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Journal articles on the topic 'Polycrystals Texture (Crystallography) Microstructure'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Hafok, Martin, and Reinhard Pippan. "Comparison of Single Crystalline and Polycrystalline Behavior under High Pressure Torsion." Materials Science Forum 550 (July 2007): 277–82. http://dx.doi.org/10.4028/www.scientific.net/msf.550.277.

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By using techniques of severe plastic deformation a metallic material can be subjected to an enormous strain that is not achievable by conventional methods of deformation. In this study nickel single crystals with different crystallographic orientation and nickel polycrystals were deformed by high pressure torsion. All nickel samples were processed up to the evolution of a saturation microstructure where no further hardening of the material can be observed. In this region all samples develop a similar microstructure and micro-texture. The differences in the fragmentation of the microstructure

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2

Duvvuru, Hari K., Marko Knezevic, Raja K. Mishra, and Surya R. Kalidindi. "Application of Microstructure Sensitive Design to FCC Polycrystals." Materials Science Forum 546-549 (May 2007): 675–80. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.675.

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Microstructure Sensitive Design (MSD) offers a rigorous mathematical framework for representing the relevant statistical details of the material microstructure for a given design problem, and for developing quantitative invertible relationships between these microstructure representations and the macroscale properties of interest. The methodology makes extensive use of Fourier representations of the distribution functions representing the material internal structure and existing homogenization theories. In this paper, we describe the application of the MSD framework to fcc polycrystals with a

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3

Faurie, D., O. Castelnau, R. Brenner, P. O. Renault, E. Le Bourhis, and Ph Goudeau. "In situdiffraction strain analysis of elastically deformed polycrystalline thin films, and micromechanical interpretation." Journal of Applied Crystallography 42, no. 6 (2009): 1073–84. http://dx.doi.org/10.1107/s0021889809037376.

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In situtensile tests have been carried out under synchrotron radiation on supported gold (Au) thin films exhibiting a pronounced crystallographic texture. The 2θ shift of X-ray diffraction lines has been recorded for different specimen orientations and several loading levels in the elastic domain. The data obtained demonstrate the large strain heterogeneities generated within the specimen because of the intergranular interactions associated with the large elastic anisotropy of Au grains. To interpret these results, the use of a multi-scale micromechanical approach is unavoidable. The theoretic

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4

Arruffat-Massion, R., S. Suwas, László S. Tóth, Werner Skrotzki, Jean-Jacques Fundenberger, and André Eberhardt. "Experiments and Modelling of ECAE Textures of f.c.c. Polycrystals." Materials Science Forum 495-497 (September 2005): 839–44. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.839.

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FCC metals with different stacking fault energy (SFE), namely Al, Ag and Cu have been investigated for the evolution of crystallographic texture during ECAE deformation using Route A. Different materials with different SFE result in their characteristic textures. The results have been analysed on the basis of microstructural features and related established concepts on texture evolution in FCC metals.

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Brahme, Abhijit P., Joseph M. Fridy, and Anthony D. Rollett. "Modeling Recrystallization in Aluminum Using Input from Experimental Observations." Materials Science Forum 558-559 (October 2007): 1057–61. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.1057.

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A model has been constructed for the microstructural evolution that occurs during the annealing of aluminum alloys. Geometric and crystallographic observations from two orthogonal sections through a polycrystal using automated Electron Back-Scatter Diffraction (EBSD) were used as an input to the computer simulations to create a statistically representative threedimensional model. The microstructure is generated using a voxel-based tessellation technique. Assignment of orientations to the grains is controlled to ensure that both texture and nearest neighbor relationships match the observed dist

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6

Engler, Olaf. "Modelling of Microstructure and Texture and the Resulting Properties during the Thermo-Mechanical Processing of Aluminium Sheets." Materials Science Forum 519-521 (July 2006): 1563–68. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1563.

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In order to predict the mechanical properties of Al sheet products, the evolution of microstructure and crystallographic texture along the process chain must be tracked. During the thermo-mechanical processing in commercial production lines the material experiences a complex history of temperature, time and strain paths, which results in alternating cycles of deformation and recrystallization with the associated changes in texture and microstructure. In the present paper the texture evolution of AA 3104 can body stock is modelled. In particular, the earing behaviour at final gauge is linked to

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7

Durand, Gaël, O. Gagliardini, Throstur Thorsteinsson, Anders Svensson, Sepp Kipfstuhl, and Dorthe Dahl-Jensen. "Ice microstructure and fabric: an up-to-date approach for measuring textures." Journal of Glaciology 52, no. 179 (2006): 619–30. http://dx.doi.org/10.3189/172756506781828377.

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AbstractAutomatic c-axes analyzers have been developed over the past few years, leading to a large improvement in the data available for analysis of ice crystal texture. Such an increase in the quality and quantity of data allows for stricter statistical estimates. The current textural parameters, i.e. fabric (crystallographic orientations) and microstructure (grain-boundary networks), are presented. These parameters define the state of the polycrystal and give information about the deformation undergone by the ice. To reflect the findings from automatic measurements, some parameter definition

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8

Lloyd, G. E., N. H. Schmidt, D. Mainprice, and D. J. Prior. "Crystallographic textures." Mineralogical Magazine 55, no. 380 (1991): 331–45. http://dx.doi.org/10.1180/minmag.1991.055.380.04.

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AbstractTo material scientists the term texture means the crystallographic orientation of grains in a polycrystal. In contrast, geologists use the term more generally to refer to the spatial arrangement or association of mineral grains in a rock. In this contribution we are concerned with the materials science definition. There are several established techniques available for the determination of crystallographic textures in rocks. It has also been realised that the scanning electron microscope (SEM) is applicable to the study of crystallographic textures via the electron channelling (EC) effe

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9

Engler, Olaf. "Simulation of Rolling and Recrystallization Textures in Aluminium Alloy Sheets." Materials Science Forum 550 (July 2007): 23–34. http://dx.doi.org/10.4028/www.scientific.net/msf.550.23.

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Computer-based alloy and process development requires integration of models for simulating the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. The present paper focuses on recent developments in linking softening modules that simulate the progress of recovery and recrystallization with the following texture changes to deformation and microchemistry models. The potential of such coupled simulations is illustrated by way of the thermo-mechanical processing of Al-Mn-Mg AA 3104 can stock. In particular, t

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10

Bastos, A., Stefan Zaefferer, and Dierk Raabe. "Orientation Microscopy on Nanostructured Electrodeposited NiCo-Films." Advanced Materials Research 15-17 (February 2006): 953–58. http://dx.doi.org/10.4028/www.scientific.net/amr.15-17.953.

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A Co-20at%Ni polycrystal produced by electrodeposition was studied in its detail using orientation microscopy. By analyzing the local crystallographic texture, grain morphology and the grain boundary character on three distinct sections of the film, we have obtained a complete understanding of its microstructure. The microstructure and grain morphology is very complex, consisting of grains elongated in deposit direction, clusters of coarse and fine grains and further very fine structures. The deposition parameters generate a strong (1120)//ND texture and the columnar grain reveals inner orient

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11

Bae, Jin Ho, Shi Hoon Choi, Ki Soo Kim, and Ki Bong Kang. "Study of Texture Development and Anisotropy of Mechanical Properties of API-X80 Line Pipe Steel for Spiral-Welded Pipe." Materials Science Forum 495-497 (September 2005): 531–36. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.531.

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This study has been conducted to analyze the effect of texture and microstructure on the anisotropy of yield strength and Charpy fracture toughness of an X80 line pipe steel. The texture and microstructure were investigated by X-ray diffractometer and electron backscattered diffraction (EBSD). The yield strength and impact energy were measured along 0o (longitudinal), 30o and 90o (transverse) to the rolling direction. It was found that the microstructure of the developed steel consisted of fine acicular and polygonal ferrite with small pearlite and martensite or retained austenite (MA constitu

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12

Buchheit, Thomas E., Jay D. Carroll, Blythe G. Clark, and Brad L. Boyce. "Evaluating Deformation-Induced Grain Orientation Change in a Polycrystal During In Situ Tensile Deformation using EBSD." Microscopy and Microanalysis 21, no. 4 (2015): 969–84. http://dx.doi.org/10.1017/s1431927615000677.

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AbstractUsing an in situ load frame within a scanning electron microscope, a microstructural section on the surface of an annealed tantalum (Ta) polycrystalline specimen was mapped at successive tensile strain intervals, up to ~20% strain, using electron backscatter diffraction. A grain identification and correlation technique was developed for characterizing the evolving microstructure during loading. Presenting the correlated results builds on the reference orientation deviation (ROD) map concept where individual orientation measurements within a grain are compared with a reference orientati

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13

Vu, Viet Q., Laszlo S. Toth, Yan Beygelzimer, and Yajun Zhao. "Microstructure, Texture and Mechanical Properties in Aluminum Produced by Friction-Assisted Lateral Extrusion." Materials 14, no. 9 (2021): 2465. http://dx.doi.org/10.3390/ma14092465.

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The Friction-Assisted Lateral Extrusion Process (FALEP) is a severe plastic deformation (SPD) technique for producing metal sheets from bulk metal or powder in one single deformation step at room temperature. In the present work, aluminum Al-1050 was deformed by FALEP. Then, its microstructure was examined by EBSD; the crystallographic texture by X-ray; material strength, ductility, and the Lankford parameter by tensile testing; the latter also by polycrystal plasticity simulations. It is shown that the microstructure was highly refined, with the grain size reduced more than 160 times down to

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14

Turner, T. J., and M. P. Miller. "Modeling the Influence of Material Structure on Deformation Induced Surface Roughening in AA7050 Thick Plate." Journal of Engineering Materials and Technology 129, no. 3 (2006): 367–79. http://dx.doi.org/10.1115/1.2744395.

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A methodology for incorporating a description of material structure into a finite element formulation is presented. This work describes an experiment/simulation - based methodology for characterizing attributes of material structure, and then incorporating those attributes into a modeling framework. The modeling framework was used to study the development of deformation induced surface roughening in thin sheets machined from AA 7050 thick plate. Predicting this roughening phenomenon necessitates the quantification and representation of material structure and processes that exist over several s

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15

Habiby, F., and F. J. Humphreys. "A Microstructure Investigation of the Deformation and Recrystallization of Particle-Containing Aluminium-Silicon Alloys." Textures and Microstructures 20, no. 1-4 (1993): 125–40. http://dx.doi.org/10.1155/tsm.20.125.

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Single crystals and polycrystals of aluminium containing non-deformable second-phase particles of silicon, have been deformed, and the resultant structures investigated by microscopy and by X-ray and microtexture techniques. The particle size is found to influence the scale of the deformation bands formed, and there is evidence that particles may affect the nucleation of these bands. The deformed materials were recrystallized, and the effect of particle stimulated nucleation on the weakening of the rolling texture is discussed with reference to a computer simulation. In contrast, the recrystal

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16

Journaux, Baptiste, Thomas Chauve, Maurine Montagnat, et al. "Recrystallization processes, microstructure and crystallographic preferred orientation evolution in polycrystalline ice during high-temperature simple shear." Cryosphere 13, no. 5 (2019): 1495–511. http://dx.doi.org/10.5194/tc-13-1495-2019.

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Abstract. Torsion experiments were performed in polycrystalline ice at high temperature (0.97 Tm) to reproduce the simple shear kinematics that are believed to dominate in ice streams and at the base of fast-flowing glaciers. As clearly documented more than 30 years ago, under simple shear ice develops a two-maxima c axis crystallographic preferred orientation (CPO), which evolves rapidly into a single cluster CPO with a c axis perpendicular to the shear plane. Dynamic recrystallization mechanisms that occur in both laboratory conditions and naturally deformed ice are likely candidates to expl

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17

Humphreys, F. J., and P. N. Kalu. "The Development of Microstructure and Texture During the Deformation and Annealing of Particle-Containing Polycrystals." Textures and Microstructures 14 (1991): 703–8. http://dx.doi.org/10.1155/tsm.14-18.703.

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18

Hartig, Ch, and H. Mecking. "Crystal Plastic Finite Element Simulation of Fe-Cu Polycrystals." Materials Science Forum 495-497 (September 2005): 1621–26. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1621.

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The plastic and elastic deformation of PM two-phase Iron-Copper polycrystals was studied experimentally and modelled by a FEM model calculation, taking into account anisotropic elasticity and crystal plasticity. Following quantities were experimentally measured and calculated by a FEM model calculation: A local strain distribution and rolling textures. For a judgement of model predictions the orientation densities of the bcc a-fibres of Iron and of the fcc b-fibres of Copper were considered. Good predictions of the texture evolution were found in cases only, where local micromechanical interac

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19

Vuppala, Aditya, Alexander Krämer, and Johannes Lohmar. "On Sampling Discrete Orientations from XRD for Texture Representation in Aggregates with Varying Grain Size." Crystals 11, no. 9 (2021): 1021. http://dx.doi.org/10.3390/cryst11091021.

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The amount of orientation difference of crystallites, i.e., the texture in a metallic polycrystal governs, plastic anisotropy, electrical and magnetic properties of the material. For simulating the microstructure and texture evolution during forming processes, representative volume elements (RVEs) often generated based on experimental measurements are commonly used. While the grain size and morphology of polycrystals are often determined via light-optical microscopy, their texture is conventionally analyzed through diffraction experiments. Data from these different experiments must be correlat

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20

Miller, M. P., and N. R. Barton. "Representing the Effect of Crystallographic Texture on the Anisotropic Performance Behavior of Rolled Aluminum Plate." Journal of Engineering Materials and Technology 122, no. 1 (1999): 10–17. http://dx.doi.org/10.1115/1.482759.

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Rolled aluminum alloys are known to be anisotropic due to their processing histories. This paper focuses on measuring and modeling monotonic and cyclic strength anisotropies as well as the associated anisotropy of the elastic/elastic-plastic transition of a commercially-available rolled plate product. Monotonic tension tests were conducted on specimens in the rolling plane of 25.4 mm thick AA 7075-T6 plate taken at various angles to the rolling direction (RD). Fully-reversed tension/compression cyclic experiments were also conducted. As expected, we found significant anisotropy in the back-ext

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21

Faria, Sérgio H., Gilberto M. Kremer, and Kolumban Hutter. "On the inclusion of recrystallization processes in the modeling of induced anisotropy in ice sheets: a thermodynamicist’s point of view." Annals of Glaciology 37 (2003): 29–34. http://dx.doi.org/10.3189/172756403781815519.

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AbstractIn spite of the clear fact that annealing and recrystallization phenomena in ice sheets have their roots in the thermodynamics of polycrystalline media, most approaches seem to neglect it by proposing ad hoc theories which can eventually violate fundamental thermodynamic principles. The current work presents a useful fusion of modern concepts from the thermodynamics of mixtures with continuous diversity with recent developments in the modeling of induced anisotropy and recrystallization in ice sheets. The fabric (also called texture) of the medium is described by a continuous distribut

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22

Alias, Juliawati, Wan Sharuzi Wan Harun, and Hassan Mas Ayu. "A Review on the Preparation of Magnesium-Based Alloys Prepared by Powder Metallurgy and the Evolution of Microstructure and Mechanical Properties." Key Engineering Materials 796 (March 2019): 3–10. http://dx.doi.org/10.4028/www.scientific.net/kem.796.3.

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This paper reviews the manufacturing of magnesium-based alloys prepared by powder metallurgy (PM) technique and analysis of the effects of PM parameter on the developed microstructure, texture and mechanical properties. Powder metallurgy (PM) technique has been considered to produce magnesium product with consideration of less complex, finer grain and improved mechanical properties. Selection of PM route especially sintering to full densification determines a good diffusion path of alloy for interparticle bonding. This paper discusses the preparation and process parameter of each process in po

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23

Marx, V., D. Raabe, O. Engler, and G. Gottstein. "Simulation of the Texture Evolution During Annealing of Cold Rolled Bcc and Fcc Metals Using a Cellular Automation Approach." Textures and Microstructures 28, no. 3-4 (1997): 211–18. http://dx.doi.org/10.1155/tsm.28.211.

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In this study both primary static recrystallization and static recovery of cold rolled bcc and fcc metals and alloys are numerically simulated using a three-dimensional model that is based on a modified cellular automaton approach. The model considers the influence of the initial deformation texture and microstructure on both static recovery and primary static recrystallization with a high spatial resolution. The cellular automat technique provides both local and statistical information about the kinetics, the morphology and the texture change during annealing. The influence of nucleation and

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24

Nakai, Hiroto, Masanao Inokoshi, Kosuke Nozaki, et al. "Additively Manufactured Zirconia for Dental Applications." Materials 14, no. 13 (2021): 3694. http://dx.doi.org/10.3390/ma14133694.

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We aimed to assess the crystallography, microstructure and flexural strength of zirconia-based ceramics made by stereolithography (SLA). Two additively manufactured 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP: LithaCon 3Y 230, Lithoz; 3D Mix zirconia, 3DCeram Sinto) and one alumina-toughened zirconia (ATZ: 3D Mix ATZ, 3DCeram Sinto) were compared to subtractively manufactured 3Y-TZP (control: LAVA Plus, 3M Oral Care). Crystallographic analysis was conducted by X-ray diffraction. Top surfaces and cross-sections of the subsurface microstructure were characterized using scan

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Shang, Peng-Peng, Jinfeng Dong, Jun Pei, et al. "Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance." Research 2019 (November 11, 2019): 1–10. http://dx.doi.org/10.34133/2019/9253132.

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Thermoelectric materials, which directly convert heat into electricity based on the Seebeck effects, have long been investigated for use in semiconductor refrigeration or waste heat recovery. Among them, SnSe has attracted significant attention due to its promising performance in both p-type and n-type crystals; in particular, a higher out-of-plane ZT value could be achieved in n-type SnSe due to its 3D charge and 2D phonon transports. In this work, the thermoelectric transport properties of n-type polycrystalline SnSe were investigated with an emphasis on the out-of-plane transport through pr

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26

Castelnau, Olivier, Philippe Goudeau, G. Geandier, et al. "White Beam Microdiffraction Experiments for the Determination of the Local Plastic Behaviour of Polycrystals." Materials Science Forum 524-525 (September 2006): 103–8. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.103.

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The overall plastic behavior of polycrystalline materials strongly depends on the microstructure and on the local rheology of individual grains. The characterization of the strain and stress heterogeneities within the specimen, which result from the intergranular mechanical interactions, is of particular interest since they largely control the microstructure evolutions such as texture development, work-hardening, damage, recrystallization, etc. The influence of microstructure on the effective behavior can be addressed by physical-based predictive models (homogenization schemes) based either on

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27

Estrada-Martínez, José Antonio, David Hernández-Silva, and Talal Al-Samman. "Hot Rolling of Magnesium Single Crystals." Metals 11, no. 3 (2021): 443. http://dx.doi.org/10.3390/met11030443.

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To analyze the effect of the initial orientation in the activity of twinning and texture development, magnesium single crystals were rolled at 400 °C (nominal furnace temperature) in two specific orientations. In both orientations, the rolling direction of the sheet (RD) was parallel to the c-axis. For orientation 1, the 112¯0 direction was parallel to the normal direction (ND), and for orientation 2, it was parallel to the 101¯0 direction. The samples were rolled at 30%, 50% and 80% of thickness reduction. After rolling, all the samples were quenched in water to retain the microstructure. The

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28

Briffod, Fabien, Takayuki Shiraiwa, and Manabu Enoki. "Numerical investigation of the influence of rolling texture and microstructure on fatigue crack initiation in BCC polycrystals." International Journal of Fatigue 107 (February 2018): 72–82. http://dx.doi.org/10.1016/j.ijfatigue.2017.10.019.

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29

Rodrigues, Daniella Gomes, Cláudio Moreira Alcântara, Dagoberto Brandão Santos, Tarcísio Reis de Oliveira, and Berenice Mendonça Gonzalez. "Effect of Previous Grain Size on Recystallization Texture and the Formability of the Nb Ferritic Stainless Steel." Materials Science Forum 879 (November 2016): 1594–99. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1594.

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The ferritic stainless steels are materials used in several segments due to the excellent combination of mechanical properties and corrosion resistance. The mechanical properties of these alloys are strongly dependent on the microstructural characteristics and crystallography texture. The aim of this experimental study is to investigate the roles of the grain size of the hot rolled sample on the development of the microstructure, texture and formability of ferritic stainless steel. The main elements of chemical composition of the steel under investigation were 16.0 %Cr, 0.021 %C, 0.024 %N and

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30

Chulist, Robert, Andrea Böhm, Thomas Lippmann, Werner Skrotzki, Welf Guntram Drossel, and Reimund Neugebauer. "Twinning Behaviour of Textured Polycrystalline Ni-Mn-Ga Alloy after Hot Extrusion." Materials Science Forum 635 (December 2009): 195–99. http://dx.doi.org/10.4028/www.scientific.net/msf.635.195.

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Up to now most of the research on Ni-Mn-Ga alloys was concentrated on single crystals. However, there is a great interest in polycrystals for technical applications. Recently, polycrystalline Ni50Mn29Ga21 rods of 25 mm diameter and 400 mm length were prepared by hot extrusion. The <100> <110> double fibre texture of the extruded rods was measured with high-energy synchrotron radiation. The microstructure after hot extrusion was analyzed with electron backscatter diffraction. Within the recrystallized grains all three martensitic variants have developed during cooling. Variants with

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Prior, David J., Michel Bestmann, Angela Halfpenny, et al. "Recrystallization and Grain Growth in Rocks and Minerals." Materials Science Forum 467-470 (October 2004): 545–50. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.545.

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Misorientation analysis, using EBSD data sets, has enabled us to constrain better recrystallization mechanisms in rocks and minerals. Observed microstructures are not explicable in terms of recovery, boundary bulging and migration alone. We have to invoke either a nucleation process (physics unknown) or grain rotations that are not related to grain or boundary crystallography. Such rotations can occur by diffusion accommodated grain boundary sliding and this mechanism explains best the microstructure and texture of recrystallized grains in some rocks.

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32

Serrano-Zabaleta, S., A. Larrea, A. Larrañaga, and E. C. Dickey. "Microstructure, texture, and crystallography in Ni–GDC and Co–GDC porous cermets obtained from directionally solidified eutectic ceramics." Journal of Materials Science 52, no. 10 (2016): 5477–88. http://dx.doi.org/10.1007/s10853-016-0225-9.

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Paul, Henryk, Adam Morawiec, Emmanuel Bouzy, Jean-Jacques Fundenberger, and Andrzej Piątkowski. "Shear Banding in Twinned Structures and Their Influence on Brass-Type Texture." Materials Science Forum 495-497 (September 2005): 1067–72. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1067.

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The local crystallography within shear bands (SB) has been examined in a single crystal of {112}<111> orientation of pure copper deformed at 77K by channel-die compression to strains of about 1. Setting up a system for making high-resolution orientation maps using transmission electron microscopy (TEM) has opened new advantageous circumstances for the analysis of orientation changes within SB. This method with spatial resolution higher than 10nm allows the examination of microstructure images composed of nanoscale subcells forming SB. It has been found that for well-developed shear bands

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Fréour, Sylvain, Emmanuel Lacoste, Manuel François та Ronald Guillén. "Determining Ti-17 β-Phase Single-Crystal Elasticity Constants through X-Ray Diffraction and Inverse Scale Transition Model". Materials Science Forum 681 (березень 2011): 97–102. http://dx.doi.org/10.4028/www.scientific.net/msf.681.97.

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The scope of this work is the determination of single-crystals elastic constants (SEC) from X-ray diffraction lattice strains measurements performed on multi-phase polycrystals submitted to mechanical load through a bending device. An explicit three scales inverse self-consistent model is developed in order to express the SEC of a cubic phase, embedded in a multi-phase polycrystal, as a function of its X-ray Elasticity Constants. Finally, it is applied to a two-phases (α+β) titanium based alloy (Ti-17), in order to estimate Ti-17 β-phase unknown SEC. The purpose of the present work is to accou

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35

Drown, J. L., S. M. Merchant, M. E. Gross, D. Eaglesham, L. A. Giannuzzi, and R. B. Irwin. "Comparison of Sputtered Titanium Nitride on Silicon Dioxide and Aluminum-Alloy Thin Films." Microscopy and Microanalysis 3, S2 (1997): 469–70. http://dx.doi.org/10.1017/s1431927600009235.

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Titanium nitride (TiN) films are used as anti-reflection coatings (ARC) on aluminum (Al) films to facilitate lithography processes during multilevel metallization for the manufacture of integrated circuits on silicon-based (Si) semiconductor devices. It is generally accepted in the literature that the microstructure of multilevel metal stacks is influenced by the texture of the substrate. For the case of interconnect materials used in the semiconductor industry, a typical metal stack is as follows: Titanium/Titanium Nitride/Al-alloy/ARC-Titanium Nitride. The Ti/TiN layer underneath the Al-allo

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Prasad, Kartik, Mitsuki Obana, Yuki Ishii, Atsushi Ito, and Shiro Torizuka. "The effect of laser scanning strategies on the microstructure, texture and crystallography of grains exhibiting hot cracks in additively manufactured Hastelloy X." Mechanics of Materials 157 (June 2021): 103816. http://dx.doi.org/10.1016/j.mechmat.2021.103816.

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37

Burbery, N. B., G. Po, R. Das, N. Ghoniem, and W. G. Ferguson. "Dislocation dynamics in polycrystals with atomistic-informed mechanisms of dislocation - grain boundary interactions." Journal of Micromechanics and Molecular Physics 02, no. 01 (2017): 1750003. http://dx.doi.org/10.1142/s2424913017500035.

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In polycrystalline materials, dislocations can interact with grain boundaries (GBS) through a number of mechanisms including dislocation absorption, pile-up formation, dissociation reactions within the GB plane and (possibly) dislocation nucleation from the interface itself. The effects of dislocation pile-ups contribute significantly to the mechanical behavior of polycrystalline materials by creating back-stresses that inactivate the primary slip systems in the vicinity of the interface, corresponding with the celebrated Hall–Petch relationship between size and strength. However, dislocation

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van Houtte, Paul, Albert Van Bael, and Marc Seefeldt. "Multiscale Modelling of Plastic Deformation of Polycrystals: Implementation of Texture-Based Anisotropy in Engineering Applications (FE Codes for Forming, Prediction of Forming Limit Curves)." Materials Science Forum 539-543 (March 2007): 3454–59. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3454.

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Finite element models for metal forming are used to design and optimise industrial forming processes. The limit strain in sheet metal forming can be predicted for monotonic loading or strain paths with changes. Models like these should be as accurate as possible in order to be useful, and hence take the texture, microstructure and substructure (dislocation patterns) into account. To achieve this, a hierarchical type of modelling is proposed in order to maintain the balance between calculation speed (required for engineering applications) and accuracy. In that case, FE models to be used at the

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Hamandi, Farah, Gerard Simon, Richard Laughlin, and Tarun Goswami. "Biomechanical Behavior of a Variable Angle Locked Tibiotalocalcaneal Construct." Bioengineering 7, no. 1 (2020): 27. http://dx.doi.org/10.3390/bioengineering7010027.

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This paper examines the mechanics of the tibiotalocalcaneal construct made with a PHILOS plating system. A failed device consisting of the LCP plate and cortical, locking, and cannulated screws was used to perform the analysis. Visual, microstructure, and fractographic examinations were carried out to characterize the fracture surface topology. These examinations revealed the presence of surface scratching, inclusions, discoloration, corrosion pits, beach marks, and cleavage and striations on the fracture surface. Further examination of the material crystallography and texture revealed an inte

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Javaheri, Vahid, Nasseh Khodaei, Tun Tun Nyo, and David A. Porter. "Induction Hardening of a 0.40 % C Novel Microalloyed Steel: Effects of Heating Rate on the Prior Austenite Grain Size." Materials Science Forum 941 (December 2018): 64–70. http://dx.doi.org/10.4028/www.scientific.net/msf.941.64.

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This work explores the effect of heating rate on the prior austenite grain size and hardness of a thermomechanically processed novel niobium-microalloyed 0.40 % carbon low-alloyed steel intended for use in induction hardened slurry pipelines. The aim was to identify the heating rates that lead to the maximum hardness, for high wear resistance, and minimum prior austenite grain size, for high toughness. For this purpose, a Gleeble 3800 machine has been employed to simulate the induction hardening process and provide dilatometric phase transformation data. The prior austenite grain structure has

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Grammatikopoulos, Panagiotis, and Robert Charles Pond. "Identifying the multiplicity of crystallographically equivalent variants generated by iterative phase transformations in Ti." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 72, no. 1 (2016): 67–74. http://dx.doi.org/10.1107/s2052520615021897.

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This work describes phase transformations in Ti from a purely crystallographic perspective. Iterative heating and cooling above and below 1155 K induce phase transitions between a low-temperature h.c.p. (hexagonal close packed) ({6 \over m}mm) and a high-temperature b.c.c. (body centred cubic) (m\bar 3m) structure. The crystallography of the two phases has been found to be related by the Burgers Orientation Relationship (Burgers OR). The transitions are accompanied by changes in texture, as an ever-increasing number of crystallographically equivalent variants occur with every cycle. Identifyin

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Farrell, Shannon Patrick, Patti E. Quigley, Kyle J. Avery, Tim D. Hatchard, Stephanie E. Flynn, and Richard A. Dunlap. "Magnetostrictive Fe-Ga Wires with <100> Fiber Texture." MRS Proceedings 1129 (2008). http://dx.doi.org/10.1557/proc-1129-v01-02.

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AbstractRecently, low-cost processing approaches that produce textured thin bodies have engendered interest as cost-effective approaches for fabrication of magnetostrictive Fe-Ga alloys. In particular, wire-forming methods that strictly control the solidification direction could lead to some measure of crystallographic texture control. This is critical for development of large magnetostriction in polycrystals and for use of the alloys in actuators, sensors, energy harvesters and other systems. Magnetostrictive Fe-Ga wires have been prepared using an innovative cost-effective approach – based o

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Peralta, P., L. Llanes, A. Czapka, and C. Laird. "Microstructural Effects on the Cyclic Deformation of Polycrystalline FCC Materials." MRS Proceedings 362 (1994). http://dx.doi.org/10.1557/proc-362-181.

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AbstractThe effect of crystallographic texture and grain size on the cyclic hardening of FCC polycrystals was studied using copper as a model material. Samples with textures approximately random and two grain sizes were tested under cyclic loading. The cyclic response for high values of the plastic strain amplitude of the random-textured material was softer than that of polycrystals with strong <111>-<100> texture reported in [1], and almost the same at low plastic strains, when similar testing conditions were used. The cyclic behavior of specimens with different grain sizes and si

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Tränkner, Christine, Aurimas Pukenas, Jelena Horky, Michael Zehetbauer, and Werner Skrotzki. "Peculiarities in the Texture Formation of Intermetallic Compounds Deformed by High Pressure Torsion." MRS Proceedings 1760 (2014). http://dx.doi.org/10.1557/opl.2014.963.

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ABSTRACTNiAl, YCu and TiAl polycrystals with B2 and L10 structure, respectively, have been deformed by high pressure torsion (HPT) at temperatures between 20°C and 500°C at a hydrostatic pressure of 8 GPa to high shear strains. Local texture measurements were done by diffraction of high-energy synchrotron radiation and X-ray microdiffraction. In addition, the microstructure was analyzed by electron backscatter diffraction (EBSD). Besides typical shear components an oblique cube component is observed with quite large rotations about the transverse direction. Based on the temperature dependence

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Segurado, Javier, and Ricardo A. Lebensohn. "An FFT-based approach for Bloch wave analysis: application to polycrystals." Computational Mechanics, July 24, 2021. http://dx.doi.org/10.1007/s00466-021-02055-9.

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AbstractA method based on the Fast Fourier Transform is proposed to obtain the dispersion relation of acoustic waves in heterogeneous periodic media with arbitrary microstructures. The microstructure is explicitly considered using a voxelized Representative Volume Element (RVE). The dispersion diagram is obtained solving an eigenvalue problem for Bloch waves in Fourier space. To this aim, two linear operators representing stiffness and mass are defined through the use of differential operators in Fourier space. The smallest eigenvalues are obtained using the implicitly restarted Lanczos and th

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Choe, G., and S. J. Chung. "Effects of Microstructure and Crystallography on the Magnetic Properties of CoCrPt/Cr Thin Films." MRS Proceedings 343 (1994). http://dx.doi.org/10.1557/proc-343-321.

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ABSTRACTThe effects of grain morphology and crystallography on the magnetic properties of CoCrPt/Cr thin films were investigated as a function of sputtering parameters of CoCrPt thin films. Cross sectional TEM exhibited strong separation of Co grains with increasing argon sputtering pressure, resulting in reduced exchange coupling and increased coercivity. Most Co grains sputtered at high pressure were separated by 10 to 20 Å thick boundaries, possibly due to the enhanced scattering of argon ions by sputtering particles and thus the observed higher content of Pt in the deposited films. The app

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Desphande, Anirudha, and Jorg Wiezorek. "Cold-Deformation and Annealing of equiaxed L1o-ordered FePd Intermetallics." MRS Proceedings 980 (2006). http://dx.doi.org/10.1557/proc-980-0980-ii03-06.

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AbstractThe L10 ordering equiatomic intermetallic FePd has been used as a model system for the investigation of the evolution of microstructure and properties during annealing at temperatures below the ordering temperature after deformation in the L10 state. The two different routes for the preparation of equiaxed L10 FePd polycrystals, annealing after cold deformation in the disordered FCC state or after cold deformation in the ordered state, produce similar grain size distributions, differ in the transformation kinetics and importantly in the sequence of texture evolution during the post-col

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Maniatty, Antoinette M., David J. Littlewood, and Jing Lu. "Polycrystal Simulations Investigating the Effect of Additional Slip System Availability in a 6063 Aluminum Alloy at Elevated Temperature." Journal of Engineering Materials and Technology 130, no. 2 (2008). http://dx.doi.org/10.1115/1.2884338.

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In order to better understand and predict the intragrain heterogeneous deformation in a 6063 aluminum alloy deformed at an elevated temperature, when additional slip systems beyond the usual octahedral slip systems are active, a modeling framework for analyzing representative polycrystals under these conditions is presented. A model polycrystal that has a similar microstructure to that observed in the material under consideration is modeled with a finite element analysis. A large number of elements per grain (more than 1000) are used to capture well the intragranular heterogeneous response. Th

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