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Showing 1 to 20 of 385 for “"precipitates"”.
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Studies on the Formation of Analytical Precipitates
Made available in DSpace on 2015-05-12T17:02:25Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0005995.PDF: 2656125 bytes, checksum: d5fa7b5bf4250449be722acf955657dc (MD5) Previous issue date: 1953
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Phase field model for precipitates in crystals
… on the microelectronic device production. Oxygen precipitates are useful for gathering metallic contaminants away from the device regions and for increasing the mechanical strength of the wafer [Borghesi, 1995], but they also can destroy the electrical and mechanical characteristics of the …
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Effects of diffraction on microanalysis of embedded precipitates
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1991.
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Microstructural study of intergranular M23C6 precipitates in Alloy 709
… X-ray diffraction (XRD). Intergranular M23C6 precipitates were first formed on high angle grain boundaries, followed by the formation of lamella-shaped M23C6 precipitates on twin boundaries. The precipitation time threshold of M23C6 was different from the known behaviors of other Fe-20Cr-25Ni …
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The reversion kinetics of pre-precipitates in an aluminum - copper alloy.
Massachusetts Institute of Technology. Dept. of Metallurgy and Materials Science. Thesis. 1972. Ph.D.
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The role of precipitates on fiber/matrix interfaces in metal matrix composites
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Temperature effects on the electronic properties of lead telluride (PbTe) and the influence of nano-size precipitates on the performance of thermoelectric materials. (SrTe precipitates in PbTe bulk material)
… heterojunction. The crystal shape of the SrTe precipitates in the PbTe host matrix was evaluated from the interface energies using the Wulffman construction. We also attempted to develop a relation between the interface energies and electronic band alignment for different interface …
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Quantification of bond strength between cementitious materials and microbially-induced calcium carbonate precipitates
Researchers have recently demonstrated the capabilities of microbially-induced calcium carbonate precipitation to fill and seal cracks in cementitious materials. However, the mechanical strength of microbially-induced crack healing is seldom investigated, especially at the fundamental level. In an …
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Characteristic Analysis of Acid Mine Drainage Precipitates for the Optimization of Rare Earth Extraction Processes
… Tech have shown that AMD and the treatment precipitates (AMDp) are enriched in rare earth elements (REEs). Given the importance of REEs to modern technology, as well as potential supply restrictions, subsequent research has attempted to identify promising methods to extract and recovery REEs …
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Development of Leaching Processes for the Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates
… oxide preconcentrate (REOP) from AMD treatment precipitates and a final stage mixed rare earth oxide (MREO) product. This body of research examines a selective leaching process for each of these products and determines the activation energy associated with the leaching processes. Acid leaching …
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Role of segregation and precipitates on interfacial strengthening mechanisms in metal matrix composites when subjected to thermo-mechanical processing
<p>Metal Matrix ceramic-reinforced composites are rapidly becoming strong candidates as structural materials for many high temperatures and aerospace applications. Metal matrix composites combine the ductile properties of the matrix with a brittle phase of the reinforcement, leading to high …
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Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography.
… evolution and nucleation study on the precipitates in the low-Si 319 type aluminum alloys are also presented with sample preparation and analysis condition of TEM and 3DAP tomography.
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ΕΠΙΔΡΑΣΗ ΤΗΣ ΠΑΡΟΥΣΙΑΣ ΤΟΥ ΧΑΛΚΟΥ ΣΤΟΝ ΠΕΡΛΙΤΙΚΟ ΚΑΙ ΜΠΑΙΝΙΤΙΚΟ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟ ΤΩΝ ΧΑΛΥΒΩΝ
… PEARLITIC TRANSFORMATION IT WAS FOUND THAT PRECIPITATES BELONGING TO THE PHASE E-CU EXISTED WITHIN THE PROEUTECTOID PHASES EITHER THE PROEUTECTOID CEMENTITE OR THE PROEUTECTOID FERRITE. WITHING PEARLITESTHE PRESENCE OF SMALL E-CU PRECIPITATES WAS FOUND WITHIN BOTH PEARLITIC FERRITE AND …
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The Effect of Stress State and Precipitation on Stress-Induced Martensitic Transformations in Polycrystalline and Single Crystal Shape Memory Alloys: Experiments and Micro-Mechanical Modeling
… perfectly coherent Ti$\sb{11}$Ni$\sb{14}$ precipitates in NiTi. Using the model, the decrease in the orientation dependence of $\sigma\sb{\rm cr}$ is linked to the unique orientation relationship that exists between the coherent precipitates in NiTi and the martensite correspondence variant …
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Oxygen precipitate studies in silicon for gettering in solar cell applications
Oxygen precipitates in silicon can be used (in a process called internal gettering) as sites of heterogeneous nucleation of precipitates of iron and other transition metal that are harmful to solar cell device operation. Oxygen precipitate densities in p- (10¹⁴ boron atoms/cm³) wafers were …
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Multiphase particle-size-grouping model of precipitation and its application to thermal processing of microalloyed steel
The formation and presence of second phase precipitates greatly influence the properties of metal alloys, and varies with alloy composition and temperature history. In microalloyed steel, for example, precipitates may lead to beneficial grain refinement or detrimental transverse surface cracks. A …
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Triple oxygen isotope measurements in chert: insights into the Snowball Earth glaciations
… during this time. This study analyzes silica precipitates within a carbonate sequence immediately underlying a Cryogenian diamictite to better understand this relationship, particularly the chemistry of subglacial meltwater. Using triple oxygen isotope measurements, clumped isotope …
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