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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Phase Fraction Estimation in Multicomponent Alloy from EDS Measurement Data.

Andriy Burbelko1, Tomasz Wiktor1, Aldona Garbacz-Klempka1

  • 1Faculty of Foundry Engineering, AGH University of Krakow, 23 Reymonta Str., 30-059 Krakow, Poland.

Materials (Basel, Switzerland)
|May 25, 2024
PubMed
Summary

This study introduces a novel method for assessing material quality by using local chemical composition maps to quantify phase fractions. This approach enhances accuracy in evaluating metal alloys and engineering materials, overcoming limitations of traditional methods.

Keywords:
QuantMapX-ray microanalysisevaluation of phase fraction

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Area of Science:

  • Materials Science
  • Metallurgy
  • Analytical Chemistry

Background:

  • Quality assessment of engineering materials relies on accurate measurement of phase volume fractions.
  • Traditional methods using optical microscopy face challenges due to etching inhomogeneity and phase boundary pixels.
  • Segregation of alloy components further complicates accurate phase identification.

Purpose of the Study:

  • To develop a quantitative method for phase composition evaluation using local chemical composition data.
  • To address uncertainties in phase identification caused by etching and mixed-phase pixels.
  • To apply this novel approach to an EN AC 46000 alloy sample.

Main Methods:

  • Utilized quantitative elemental concentration maps from a scanning electron microscope (Tescan Mira GMU) in QuantMap mode.
  • Employed local chemical composition measurements as the primary signal for phase fraction analysis.
  • Calculated phase fractions by minimizing an objective function based on elemental concentration deviations.

Main Results:

  • Successfully generated quantitative maps of elemental concentration distributions.
  • Developed a method to evaluate phase fractions even when X-ray microanalysis signals include multiple phases.
  • Demonstrated the application of the method for phase composition evaluation of EN AC 46000 alloy.

Conclusions:

  • Local chemical composition mapping offers a robust alternative for quantitative phase analysis.
  • The developed method improves accuracy in material quality assessment by overcoming traditional limitations.
  • This technique provides a more reliable way to determine phase fractions in complex alloys.