Elucidating Deformation Mechanisms in Shape Memory Alloys Using 3D X-ray Diffraction PDF Download
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Author: Ashley N. Bucsek
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 156
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Book Description
Author: Ashley N. Bucsek
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 156
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Book Description
Author: Guozheng Kang
Publisher: Springer Nature
ISBN: 9819927528
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
Written by leading experts in the field, this book highlights an authoritative and comprehensive introduction to thermo-mechanically coupled cyclic deformation and fatigue failure of shape memory alloys. The book deals with: (1) experimental observations on the cyclic deformation and fatigue failure in the macroscopic and microscopic scales; (2) molecular dynamics and phase-field simulations for the thermo-mechanical behaviors and underlying mechanisms during cyclic deformation; (3) macroscopic phenomenological and crystal plasticity-based cyclic constitutive models; and (4) fatigue failure models. This book is an important reference for students, practicing engineers and researchers who study shape memory alloys in the areas of mechanical, civil and aerospace engineering as well as materials science.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
The goal of this research was to understand the fundamental mechanics that drive the deformation and failure of shape memory alloys (SMAs). SMAs are difficult materials to characterize because of the complex phase transformations that give rise to their unique properties, including shape memory and superelasticity. These phase transformations occur across multiple length scales (one example being the martensite-austenite twinning that underlies macroscopic strain localization) and result in a large hysteresis. In order to optimize the use of this hysteretic behavior in energy storage and damping applications, we must first have a quantitative understanding of this transformation behavior. Prior results on shape memory alloys have been largely qualitative (i.e., mapping phase transformations through cracked oxide coatings or surface morphology). The PI developed and utilized new approaches to provide a quantitative, full-field characterization of phase transformation, conducting a comprehensive suite of experiments across multiple length scales and tying these results to theoretical and computational analysis. The research funded by this award utilized new combinations of scanning electron microscopy, diffraction, digital image correlation, and custom testing equipment and procedures to study phase transformation processes at a wide range of length scales, with a focus at small length scales with spatial resolution on the order of 1 nanometer. These experiments probe the basic connections between length scales during phase transformation. In addition to the insights gained on the fundamental mechanisms driving transformations in shape memory alloys, the unique experimental methodologies developed under this award are applicable to a wide range of solid-to-solid phase transformations and other strain localization mechanisms.
Author: Chain Tsuan Liu
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 464
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Book Description
Author: Beth Anna Last
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The layer-by-layer deposition process of additive manufacturing (AM) offers the capability to design material microstructures on multiple length scales. For NiTi shape memory alloys, designing material microstructures using AM would allow for unparalleled tailoring of the multiscale martensitic transformation and shape memory response. However, the laser-based directed energy deposition (LDED) AM technique produces localized microstructures which are distinct from those found in conventionally processed alloys. This work characterizes the grain and precipitate microstructures on multiple length scales for LDED fabricated NiTi alloys and assess the capability for tailoring the martensitic transformation morphology shape memory response through post-deposition heat treatments. Build coupons were fabricated by LDED AM using elementally blended Ni and Ti powder feedstock. The use of elemental powders allowed for a Ti-rich and a Ni-rich powder feedstock composition to be blended; thus, both shape memory effect (Ti-rich) and superelastic (Ni-rich) behaviors were investigated. Specimens were extracted from the fabricated build coupons to investigate the localized microstructure and shape memory behaviors. A full-field deformation analysis technique was employed to correlate the AM microstructure to the deformation mechanisms.The results of this work show that the NiTi LDED AM builds are inherently spatially varying on multiple microstructure length scales. The grain structure resulting from the AM process was similar for both feedstock compositions: fine grains within the interfacial regions formed by overlapping passes/layers and larger columnar grains within bulk regions (i.e. away from these interfaces). As a result of the spatially varying microstructure, as built LDED NiTi alloys exhibit a hardening like response and localized strain concentrations. Post-deposition heat treatment of the Ni-rich alloys reduced the spatial variation in the Ni4Ti3 precipitate microstructure and increased the localized superelastic strains compared to the as built condition, with the solutionizing and precipitation aging treatment resulting in the most spatially uniform Ni4Ti3 precipitate morphology. For the LDED alloys, shape memory effect recovery strains of 4.0 % (for Ti-rich alloys) and superelastic recovery strains of -6.0 % (for solutionized and aged Ni-rich alloys) were achieved.
Author: Gen Satoh
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Modifications to shape memory properties are investigated through the use of temperature-dependent optical microscopy, temperature-dependent X-ray diffraction, and nano-indentation. As shape memory alloys are increasingly applied at smaller length scales due to advantages in achievable actuation frequency and the growth of micro-scale applications in medical devices, the anisotropy of the shape memory response at the grain level becomes an important consideration for optimizing device performance. The formation of crystallographic texture in NiTi thin films through controlled melting and abnormal grain growth during solidification is investigated through the use of x-ray diffraction and electron backscatter diffraction measurements. An experimentally validated Monte-Carlo grain growth model is developed to predict the texture formation based on the anisotropy in the surface energy between the growing grains and the adjacent liquid. Despite their unique properties, SMAs are not expected to entirely replace more commonly used alloys in most conceivable applications.
Author: Jackson Schwarz
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Shape memory alloys are a special class of materials that have a unique ability to "remember" their previous shape when they are pulled and stretched well beyond the ~1% recoverable deformation of ductile metals. Recovery via unloading is the superelastic SMA response and recovery via heating is referred to as shape memory effect SMA response. Processing of SMAs is designed to tune the composition and microstructure length scales to customize the shape memory responses for practical applications in aerospace and automotive to biomedical devices. Understanding how interactions between the underlying shape memory transformation mechanism and the SMA microstructure control the shape memory responses requires full-field (localized and pseudo-pointwise) micro-scale deformation measurements to supplement macro scale thermo-mechanical experimentation. This thesis project employs digital image correlation (DIC) analysis for full-field strain analysis. DIC analysis parameters are systematically varied for refining the local strain field contours resulting from the shape memory transformation morphology evolving within and interacting with different structural length scales. The research provides insights into optimizing DIC for scrutinizing deformation mechanisms interacting with different microstructure length scales.
Author: Zeljka Budrovic
Publisher:
ISBN:
Category :
Languages : en
Pages : 133
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Book Description
Author: T Yoneyama
Publisher: Elsevier
ISBN: 1845695240
Category : Technology & Engineering
Languages : en
Pages : 354
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Book Description
Shape memory alloys are suitable for a wide range of biomedical applications, such as dentistry, bone repair and cardiovascular stents. Shape memory alloys for biomedical applications provides a comprehensive review of the use of shape memory alloys in these and other areas of medicine.Part one discusses fundamental issues with chapters on such topics as mechanical properties, fabrication of materials, the shape memory effect, superelasticity, surface modification and biocompatibility. Part two covers applications of shape memory alloys in areas such as stents and orthodontic devices as well as other applications in the medical and dental fields.With its distinguished editors and international team of contributors, Shape memory alloys for biomedical applications is an essential reference for materials scientists and engineers working in the medical devices industry and in academia. - A comprehensive review of shape memory metals and devices for medical applications - Discusses materials, mechanical properties, surface modification and biocompatibility - Chapters review medical and dental devices using shape memory metals, including stents and orthodontic devices
Author: Jinlian Hu
Publisher: Smithers Rapra
ISBN: 1909030333
Category : Science
Languages : en
Pages : 326
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Book Description
Shape-memory polymers (SMP) are a unique branch of the smart materials family which are capable of changing shape on-demand upon exposure to external stimulus. The discovery of SMP made a significant breakthrough in the developments of novel smart materials for a variety of engineering applications, superseded the traditional materials, and also influenced the current methods of product designing. This book provides the latest advanced information of on-going research domains of SMP. This will certainly enlighten the reader to the achievements and tremendous potentials of SMP. The basic fundamentals of SMP, including shape-memory mechanisms and mechanics are described. This will aid reader to become more familiar with SMP and the basic concepts, thus guiding them in undergoing independent research in the SMP field. The book also provides the reader with associated challenges and existing application problems of SMP. This could assist the reader to focus more on these issues and further exploit their knowledge to look for innovative solutions. Future outlooks of SMP research are discussed as well. This book should prove to be extremely useful for academics, R&D managers, researcher scientists, engineers, and all others related to the SMP research.
