Global ETD Search
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 282 for “"phase transformation"”.
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Electrochemically driven phase transformation in energy storage compounds
… many energy storage compounds undergo phase transitions in-situ, including the production of metastable phases. Unique to this environment is the frequent application of electrical over- and underpotentials, which are the electrical analogs to undercooling and superheating. So far, …
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Dispersed-phase transformation toughening in ultrahigh-strength steels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Microstructural formations and phase transformation pathways in tantalum carbides
… (TaC) and its sub-stoichiometric Ta2C and Ta4C3 phases have emerged as candidate materials for ultra-high temperature structural applications. A consequence of the high melting temperature is the limiting methods to fabricate near-net shape, near full density tantalum carbides. In general, …
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Quantification of phase transformation in stainless steel 301LN sheets
… by the initial anisotropy combined with the phase transformation during deformation. Stainless steel offers high strength with relatively high ductility as compared with other structural steels. The effect of initial anisotropy on the strength in different material directions is studied in …
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Effects of Polymers on Carbamazepine cocrystals phase transformation and release profiles
… the effects of coformers and polymers on the phase transformation and release profiles of cocrystals. Pharmaceutical cocrystals of Carbamazepine (CBZ) (namely 1:1 carbamazepine-nicotinamide (CBZ-NIC), 1:1 carbamazepine-saccharin (CBZ-SAC) and 1:1 carbamazepine-cinnamic acid (CBZ-CIN) …
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The effects of annealing on phase transformation in platinum-molybdenum coatings
… is due to the fact that the formation of ordered phases increases the strength and surface hardness and could also have an impact on surface activity and chemical properties. The changes in mechanical, physical and chemical properties could be of significant importance in enhancing the performance …
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Structure and Phase Transformation of Nanocrystalline and Amorphous Alloy Thin Films
The systematic study on the structure and morphology of Ag-Si alloy thin films shows nanocrystalline Ag clusters embedded in amorphous Si matrix for samples of different compositions and thicknesses. Ag cluster sizes increase from 2.5 nm to 3.5 nm as annealing temperature increases from room …
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Designing Microstructure through Reverse Peritectoid Phase Transformation in Ni₃Mo Alloy
… for 100h sintering followed by quenching. Three transformation studies were performed. First, the intermetallic γ-Ni₃Mo was formed from the supersaturated solution at temperatures ranging between 600°C and 900°C for up to 100h. The 100% stable γ-Ni₃Mo phase was formed at 600°C after 100h, while …
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Thermal expansion and phase transformation behavior in the rare-earth titanate system
… CTEAS for the cubic, orthorhombic, and hexagonal phases. In the cubic phase, the thermal expansion behavior was found to increase as expected with an increase in thermal vibrations. The orthorhombic phase exhibited an interesting shift from an expanding c-axis to one which contracted. Subsequent …
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Growth, phase transformation, and self-assembly in iron oxide and uranium oxide nanostructures
… mechanisms that drive nanoparticle growth, phase transformation, and assembly into larger structures are still shrouded in mystery. Considerable progress has been made in elucidating these mechanisms in the past several decades, and a comprehensive picture of nanoparticle growth is closer …
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The effect of phase transformation on fatigue crack growth of shape memory alloys
… growth are based on materials that don’t undergo phase transformation when an external force is applied. Consequently, the change of crack tip driven force due to phase transformation is not well understood. In this study, the modification of the crack tip driven force was characterized by the …
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Effect of Nonequilibrium Defects Due to Phase Transformation on Diffusion in Beta Zirconium
The effect of the hcp(--->)bcc phase transformation on the anomalous diffusion characteristics of bcc zirconium has been investigated in this study. ('113)Sn and ('59)Fe tracers were used to typify the diffusing nature of self- and fast-diffusing atoms. A differential measurement of diffusion in …
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The microstructure and some phase transformation characteristics of the dual phase steel 3CR12
… metallography have been used to establish the phase transformation diagram of a steel containing 12% chromium and 0,03% carbon. A dual phase material with attractive mechanical properties and adequate corrosion resistance can be achieved by careful control of alloy content and heat treatment. …
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Mechanics of Phase Transformation in NiTi Shape Memory Alloys at The Atomistic Scale
… their crystallographic structure by a displacive phase transformation between a high-symmetry austenite phase and a low-symmetry martensite phase, in response to either mechanical or thermal loading. These properties make them a superior candidate for using as damping materials under …
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The effect of temperature on phase transformation mechanisms in electrodes for Li-ion batteries
The effect of elevated temperatures on the phase transformation mechanisms in electrodes for lithium-ion batteries (LIBs) is an important but – to date – only less studied subject in battery research. In real-life applications, LIBs usually function at non-ambient conditions and especially …
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The effects of properties, microstructure and phase transformation on the erosion of hard materials
… of the grain boundary or intergranular phase exert a strong influence on both types of erosion. It has in addition been concluded, that a propensity for a stress induced phase transformation, such as that exhibited by stabilised zirconia, will benefit the resistance of a ceramic to …
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Hardness variation and cyclic crystalline-amorphous phase transformation in CuZr alloy during ball milling
… are measured through several cycles of a cyclic phase transformation during ball milling. Each are found to cycle with a period of approximately 320 minutes. Although significant chemical contamination was found in the milled specimens, the results shed some light on mechanical alloying theory …
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Enhanced electrical, optical and chemical properties of graphene oxide through a novel phase transformation
… Based on our understanding, we demonstrate a new phase transformation in GO sheets at mild annealing temperatures (50-80°C), where the oxygen content is preserved and as-synthesized GO structures undergo a phase separation into prominent oxidized and graphitic domains facilitated by oxygen …
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Investigation of the stresses induced during the beta-to-alpha phase transformation in unalloyed plutonium
Includes bibliographical references.
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