세미나안내

[2016 12 14] 정기세미나 12th

Atomic-Scale Quantification of Local Chemical Composition in 3D and Its Correlative Crystallographic Investigation

관리자 | 2016.12.12 13:04 | 조회 29498


 Date: 2016. 12. 14(WED) , 17:00 ~ 18:15

 Place: Science Building, Room.202 Multimedia Room

 Title: Atomic-Scale Quantification of Local Chemical Composition in 3D and

Its Correlative Crystallographic Investigation

 Speaker: Ph. D. Seol, Jae-Bok (NINT)

Host of a Seminar: Prof. Park, Chan-Gyung

 

Speaker Language: ENGLISH

 

Abstract:

 

Multiple-scale microstructural characterization strengthens and sharpens the competitive edge

of materials science and materials engineering. The actual measurement of unsolved, unproved, or

veiled phenomena in materials often provides a new pathway for extending joint researches of

materials design and of modelling.

Despite its tremendous importance, one of the major obstacles in bridging this characterization

into application is the huge challenge associated with quantitative characterization in 3D and its

approach that combines the accuracy of structural characterization. To solve this fundamental problem,

complementary analytical tools of electron backscatter diffraction (EBSD), transmission electron

microscopy (TEM), and atom probe tomography (APT) must be employed from the micrometer scale

down to the atomic scale. Amongst these techniques, APT offers an access to deeper understanding

microstructure-property relations that involve atomic transport mechanisms and related internal

structural defects in materials. Hence, correlative structural and chemical analysis provides 3D

compositional and crystallographic information with equal detection sensitivity (a few ppm) to all

elements at near-atomic resolution.

Here, this presentation is divided into three sections, the first of which summarizes briefly the

principle of atom probe as well as the importance of complementary characterization methods. The

second section minimally introduces three examples of the correlative analysis: (i) nano-architectured

engineering metallic alloys, outlining how formation of highly regular nano-arrays of nanoparticles

achieves the maximum strength of a body-centered cubic Fe-based alloy, doped with Ti, Mo, and V;

(ii) plastic instability at the atomic scale, underlining how controlling two parameters (carbon, strain

rate) can be used to manipulate the plastic instability, short-range ordering, and work-hardening rate

of a high-Mn martensitic-austenitic steel, especially from the micrometer scale down to the atomic

scale; (iii) in situ observation and quantification of conductive filament growth in a Ag/TiO2/Pt-based

resistive switching device at the atomic scale. The third section simply presents various experimental

challenges that need to be overcome, such as hydrogen detection, and technical artifacts in nonconductive

materials.

 

Department of Materials Science and Engineering






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