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transmission electron microscopy
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Journal Articles
AM&P Technical Articles (2017) 175 (5): 59–62.
Published: 01 July 2017
...Dheepa Srinivasan This article series explores the indispensable role of characterization in the development of cold spray coatings. Transmission electron microscopy is used to understand powder characteristics, cold spray coating deformation behavior both within splats as well as near the coating...
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This article series explores the indispensable role of characterization in the development of cold spray coatings. Transmission electron microscopy is used to understand powder characteristics, cold spray coating deformation behavior both within splats as well as near the coating-substrate interface, phase transformations in the as-sprayed and heat treated conditions, phase equilibria of the coating under the operating conditions pertaining to the application of the coating, the coating recovery mechanism, and the thermal stability of the coating.
Journal Articles
AM&P Technical Articles (2024) 182 (1): 14–17.
Published: 01 January 2024
... S S E SM I|XJEADN- RU EAARLYI/TFYE BA RP PU LAIRCYA T2I0O2N4 1144 httpsdoi.org/10.31399/asm.amp.2024-01.p014 HOLOMICROSCOPE: TRANSMISSION ELECTRON MICROSCOPY MEETS MIXED REALITY Patrick R. Cantwell,* Joan D. Stanescu,* Andrea J. Harmer, and Martin P. Harmer Lehigh University, Bethlehem, Pennsylvania...
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A mixed-reality application called HoloMicroscope helps microscopists make decisions and analyze data efficiently while using transmission electron microscopes. In the context of materials research, using mixed reality augments a user’s interaction by allowing them to see a TEM column and its control panels, while also interacting with three-dimensional holograms that are projected into their field of view. Introduction of mixed reality into a data-intensive research workflow could help accelerate scientific discovery. This article provides background about technology and a case study in its use.
Journal Articles
AM&P Technical Articles (2012) 170 (4): 17–21.
Published: 01 April 2012
...Matthew Olszta; Daniel Schreiber; Larry Thomas; Stephen Bruemmer Researchers at Pacific Northwest National Laboratory (PNNL) use a combination of scanning and transmission electron microscopy, atom probe tomography, and focused ion beam milling to analyze corrosion and crack structures in light...
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Researchers at Pacific Northwest National Laboratory (PNNL) use a combination of scanning and transmission electron microscopy, atom probe tomography, and focused ion beam milling to analyze corrosion and crack structures in light-water reactor components with near-atomic spatial resolution.
Journal Articles
AM&P Technical Articles (2020) 178 (2): 16–19.
Published: 01 February 2020
... bainitic steel using high resolution transmission electron microscopy (HRTEM). This entry won the prestigious 2019 Jacquet-Lucas Award for Excellence in Metallography at the International Metallographic Contest held in Portland, Oregon, October 2019. This article describes a procedure for optimizing...
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This article describes a procedure for optimizing the annealed microstructure of a high Al KAB steel. The main focus is directed toward characterization of microstructural development during annealing of different phases in a nanostructured bainitic steel using high resolution transmission electron microscopy (HRTEM). This entry won the prestigious 2019 Jacquet-Lucas Award for Excellence in Metallography at the International Metallographic Contest held in Portland, Oregon, October 2019.
Journal Articles
AM&P Technical Articles (2023) 181 (1): 32–35.
Published: 01 January 2023
.... The article addresses the advantages and disadvantages of each technique compared to the other approaches. Copyright © ASM International® 2023 2023 ASM International atom probe tomography electron backscatter diffraction phase analysis transmission electron microscopy X-ray diffraction 3...
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This article reviews the analytical techniques used for phase identification in components, including x-ray diffraction, metallography/microscopy, electron backscatter diffraction, trasmission electron microscopy,and atom probe tomography. The article addresses the advantages and disadvantages of each technique compared to the other approaches.
Journal Articles
AM&P Technical Articles (2021) 179 (4): 62–65.
Published: 01 May 2021
...[4]. It was shown through conventional transmission electron microscopy (CTEM) bright field (BF) and dark field (DF) imaging that increases in vanadium content led to increases in vanadium containing nitride precipitation. The increased vanadium nitride precipitation significantly increased both case...
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Using advanced characterization techniques on surface hardened steels builds a richer understanding of the underlying metallurgical phenomena.
Journal Articles
AM&P Technical Articles (2016) 174 (4): 48.
Published: 01 April 2016
..., scanning electron microscopy, transmission elec- 2 X-ray diffraction phase formation, coating macroand microstrain, coating relaxation behavior, presence of any coating tron microscopy, electron backscatter diffraction, and electron texture probe microanalysis are integral to understanding the highly...
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This new article series explores the indispensable role of characterization in the development of cold spray coatings and illustrates some of the common processes used during coatings development. This article provides a list of techniques to be covered in subsequent articles.
Journal Articles
AM&P Technical Articles (2017) 175 (4): 42–43.
Published: 01 May 2017
..., multiple splats, or the coating-substrate interface. FIB resembles scanning electron microscopy (SEM) except that instead of using a focused beam of electrons to raster the sample surface, it uses a focused beam of ions (usually gallium) either to image the sample (using low-beam currents) or to remove...
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Focused ion beam (FIB) systems are selectively used in cold spray coating characterization to gather information on the nature of splat formation, single splats, multiple splats, or the coating-substrate interface. Electron probe microanalysis has been used in cold-sprayed coating characterization primarily to understand the bonding mechanism at the coating-substrate interface.
Journal Articles
AM&P Technical Articles (2013) 171 (9): 20–25.
Published: 01 September 2013
... transmission electron microscopy. Bell Laboratories exploited Cu-Ni-Sn alloys in the late 1960s, developing innovations and patents in the 1970s. However, commercialization of wrought Cu-15Ni-8Sn alloy was limited and eventually abandoned due to hot cracking during traditional hot rolling or forging. Although...
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The unique metallurgy and microstructure of Cu-Ni-Sn spinodal alloys provide a combination of strength, toughness, hardness, and corrosion resistance, suiting them for applications ranging from bearings, bushings, and friction surfaces in all sorts of machinery to electrical connectors and EMI shielding gaskets.
Journal Articles
AM&P Technical Articles (2018) 176 (1): 27–30.
Published: 01 January 2018
... plane. Three techniques have been used to image dislocations in ice, transmission electron microscopy (TEM), etch-pitting replication, and x-ray topography. There have only been two published TEM studies of dislocations in ice[15,16], and in both cases only grown-in dislocations were examined. Although...
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Characterizing ice and snow is important not only for building accurate climate models, but also for activities such as relating the mechanical properties of sea ice to its microstructure so that the interaction of ice with ships and structures can be better understood. This article describes the microstructural characterization of ice. Many microstructural characterization techniques that can be applied to other materials also can be used to examine ice.
Journal Articles
AM&P Technical Articles (2021) 179 (5): 53–54.
Published: 01 July 2021
... levels in both warm and cold spray coatings, using the inert gas fusion method. Other practitioners have detected the oxygen using high-resolution energy-filtered transmission electron microscopy and have found that most of the oxygen exists near the ADVANCED MATERIALS & PROCESSES | JULY/AUGUST 2021 53 7...
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This article series explores the indispensable role of characterization in the development of cold spray coatings and illustrates some of the common processes used during coating development.
Journal Articles
Hassina Z. Bilheux, R. Aaron Hanks, Jean-Christophe Bilheux, Harley Skorpenske, Mary-Ellen Donnelly ...
AM&P Technical Articles (2023) 181 (8): 18–23.
Published: 01 November 2023
... microscopy[13], transmission electron microscopy[14], optical spectroscopy[15], and Raman spectroscopy[16]. Recently, a novel nondestructive capability called wavelength-dependent or hyperspectral imaging has emerged in the field of neutron radiography and computed tomography. Unlike reactor-based neutron...
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Wavelength-dependent or hyperspectral imaging is a novel nondestructive characterization technique in the field of neutron radiography and computed tomography. A dedicated facility named VENUS is currently being built at Oak Ridge National Laboratory to provide these characterization capabilities for academia, industry, and other national laboratories. This feature article describes the VENUS capabilities for materials science and engineering, provides a quick overview of the modes of access of the facility, and illustrates the nondestructive measurements and interpretation of results.
Journal Articles
AM&P Technical Articles (2023) 181 (1): 21–22.
Published: 01 January 2023
... on discontinuous precipitation in Al-Li alloys as part of his interview. It was a commendable performance and Dave was offered the position and started in fall 1976. Joe Goldstein, my Ph.D. advisor, suggested I ask Dave to join my advising team and assist me in using transmission electron microscopy (TEM) and x...
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Meet David B. Williams, FASM, the new president of ASM, and learn about his academic and scientific background, leadership, and contributions as a researcher and educator.
Journal Articles
AM&P Technical Articles (2017) 175 (8): 37–38.
Published: 01 November 2017
... the coating with different grain sizes. Euler angle maps indicate locations with formation behavior, and bonding mechanism in cold spray differing orientation by different colors (Fig. 1). coatings. Although transmission electron microscopy (TEM) provides adequate crystallographic information, EBSD...
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This article series explores the indispensable role of characterization in the development of cold spray coatings. Electron backscatter diffraction (EBSD) is a characterization technique that enables determination of crystal orientations, texture, boundary misorientations and deformation behavior, and bonding mechanism in cold spray coatings.
Journal Articles
AM&P Technical Articles (2013) 171 (11): 48–50.
Published: 01 November 2013
... provides ductility, resulting in a balance of strength and ductility unique to flash processing. The final microstructure after FP was characterized using transmission electron microscopy, single-sensor differential thermal analysis (SSDTA), and microindentation hardness. A transmission electron micrograph...
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Flash processing, a new heat treatment for steels based on the concept of rapid thermal cycling, has been shown to achieve new levels of strength and ductility. This article describes the process, its effects on microstructure, and the phase transformations involved. It also discusses current and potential future applications.
Journal Articles
AM&P Technical Articles (2019) 177 (7): 43–47.
Published: 01 October 2019
... it is not revealed by SEM. Further microstructural details were revealed using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) techniques. Figure 5 shows a hardened cross section of NiTi. What appeared to be a monolithic field of NiTi under optical and SEM imaging is more...
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Newly developed nickel-titanium (NiTi) alloys are well suited for bearings and gears in demanding applications.
Journal Articles
AM&P Technical Articles (2021) 179 (1): 32–37.
Published: 01 January 2021
... Scanning transmission electron microscopy-based cross-sectional micrographs of the deformed microstructure of the nanostructured Cu cold sprayed coatings. A large amount of atomic lattice fringes is observed in the leftmost micrograph. Adapted from Sousa et al.[16]. microbial concentration were recorded...
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Enhanced antiviral performance is associated with antipathogenic copper material consolidations obtained using cold spray processing.
Journal Articles
AM&P Technical Articles (2016) 174 (2): 16–19.
Published: 01 February 2016
... International® 2016 2016 ASM International defect analysis microelectronic devices scanning transmission electron microscopy httpsdoi.org/10.31399/asm.amp.2016-02.p016 16 ADVANCED MATERIALS & PROCESSES | FEBRUARY 2016 USING HIGH RESOLUTION S/TEM TO ANALYZE SMARTPHONE DISPLAYS The rapidly increasing...
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The rapidly increasing complexity of microelectronic devices is necessitating the use of sophisticated imaging tools to analyze and correct defects. This article describes advanced analytical techniques in use at the Fraunhofer Center for Applied Microstructure Diagnostics.
Journal Articles
AM&P Technical Articles (2019) 177 (3): 26–30.
Published: 01 April 2019
...]. Additional FIB applications include sample preparation for transmission electron microscopy, integrated circuit modification, thin film head manufacturing, ~5-nm resolution scanning ion microscopy, secondary ion mass spectroscopy (SIMS), ion implantation without a mask, and lithography. Jon H. Orloff, a 1977...
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The Oregon Graduate Center−later named the Oregon Graduate Institute−played a significant role in metallurgy in the Northwest for nearly four decades. This article reviews important work done by the organization in the second half of the twentieth century.
Journal Articles
AM&P Technical Articles (2020) 178 (5): 15–19.
Published: 01 July 2020
...), transmission electron microscopy (TEM), and atomic probe tomography (APT), which cover the full range of microstructure lengthscales from micro to the atomic scale. A holistic approach is presented in Fig. 3, demonstrating the use of several microscopy techniques to understand microstructural aspects in AM...
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This article explains how SEM, TEM, and atom probe tomography are being used in the development of additively manufactured high-entropy alloys (HEAs), revealing critical features such as anisotropic microstructure and metallurgical defects. It also discusses ongoing efforts to improve the predictability and analysis of HEA microstructure using data-driven approaches.
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