Time-resolved X-ray Diffraction and Electrical Resistance Measurements of Structural Phase Transitions in Zirconium PDF Download
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Languages : en
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Here, we have designed a portable pressure controller module to tune compression rates and maximum pressures attainable in a standard gas-membrane diamond anvil cell (DAC). During preliminary experiments, performed on zirconium (Zr) metal sample, pressure jumps of up to 80 GPa were systematically obtained in less than 0.2s (resulting in compression rate of few GPa/s up to more than 400 GPa/s). In-situ x-ray diffraction and electrical resistance measurements were performed simultaneously during this rapid pressure increase to provide the first time resolved data on [alpha] → [omega] → [beta] structural evolution in Zr at high pressures. Direct control of compression rates and peak pressures, which can be held for prolonged time, allows for investigation of structural evolution and kinetics of structural phase transitions of materials under previously unexplored compression rate-pressure conditions that bridge traditional static and shock/dynamic experimental platforms.
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Languages : en
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Book Description
Here, we have designed a portable pressure controller module to tune compression rates and maximum pressures attainable in a standard gas-membrane diamond anvil cell (DAC). During preliminary experiments, performed on zirconium (Zr) metal sample, pressure jumps of up to 80 GPa were systematically obtained in less than 0.2s (resulting in compression rate of few GPa/s up to more than 400 GPa/s). In-situ x-ray diffraction and electrical resistance measurements were performed simultaneously during this rapid pressure increase to provide the first time resolved data on [alpha] → [omega] → [beta] structural evolution in Zr at high pressures. Direct control of compression rates and peak pressures, which can be held for prolonged time, allows for investigation of structural evolution and kinetics of structural phase transitions of materials under previously unexplored compression rate-pressure conditions that bridge traditional static and shock/dynamic experimental platforms.
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Languages : en
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![Pressure-induced Kinetics of the [alpha] to [omega] Transition in Zirconium PDF](https://books.google.com/books/content/images/frontcover/UFWfswEACAAJ?fife=w80-h100)
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Languages : en
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Diamond anvil cells (DAC) coupled with x-ray diffraction (XRD) measurements are one of the primary techniques for investigating structural stability of materials at high pressure-temperature (P-T) conditions. DAC-XRD has been predominantly used to resolve structural information at set P-T conditions and, consequently, provides P-T phase diagram information on a broad range of materials. With advances in large scale synchrotron x-ray facilities and corresponding x-ray diagnostic capabilities, it is now becoming possible to perform sub-second time resolved measurements on micron sized DAC samples. As a result, there is an opportunity to gain valuable information about the kinetics of structural phase transformations and extend our understanding of material behavior at high P-T conditions. Using DAC-XRD time resolved measurements, we have investigated the kinetics of the [alpha] to [omega] transformation in zirconium. We observe a clear time and pressure dependence in the martensitic [alpha]-[omega] transition as a function of pressure-jump, i.e., drive pressure. The resulting data are fit using available kinetics models, which can provide further insight into transformation mechanism that influence transformation kinetics. Lastly, our results help shed light on the discrepancies observed in previous measurements of the [alpha]-[omega] transition pressure in zirconium.
Author: Deborah D. L. Chung
Publisher: Wiley-VCH
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Category : X-rays
Languages : en
Pages : 288
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A textbook for a graduate or undergraduate course in programs such as x-ray diffraction, materials characterization, and thermal analysis. Introduces the principles and instrumentation of x-ray diffraction at elevated temperatures, and its application to crystallography, materials science, chemical and electrical engineering, and other fields. Focusing on intense sources and position-sensitive detectors, describes in-situ phase identification, texture analysis, and grain-size measurement. Annotation copyright by Book News, Inc., Portland, OR
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Category : Nuclear energy
Languages : en
Pages : 912
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Languages : en
Pages : 24
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Category : Nuclear reactors
Languages : en
Pages : 370
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Category : Power resources
Languages : en
Pages : 1472
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Category : Aeronautics
Languages : en
Pages : 308
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Category : Physics
Languages : en
Pages : 1256
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