining, welding and processing of shape memory alloys.

Download or read book Nickel Titanium Smart Hybrid Materials written by Sabu Thomas and published by Elsevier. This book was released on 2022-01-26 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-Titanium Smart Hybrid Materials: From Micro- to Nano-structured Alloys for Emerging Applications describes advanced properties that can be adapted in NiTi-alloys. Nickel-Titanium (NiTi) systems are receiving wide demand in growing industries due to their smart, high-temperature or biocompatible behavior. These influenced behaviors are carefully described in the micro-scale and nanoscale range, with NiTi smart materials described on the basis of their shape memory effect (SME) and super-elastic (SE) properties for sensor and actuator application. This book discusses novel properties of nickel-titanium systems, helping materials scientists and engineers produce smart technologies and systems for the aeronautical, automobile, mechanical, healthcare and electronics industries. Describes the use of nanotechnology and microtechnology in nickel-titanium-based systems Outlines the major properties of Nickel-Titanium Nanoalloys Assesses the major challenges of manufacturing nickel-titanium nanoalloys at an industrial scale

Download or read book Shape Memory Alloys written by M. Fremond and published by Springer. This book was released on 2014-05-04 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of two chapters. The first chapter deals with the thermomechanical macroscopic theory describing the transformation and deformation behavior of shape memory alloys. The second chapter deals with the extensive and fundamental review of the experimental works which include crystallography, transformations and mechanical characteristics in Ti-Ni, Cu-base and ferrous shape memory alloys.

Download or read book Handbook of Nanocomposite Supercapacitor Materials IV written by Kamal K. Kar and published by Springer Nature. This book was released on 2023-03-23 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers next-generation nanocomposite supercapacitor materials. It deals with a wide range of emerging and sustainable supercapacitors based on, e.g., low-dimensional materials including transition metal oxides, carbons, Mxenes, etc., and metal-organic frameworks. Additionally, it features up-to-date coverage of advanced supercapacitors such as 3D printing, atomic layer deposition, recycling, quantum, on-chip, shape memory, self-healing, and micro-scale supercapacitors. This book is part of the Handbook of Nanocomposite Supercapacitor Materials. Supercapacitors have emerged as promising devices for electrochemical energy storage, playing an important role in energy harvesting for meeting the current demands of increasing global energy consumption. The handbook covers the materials science and engineering of nanocomposite supercapacitors, ranging from their general characteristics and performance to materials selection, design and construction. Covering both fundamentals and recent developments, this handbook serves a readership encompassing students, professionals and researchers throughout academia and industry, particularly in the fields of materials chemistry, electrochemistry, and energy storage and conversion. It is ideal as a reference work and primary resource for any introductory senior-level undergraduate or beginning graduate course covering supercapacitors.

Download or read book Proceedings of the Second International Conference on Computing Communication Security and Intelligent Systems written by Shahid Mumtaz and published by Springer Nature. This book was released on with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Martensitic Transformation written by Zenji Nishiyama and published by Elsevier. This book was released on 2012-12-02 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Martensitic Transformation examines martensitic transformation based on the known crystallographical data. Topics covered range from the crystallography of martensite to the transformation temperature and rate of martensite formation. The conditions for martensite formation and stabilization of austenite are also discussed, along with the crystallographic theory of martensitic transformations. Comprised of six chapters, this book begins with an introduction to martensite and martensitic transformation, with emphasis on the basic properties of martensite in steels such as carbon steels. The next two chapters deal with the crystallography of martensite and discuss the martensitic transformation behavior of the second-order transition; lattice imperfections in martensite; and close-packed layer structures of martensites produced from ? phase in noble-metal-base alloys. Thermodynamical problems and kinetics are also analysed, together with conditions for the nucleation of martensite and problems concerning stabilization of austenite. The last chapter discusses the theory of the mechanism underlying martensitic transformation. This monograph will be of interest to metallurgists and materials scientists.

Download or read book Advanced Manufacturing Processes written by Yashvir Singh and published by CRC Press. This book was released on 2022-08-11 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of manufacturing science has evolved over the years with the introduction of non-traditional machining processes. This reference book introduces the latest trends in modeling and optimization of manufacturing processes. It comprehensively covers important topics including additive manufacturing at multi-scales, sustainable manufacturing, rapid manufacturing of metallic components using 3D printing, ultrasonic-assisted bone drilling for biomedical applications, micromachining, and laser-assisted machining. This book is useful to senior undergraduate and graduate students in the fields of mechanical engineering, industrial and production engineering, and aerospace engineering.