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A multi-slice sliding cell technique for diffusion measurements in liquid metals.

Langxiang Zhong1, Jinliang Hu1, Yongliang Geng1

  • 1School of Materials Science and Engineering and Anhui Provincial Key Lab of Advanced Functional Materials and Devices, Institute of Amorphous Matter Science, Hefei University of Technology, Hefei 230009, People's Republic of China.

The Review of Scientific Instruments
|October 2, 2017
PubMed
Summary

A new multi-slice sliding cell technique offers accurate inter-diffusion measurements in liquid metals. Sufficient annealing time is crucial to overcome initial convective flow effects for reliable diffusion constant determination.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Metallurgy

Background:

  • Traditional methods for diffusion measurements in liquid metals include long capillary and shear-cell techniques.
  • These methods have limitations in terms of handling and in situ monitoring.

Purpose of the Study:

  • To develop a novel, compact, and easily handled device for inter-diffusion measurements in liquid metals.
  • To assess the accuracy and applicability of the new technique for diffusion studies.

Main Methods:

  • A multi-slice sliding cell device was designed, utilizing linear sliding movement.
  • Inter-diffusion experiments were conducted on Al-Cu melts using the developed technique.
  • Time-dependent diffusion experiments were performed to evaluate the influence of annealing time.

Main Results:

  • Accurate diffusion constants in liquid metals require sufficient annealing time.
  • Short annealing times lead to convective flow, artificially increasing the measured diffusion coefficient by a factor of three.
  • Diffusion data for Al-Cu melts align with highly accurate in situ X-ray radiography measurements.

Conclusions:

  • The multi-slice sliding cell technique provides accurate inter-diffusion measurements in liquid metals.
  • The device is compact, easy to handle, and adaptable for in situ monitoring with X-rays or neutrons.
  • This technique is suitable for advanced diffusion studies in liquid metal systems.