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annular projection
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2024
DOI: 10.31399/asm.tb.pmamfa.t59400391
EISBN: 978-1-62708-479-6
... FESEM field-emission scanning electron microscopy FFF fused filament fabrication FR flame retardant/retardancy FSAM friction stir additive manufacturing GSD geometric standard deviation HAADF high-angle annular dark field He-Cd helium-cadmium HIP hot isostatic pressing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110461
EISBN: 978-1-62708-247-1
... by diffraction contrast. The annular detector is usually installed at a specified port on the TEM column and is at a fixed height. The electromagnetic lenses of a TEM can be adjusted to selectively project electrons scattered at various angles on to the annular detector. The STEM-ADF image, shown...
Abstract
The ultimate goal of the failure analysis process is to find physical evidence that can identify the root cause of the failure. Transmission electron microscopy (TEM) has emerged as a powerful tool to characterize subtle defects. This article discusses the sample preparation procedures based on focused ion beam milling used for TEM sample preparation. It describes the principles behind commonly used imaging modes in semiconductor failure analysis and how these operation modes can be utilized to selectively maximize signal from specific beam-specimen interactions to generate useful information about the defect. Various elemental analysis techniques, namely energy dispersive spectroscopy, electron energy loss spectroscopy, and energy-filtered TEM, are described using examples encountered in failure analysis. The origin of different image contrast mechanisms, their interpretation, and analytical techniques for composition analysis are discussed. The article also provides information on the use of off-axis electron holography technique in failure analysis.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400109
EISBN: 978-1-62708-258-7
.... Figure 5.8 shows a simplified ray diagram of a metallurgical microscope. In this diagram, the reflected light from the specimen passes through the objective in the form of a magnified image of the specimen. This magnified image is projected onto the image plane of the eyepiece (called the real image...
Abstract
This chapter describes the various features of the metallurgical microscope. Key concepts are defined such as resolving power, the virtual image, bright- and dark-field illumination, numerical aperture, focal length, image contrast, depth of field, and spherical and chromatic aberration. Metallurgical microscope features such as apochromatic objectives, hyperplane oculars, vertical illuminators, counting reticles, widefield oculars, polarization filters, field diaphragms, interferometers, and tungsten-halogen lamps are explained. The optical system, nosepiece, types of objectives (the lens assembly close to the specimen) and eyepieces, and components of the illumination system are all explained. The last part of this chapter describes special procedures involved in using and calibrating the metallurgical microscope.
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2024
DOI: 10.31399/asm.tb.pmamfa.t59400027
EISBN: 978-1-62708-479-6
... ( d F ). Martin’s diameter ( d M ) refers to the diameter measured with consideration of the line that divides the particle into two equal parts. The diameter of the project area ( d a ) refers to the circle that has equal area with the particle. It is apparent from Fig. 3.4 that d M...
Abstract
This chapter explains how to measure the shape, size, microstructure, and composition of powders as well as their flowability and crystallization behavior. It presents detailed workflows and calculations based on SEM, TEM, FESEM, and STEM imaging, x-ray diffraction, differential scanning calorimetry, EDS and EELS spectroscopy, and powder sieving. It also discusses the measurement of crystallite size, lattice mismatch, and crystallinity and the relationship between surface area and flowability.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870307
EISBN: 978-1-62708-314-0
... locators. Another recent development is the use of laser projection units for establishing part and hole location. A typical application for a laser projection system is shown in Fig. 11.3 . Fig. 11.3 Laser projection location. Source: Laser Projection Technologies, Inc. It is important...
Abstract
This chapter covers basic machining and assembly operations, with an emphasis on hole preparation for mechanical fasteners. It describes manual, power feed, and automated drilling techniques as well as reaming and countersinking. It discusses various types of fasteners, including rivets, pins, and bolts, along with selection factors and special considerations for composite joints. It also includes information on interference-fit and blind fasteners as well as trimming operations, general assembly considerations, and sealing and painting procedures.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370115
EISBN: 978-1-62708-447-5
... Annular wind box which surrounds the melting zone and distributes the air through individual tuyeres to provide air for combustion Slag port to drain the slag which floats over the metal bath Tap hole that is opened by a spike or closed shut using a conical clay bot A launder to direct the tapped...
Abstract
The melting furnace is a critically important piece of equipment in a foundry; it influences the balance between the metal required by molding machines and the melting capacity. This chapter presents the features, types, advantages, and applications of furnaces suitable for iron and steels such as cupolas, induction furnaces, and arc furnaces.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390039
EISBN: 978-1-62708-459-8
Abstract
This chapter covers the different types of wear encountered in metalworking processes. It discusses the mechanisms involved in adhesive, abrasive, chemical, and fatigue wear and key contributing factors, including the composition and structure of tool and workpiece materials, the characteristics of contact surfaces, and loading forces imposed by the process. It describes the nature of metal transfer between tool and workpiece surfaces and the role of lubricants, coatings, and textures. It also discusses the use of wear maps, the effects of adhesion, and material-lubricant interactions.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870085
EISBN: 978-1-62708-299-0
... of approximately 180° at the left edge in Fig. 4(a) . At the point at which this wear was observed, the combustion chamber was designed to have a nominal clearance from a concentric housing around it, with cooling water flowing through the intervening annular space. The region of maximum wear was on the same side...
Abstract
This chapter explains how mechanical processes, including erosion, cavitation, impingement, and fretting, contribute to the effects of corrosion in aluminum alloys. It describes the two main types of erosion-corrosion and the factors involved in cavitation and liquid impingement erosion along with testing and prevention methods. It also provides information on fretting corrosion and fretting fatigue.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030247
EISBN: 978-1-62708-282-2
... smooth Slug Annular wavy Moderate Extreme Straight pipe 3 100 200 10 Pipe with pitting 5 150 300 15 3D-bend 5 150 300 15 5 mm (0.2 in.) weld bead 10 350 700 25 Source: Ref 10 , 27 Currently, state-of-the-art in corrosion assessment utilizes...
Abstract
This chapter discusses the particular corrosion problems encountered and the methods of control used in petroleum production and the storage and transportation of oil and gas up to the refinery. It begins by describing those aspects of corrosion that tend to be unique to corrosion as encountered in applications involving oil and gas exploration and production. This is followed by a section reviewing the methods of corrosion control, namely the proper selection of materials, protective coatings, cathodic protection systems, use of inhibitors, use of nonmetallic materials, and control of the environment. The chapter ends with a discussion on the problems encountered and protective measures that are based on the state-of-the-art as practiced daily by corrosion and petroleum engineers and production personnel.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2023
DOI: 10.31399/asm.tb.edfatr.t56090003
EISBN: 978-1-62708-462-8
... and could not be improved further for the near-bandgap wavelengths where Si is transparent, although introduction of aplanatic SILs ( Ref 17 ) and annular apertures ( Ref 18 ) appeared promising for narrower applications with reduced optical bandwidth or sensitivity. On the positive side, the transistor...
Abstract
This chapter assesses the capabilities and limitations of electric fault isolation (EFI) technology, the measurement challenges associated with new device architectures, and the pathways for improvement in emission microscopy, laser stimulation, and optical probing. It also assesses the factors that influence signal strength, spatial and timing resolution, and alignment accuracy between signal response images and the physical layout of the IC.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610025
EISBN: 978-1-62708-303-4
... unequivocally from the torque. This is because the shear stress (τ) depends on γ, which varies with radial position. Therefore τ depends on r . Consider an annular element of radius r and width dr having an area 2π rdr . The contribution of this element to the total torque ( T ) is the product of the shear...
Abstract
This chapter discusses the stress-strain response of materials, how it is measured, and how it used to set performance expectations. It begins by describing the common tensile test and how it sheds light on the elastic design of structures as well as plasticity and fracture behaviors. It explains how engineering and true stress-strain curves differ, how one is used for design and the other for analyzing metal forming operations. It discusses the effect of holes, fillets, and radii on the distribution of stresses and the use of notch tensile testing to detect metallurgical embrittlement. The chapter also covers compression, shear, and torsion testing, the prediction of yielding, residual stress, and hardness.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740103
EISBN: 978-1-62708-308-9
.... This is especially important in forging of metals that rupture if subjected to high deformation rates. Parts can be forged using split dies to create offset flanges, projections, back draft, and other design features that are extremely difficult, if not impossible, to incorporate in hammer forgings. When...
Abstract
This chapter discusses bulk deformation processes and how they are used to reshape metals and refine solidification structures. It begins by describing the differences between hot and cold working along with their respective advantages. It then discusses various forging methods, including open-die and closed-die forging, hot upset and roll forging, high-energy-rate forging, ring rolling, rotary swaging, radial and orbital forging, isothermal and hot-die forging, precision forging, and cold forging. The chapter also includes information on cold and hot extrusion and drawing operations.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2023
DOI: 10.31399/asm.tb.edfatr.9781627084628
EISBN: 978-1-62708-462-8
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.9781627084598
EISBN: 978-1-62708-459-8
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110153
EISBN: 978-1-62708-247-1
... interfaces with the same expected surface finish. Removing a significant portion of the die substrate will usually affect the stability of the package. Proper planning of the entire backside analysis strategy is a requirement that is frequently trivialized at the peril of the project, as will be shown...
Abstract
The need for precise targeted interactive surgery on boards or modules is the main driver of backside preparation technology. This article assists the analyst in making decisions on backside thinning and polishing requirements. Thinning of the substrates can be accomplished by flat lapping, laser assisted chemical etch, plasma reactive ion etch, and CNC based milling and polishing. The article discusses the general characteristics, key principles, advantages, and disadvantages of these processes. It also contains case studies that illustrate the application of these processes to ceramic cavity devices, injection molded parts, and ball grid arrays.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200007
EISBN: 978-1-62708-354-6
... perform satisfactorily on tough construction projects where severe stresses are encountered. Fig. 2-56 Yoke casting for a road building tractor. Length 34 in. (860 mm), width 22 in. (560 mm), weight 355 lb (161 kg) Construction components include structural castings in bridges, dams, locks...
Abstract
Steel castings are produced in thousands of designs for different applications. They fill needs in many industries, including transportation, construction machinery, earthmoving equipment, rolling mills, mining, oil and gas exploration, and power generation. This chapter touches upon the variety of applications for which steel castings can be supplied and the ranges of casting size and complexity. Photographs in this chapter provide an understanding of these applications, their size and complexity, and the types of cast steels produced.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320031
EISBN: 978-1-62708-332-4
Abstract
This chapter discusses the crystal structures of steel and cast iron, the iron-iron carbide equilibrium diagram, microconstituents or phases in the iron-iron carbide phase diagram, the iron-carbon carbide-silicon equilibrium diagram of cast irons, and the influence on microstructure by base elements and alloying elements. Graphitization, cooling rates, and heat treatment effects are covered. There also is discussion on inoculation benefits, flake graphite types and typical applications, evolution of cast iron types, ASTM specification A247 for graphite shapes, and selection of the best molding process. A large table lists typical material choices for various applications.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860133
EISBN: 978-1-62708-348-5
..., about 27 times greater than at 100 K. For appropriately sized structural alloy specimens, this heat loss can be several percent of the total heat flow at 300 K even if the specimen is surrounded by a temperature-controlled shield. Normally one fills the annular space between the shield and the specimen...
Abstract
This chapter presents basic principles and the theoretical results of heat transport in solids. Thermal conductivity and thermal diffusivity are the principal properties discussed. Discussions are also included on the effects of temperature, magnetic field, and metallurgical variations caused by composition, processing, and heat-treatment differences. Numerous graphs illustrate the qualitative and quantitative effects of these variables. Measurement methods and associated accuracies and pertinent empirical correlations are presented.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
... and tears because of its low strength If the shell is pushed outward as an annular bead into the shrinkage gap, this can cause so much friction at the mold wall that transverse cracks occur (“cold shuts...
Abstract
This chapter explains the basic terminology and principles of metallurgy as they apply to extrusion. It begins with an overview of crystal structure in metals and alloys, including crystal defects and orientation. This is followed by sections discussing the development of the continuous cast microstructure of aluminum and copper alloys. The discussion provides information on billet and grain segregation and defects in continuous casting. The chapter then discusses the processes involved in the deformation of pure metals and alloys at room temperature. Next, it describes the characteristics of pure metals and alloys at higher temperatures. The processes involved in extrusion are then covered. The chapter provides details on how the toughness and fracture characteristics of metals and alloys affect the extrusion process. The weld seams in hollow profiles, the production of composite profiles, and the processing of composite materials, as well as the extrusion of metal powders, are discussed. The chapter ends with a discussion on the factors that define the extrudability of metallic materials and how these attributes are characterized.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060429
EISBN: 978-1-62708-261-7
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