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Showing 1 to 20 of 27 for “"Transformation kinetics"”.
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Transformation kinetics of delta prime precipitation in aluminum-lithium alloys
Restriction data tranferred 2014-07-01T11:16:23-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission
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Formation and transformation kinetics of iron oxy-hydroxides and effects of adsorbed oxyanions
… (Lp). Although the Fh formation and transformation and oxyanion adsorption on its surface have been separately studied, the coupled interaction of these processes is only partly understood. The impact of oxyanion surface complexes on the rate and pathway of Fh transformation was …
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Mathematical Modeling of Reductive Transformation Kinetics of Branched Degradation Pathways of Groundwater Contaminants
… primarily by microbially catalyzed reductive transformation reactions. From a regulatory point of view, the capability to simulate the kinetics of these reductive transformation reactions coupled with other attenuation processes in the subsurface (e.g., sorption, advection, and dispersion) is …
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Effects of vanadium microalloying of 1080 steel on pearlite transformation kinetics and microstructural development
The effects of V alloying on the pearlite transformation kinetics and microstructure in 1080 steel were evaluated. Two industrial wire rod steels, 1080 and 1080V with a 0.035 wt pct V addition, were isothermally heat treated using dilatometry to assess pearlite transformation rates. A detailed …
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Optical and Electronic Properties, Nanoscale Structural Order, and Transformation Kinetics of Phase Change Materials
… that have greatly different crystallization kinetics. We provided clear evidence for the existence of nanoscale structural order in all amorphous states of Ge2Sb2Te5 and AgInSbTe, using Fluctuation electron microscopy (FEM) carried out in the transmission electron microscope. The nanoscale …
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Phase behavior and phase transformation kinetics during electrochemical cycling of lithium transition metal olivine compounds
… transport during the LiFePO4/FePO4 two-phase transformation during the charge-discharge process. This results initially in poor rate capability and making the practical utility of these compounds unclear. Numerous studies have attributed the rate capability of olivines purely to chemical …
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Combined effects of phosphorus and carbon on hardenability and phase transformation kinetics in 41xx steels, The
Includes bibliographical references.
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Development of Simultaneous Transformation Kinetics Microstructure Model with Application to Laser Metal Deposited Ti-6Al-4V and Alloy 718
… in turbine engines and undergo complex phase transformations, making them suited to developing a material model for laser metal deposition (LMD). The model uses simultaneous transformation kinetics (STK) theory to predict the transformation of one parent phase into several products. The model …
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Experimental investigation and constitutive modeling of the large deformation behavior of anisotropic steel sheets undergoing strain-induced phase transformation
The strain-induced phase transformation from austenite to martensite is responsible for the high strength and ductility of TRansformation-Induced Plasticity (TRIP)- assisted steels. The large deformation behavior of conventional steels is governed by crystallographic slip. In the case of TRIP …
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In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
… study in situ deformation mechanism like phase transformation and reorientation of variants was the main hindrance. But with development of modern diffraction technique, it has been possible to study deformation and correlate them with microstructure evolution. In this current work, we aim to …
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Process modeling for solidification microstructure and transient thermal stresses in laser aided DMD process
… Consequently, the effects of solid state phase transformations cannot be neglected. A complete model that provides a quantitative relationship between process parameters, phase transformation kinetics, solidification parameters, thermal stresses and microstructure is highly desirable. This …
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The constitutive modeling of shape memory alloys
… on basic concepts of thermodynamics and phase transformation kinetics. Compared with other developed constitutive relations, this thermomechanical constitutive relation not only reflects the physical essence of shape memory alloys, i.e., the martensitic phase transformation involved, but also …
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Modeling of materials with internal variables using a thermomechanical approach
… shape memory effect. A further refinement of the transformation kinetics expression for two-way shape memory is derived. It is demonstrated that the material parameters required by this model can be calculated or measured using a standard materials testing apparatus. A numerical study is conducted …
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A study of transient flow-induced crystallization of polymer melts
… provide an in-situ technique for monitoring the transformation kinetics both during and following flow. The use of a crystallizable droplet phase, suspended within a non-crystallizable carrier phase, prevents die blockage and allows for direct measure of the droplet phase kinematics. Both …
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High-strength transformation-induced plasticity steels with reverted interlath austenite
… methods are applied to increase the reversion kinetics: (i) changing the reversion mechanism from diffusive to displacive; (ii) changing the alloy composition to promote diffusive transformation. To promote local displacive austenite reversion, the enrichment of austenite stabilizer at the …
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Metallic MoS2 Nanosheets for Lithium-Sulfur Batteries
… °C in dry air—well above the conventional phase transformation temperature of ~100 °C. We establish that moisture is the primary degradation factor, enabling conventional fabrication methods in dry-room conditions rather than requiring costly fully inert environments. Second part of the thesis …
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Evaluating the Potential of Scaling due to Calcium Compounds in Hydrometallurgical Processes
… pH and concentration of ions present. The transformation between CaSO4 hydrates is one of the common causes of scale formation. A systematic study was carried out to investigate the effect of various parameters including temperature, acidity, seeding, and presence of sulphate/chloride salts …
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Understanding the effect of aluminium on the microstructure on low level nitrogen steel
… recently as a possible replacement for Si in Transformation Induced Plasticity (TRIP) steels. Although the effect of substitutional elements such as manganese and chromium has been investigated in detail in the last few decades, there has been little research concerned with the effect of Al as …
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Thermal expansion and phase transformation behavior in the rare-earth titanate system
… of information to describe a reconstructive transformation in this manner is unique and may be a new method to describe such transformations where few tools currently exist today. Additionally, a new experimental technique was developed to study the phase transformation kinetics between the …
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