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EVENT: CMCA Seminar Series: Determination of the ordering scheme in B2 phases in high entropy alloys using ChemiSTEM equipped aberration-corrected electron microscopy

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Today's date is Tuesday, November 24, 2020
CMCA Seminar Series: Determination of the ordering scheme in B2 phases in high entropy alloys using ChemiSTEM equipped aberration-corrected electron microscopy Other events...
Considerable effort has been focused on the development of high entropy alloys (HEA) or alternatively, compositionally complex alloys (CCA). These alloys are usually made up of four or more elements, all with similar, or at least significant, elemental compositions. Some of these CCAs exhibit microstructures that are single phase, but most have two or more constituent phases. In the case of these latter alloys, often the microstructure consists of a disordered bcc phase and an ordered B2 compound (i.e., the ordered bcc CsCl crystal structure). The first part of the talk describes the application of STEM/XEDS tomography to 3D characterization of the microstructure. To develop an understanding of the behavior of these alloys, it is necessary to understand the ordering scheme of the B2 phase, e.g., how are the alloying elements distributed over the two sub-lattices, and to what degree is the phase ordered (i.e., what is the value of its long-range ordering parameter). The second part of the talk describes the application of x-ray energy dispersive spectroscopy in an aberration-corrected scanning transmission electron microscope to determine the actual compositions of the individual sub-lattices. This task requires measurements of elemental compositions on the atomic scale, i.e., atomically resolved XEDS.
Speaker(s) Professor Hamish Fraser from Ohio State University
Location CMCA Seminar Room 1.80 Physics Building
Contact CMCA Admin <[email protected]> : 6488 2770
Start Wed, 10 Dec 2014 16:00
End Wed, 10 Dec 2014 17:00
Submitted by CMCA Admin <[email protected]>
Last Updated Wed, 06 May 2015 13:41
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