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Showing 1 to 20 of 123 for “"Microstructural Evolution"”.
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The microstructural evolution of fatigue cracks in FCC metals
The microstructural evolution during fatigue crack propagation was investigated in a variety of planar and wavy slip FCC metals. The planar materials included Haynes 230, Nitronic 40, and 316 stainless steel, and the wavy materials included pure nickel and pure copper. Three different sets of …
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Microstructural Evolution in Refractory Metal Multi-Component Alloy Systems
… two linked objectives. First, it clarifies the microstructural formation pathway in RSA system by applying an in situ synchrotron diffraction diffracted-spot tracing approach to follow phase evolution during controlled thermal histories. Across AlTaTiZr and the canonical AlMoNbTaTiZr alloy, the …
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Microstructural evolution of silicate immiscible liquids in solidifying ferrobasalts
… in ferrobasaltic magmas. Quantification of the microstructural evolution of an emulsion in ferrobasaltic experiments shows that the Fe-rich liquid forms homogeneously nucleated droplets dispersed in an immiscible Si-rich liquid, together with droplets heterogeneously nucleated on plagioclase, …
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Thermal imaging of quenched microstructural evolution in steel alloys
A method was devised for quenching undercooled samples of Fe-12Cr-16Ni. The samples were levitated in a magnetic field as a way of containerless processing. They were dropped onto a nucleation trigger and then into a quenching bath. This process was successful in producing quenched samples , but …
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Atomistic calculations of rate of long-timescale microstructural evolution
… for the study of materials phenomena. However, microstructural evolution in complex materials is only meaningfully characterized in laboratory or industry applications by deformation rate and relevant rate coefficients, quantities that require sampling over a timescale too large for traditional …
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Microstructural evolution of sputtered phase segregated metal composite thin films
… in comparison the texture and microstructure evolution in metal composite systems through x-ray diffraction pole figures. Our thin film materials were codeposited at room temperature by magnetron sputtering. Each of these composite metal systems shows a different behavior as determined by the …
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Microstructural evolution of zirconium carbide (ZrCₓ) ceramics under irradiation conditions
<p>A comprehensive understanding of the microstructural evolution of Zirconium Carbide (ZrC<sub>2</sub>) ceramics under irradiation conditions is required for their successful implementation in advanced Gen-IV gas-cooled nuclear reactors. The research presented in this dissertation focusses on …
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Microstructural evolution of epitaxial dielectric films derived from chemical precursors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Microstructural evolution and physical behavior of a lithium disilicate glass-ceramic
… temperatures were evaluated to investigate the microstructural changes. For each group, the crystalline phases and morphologies were measured by X-ray diffraction (XRD) and scanning electron microscope (SEM) respectively. Differential scanning calorimeter (DSC) was used to determine the …
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Grain size control and microstructural evolution in nanocrystalline Ni-W alloys
Nanocrystalline materials have been studied extensively over the past two decades because of their useful and interesting physical properties. In most cases, these properties derive from the fine characteristic length scale of nanocrystalline structures and are superior to those realized in …
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Investigation of microstructural evolution by real-time SEM of high-temperature specimens.
This thesis presents the results of a project to investigate the growth of grains and movement of grain boundaries in face centred cubic metals, using Environmental Scanning Electron Microscopy (ESEM).The original aim proved impractical without considerable modification to the microscope technique. …
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Microstructural evolution and mechanical properties of induction heated low carbon sheet steel
Includes bibliographical references (pages 90-92).
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Hybrid paradigm for modeling microstructural evolution under the influence of stress, A
Includes bibliographical references (pages 144-152).
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Microstructural evolution of AISI304 stainless steel in the Steckel Mill rolling process
The microstructural evolution of AISI304 stainless steel in the Steckel mill rolling process is investigated. This study includes the analysis of mill logs, microstructural examination of the mill product, deformation simulations and post deformation heat treatments. The mill logs from industry …
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Microstructural evolution during the homogenization heat treatment of 6XXX and 7XXX aluminum alloys
… step in the processing of aluminum extrusions. Microstructural evolution during homogenization involves elimination of the eutectic morphology by spheroidisation of the interdendritic phases, minimization of the microsegregation across the grains through diffusion, dissolution of the low-melting …
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Irradiation-Induced Microstructural Evolution and Mechanical Properties in Iron With and Without Helium
… of nanohardness to yield strength. The microstructural results from KMC modeling were also related to the mechanical properties through the Dispersed Barrier Model. (2) KMC was identified as a complementary technique for microstructural evaluation since it resulted in a distribution of …
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Molecular Dynamics Study of Microstructural Evolution in Alloys Subjected to Severe Plastic Deformation
… has been analyzed in new depths by tracking the evolution of pair of marker atoms. This analysis has proved to be a powerful tool in identifying the deformation mechanisms, including the glide of leading and trailing partial dislocations, and vacancy assisted atomic jumps during deformation, as …
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Microstructural Evolution in Thermally Cycled Large-Area Lead and Lead-Free Solder Joints
… The objective of this thesis is to observe microstructural change in large-area solder joints caused by thermal cycling and relate these changes to reliability issues in large-area lead and lead-free solder constructed semiconductor power devices. This study focused on the microstructural …
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Study of Pore Development in Silicon Oxycarbide Ceramics to Understand the Microstructural Evolution
Silicon oxycarbide (SiOC) is a ceramic obtained through the heating of a polymer precursor, which undergoes partial decomposition to go from an organic polymer to an inorganic ceramic. The microstructure of SiOC is not uniform at the nanometer scale, and contains nanometer sized silicon dioxide, …
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