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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Crystallographic Texture"”.
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Transformation Strain and Crystallographic Texture in Steels
… to calculate the transformation strain and texture during martensitic and bainitic transformations. The models are able to deal with a variety of complexities including various starting austenite textures and different states of externally applied stress. A variant selection model has been …
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Shape memory materials : crystallographic texture and its consequences
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Analysis of crystallographic texture information by the hyperspherical harmonic expansion
The field of texture analysis is fundamentally concerned with measuring and analyzing the distribution of crystalline orientations in a given polycrystalline material. Traditionally, the orientation distribution function describing crystallographic orientation information is written as a linear …
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Plastic deformation and crystallographic texture evolution in face-centered cubic metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Influence of crystallographic texture in X70 pipeline steels on toughness anisotropy and delamination
The effects of microstructure and crystallographic texture in four commercially-produced API X70 pipeline steels and their relation to planar anisotropy of toughness and delamination were evaluated. The experimental steels were processed through either a hot strip mill, a Steckel mill, or a compact …
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Modeling the Mechanical Response of Polycrystalline Thin Films
… polycrystalline films in MEMS often show fiber texture resulting in transverse isotropic elastic properties. It is of interest to determine these elastic properties, in particular the in-plane Young's modulus, since it plays a fundamental role in device performance. The fabrication process of …
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Microstructural evolution of sputtered phase segregated metal composite thin films
… we present the first comparative study of crystallographic texture development in three different types of metal thin film composites: fully miscible (Au-Ag), slightly immiscible (Cu-Ag) and immiscible (Au-SiO 2). Texture development refers to the distribution of orientations of …
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Study of residual stress in a thin platinum layer by means of nondestructive x-ray diffraction
… was used to investigate its microstructure. The crystallographic texture of the platinum was also examined by x-ray diffraction and displayed in pole figures.
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Deformation mechanisms in bulk nanostructured aluminum obtained after cryomilling and consolidation by spark plasma sintering
… strain, microstrain, crystallite size and crystallographic texture. During loading-unloading cycles we observe a lattice strain splitting between nc and UF volume fractions, a complete recovery of the peak broadening and a recovery of texture. These intriguing phenomena were explained to be …
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Plastic buckling in gas transmission line-pipes, cold formed from thermo-mechanically-controlled rolling of low-allow steel plates
… rolling processes, which introduce strong crystallographic texture and anisotropy in the pipes. The plates are then cold-formed into pipes, which introduces further anisotropy and residual stresses in the pipe. In the current work, effects of various steps of the pipe manufacturing process, …
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Synthesis and characterization of nanocrystalline alloys in the binary Ni-Co system/
… during plating was observed both to reduce the crystallographic texture of the Ni-Co alloys and to refine the grain structure. Owing to the low stacking fault energy of Co, many of the alloy deposits exhibited a large density of nanoscale twins. The unique dual-scale grain and nano-twin …
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Uncovering the link between twin-twin interactions and damage nucleation in an (α+β) Ti alloy
… twin activation is strongly dependent on initial crystallographic texture. The twinned domains are rotated such that prismatic slip is easier to activate, but prismatic slip transfer is unlikely across ~60° twin-twin boundaries due to geometric incompatibilities. The in-situ test revealed that a …
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Interrelationships of microstructure, stress and diffusion
… additional microstructural information, as the crystallographic texture, the density of crystalline defects, such as dislocations, and the crystal size can be acquired from the collected XRD data. This thesis is dedicated to the investigation of microstructural changes, residual stresses and …
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Solidification behavior and texture of laser-wire directed energy deposition of 316L austenitic stainless steel
… resulting in unique final microstructures and textures throughout AM builds. In this study, the solidification behavior and crystallographic texture of AM 316L produced using a laser-wire directed energy deposition (DED-LB) process was investigated and delta-ferrite morphology was utilized to …
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Constitutive equations for superelasticity in crystalline shape-memory materials
… orientations which approximate the initial crystallographic texture; (2) A simplified model using the Taylor assumption (1938) where each element represents a collection of single crystals at a material point. The macroscopic stress-strain responses are calculated as volume averages over the …
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Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
… were correlated with core loss, grain size, crystallographic texture, hysteresis characteristics and the amount of carbon content. The significant contribution of this thesis was to examine the influence of steel grade on tensile stress-response of Barkhausen noise. The experimental results …
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Modeling effects of microstructure for electrically active materials
… of the cathode. The effects of grain size and crystallographic texture of piezoelectric and electrostrictive materials is simulated for BaTiO₃ and PZN-PT. Results show that the high anisotropy of the underlying single-crystal properties enhances the macroscopic piezoelectric response with …
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A yield function to simulate earing in the deep drawing of aluminium
… during the drawing process. It is the result of crystallographic textures or preferred grain orientations that develop during the sheet rolling process. In polycrystalline materials it may be modelled via either crystallographic texture models or phenomenological yield surface models. …
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The mechanics of strain-induced crystallization in poly(ethylene terephthalate)
… nature and evolution of the crystallographic texture was studied using Wide Angle X-ray Diffraction (WAXD) measurements. The results of the mechanical tests, DSC and WAXD measurements indicated that straininduced crystallization does not occur in uniaxial compression at temperatures below the …
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Texture evolution in metal nitride (aluminum nitride, titanium nitride, hafnium nitride) thin films prepared by off-normal incidence reactive magnetron sputtering
<p>We studied the development of crystallographic texture in aluminum nitride (AlN), titanium nitride (TiN) and hafnium nitride (HfN) films deposited by off-normal incidence reactive magnetron sputtering at room temperature in N2/Ar mixtures. Texture measurements were performed by x-ray pole figure …
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