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 8 of 8 for “"in situ neutron diffraction"”.
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Effect of Chemistry on the Transformation of Austenite to Martensite for Intercritically Austempered Ductile Iron
Intercritically austempered ductile iron (IADI) with a matrix microstructure of ferrite plus metastable austenite has an excellent combination of strength and toughness. The high strength and good ductility of this material is due to the transformation of metastable austenite to martensite during …
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Granular Shape Memory Ceramics
Shape memory ceramics (SMCs) are burgeoning functional materials based on zirconia with a reversible, stress-inducible martensitic phase transformation. Compared to metallic shape memory alloys, SMCs have broader operating temperatures, higher critical stresses, and larger mechanical hysteresis …
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Characterization of Stresses and Strains Involved in the Martensitic Phase Transformations
Transformation-induced plasticity (TRIP) steels are an example of steels used in the automotive industry, where strain-induced martensitic transformations, associated plasticity and work hardening, enhance both the strength and ductility of the material. This has enhanced both the passenger safety …
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Characterisation and Development of Nanostructured, Ultrahigh Strength, and Ductile Bainitic Steels
… further develop a novel nanostructured type of bainitic steel. Three chemical compositions were considered with different concentrations of Al and Co. The addition of Al and Co is believed to be necessary to produce the desired nanostructure at very low temperatures within a reasonable …
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Underlying deformation behavior of medium/high entropy alloys using advanced electron imaging and diffraction
Medium and high entropy alloys (M/HEAs), formed in a large region of compositional space that are little explored, have demonstrated unusual combinations of strength, ductility, and damage tolerance. Their complex chemistries create rich defect energy landscapes and multiple pathways for mechanical …
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Origin of Creep-Fatigue Back Stress and its Effect on Deformation and Damage
Creep deformation of metals operating at a high temperature in electricity generation plant can limit the lifetime of components and pressurized systems. Assessment of a structure’s creep life under power plant operation conditions is a complex problem due to materials being exposed to cyclic load …
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Factors contributing to the yield strength of polycrystalline nickel-based superalloys
… superalloys are the material of choice for use in the hottest regions of gas turbine engines due to their inimitable mechanical properties, in particular, high temperature strength. As we become increasingly aware of the environmental consequences of air travel, manufacturers are striving to …
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Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials
Piezoelectric materials find applications in multitude of devices such as sensors, actuators and energy harvesters. However, most of these piezoelectric materials utilize lead-based systems which are becoming serious problem owing to the restrictions imposed by regulatory agencies across the globe. …