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Metallurgical and Materials Transactions B

, Volume 35, Issue 5, pp 909–917 | Cite as

Diffusion-coefficient measurements in liquid metallic alloys

  • J. -H. Lee
  • Shan Liu
  • H. Miyahara
  • R. Trivedi
Article

Abstract

The value of the diffusion coefficient in the liquid (D l ) is generally obtained from the measurement of composition profiles ahead of a quenched planar interface. The experimental results show significant scatter. The main reason for this scatter will be shown to be due to the presence of fluid flow in the liquid. Directional-solidification studies in the Al-Cu system have been carried out to first establish the experimental conditions required for diffusive growth. The composition profiles are then measured to obtain the values of D l for alloy compositions ranging from 4.0 to 24.0 wt pct Cu. The value of D l =2.4×10−3 mm2/s was obtained along the liquidus line, and this result is significantly smaller than the values reported in the literature, which vary from 3.0 to 5.5 × 10−3 mm2/s. It is shown that the scatter in the reported values can be correlated with the diameter of the sample used and, thus, with the fluid flow present in their experiments. Detailed experimental procedures to obtain and verify diffusive-growth conditions are outlined, and appropriate analyses of the data are discussed.

Keywords

Diffusion Coefficient Material Transaction Effective Diffusion Coefficient Composition Profile Interface Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2004

Authors and Affiliations

  • J. -H. Lee
    • 1
  • Shan Liu
    • 2
  • H. Miyahara
    • 3
  • R. Trivedi
    • 2
    • 4
  1. 1.the Department of Metallurgy and Materials ScienceChangwon UniversityChangwonSouth Korea
  2. 2.United States Department of EnergyAmes LaboratoryAmes
  3. 3.the Materials Science and Engineering DepartmentKyushu UniversityFukuokaJapan
  4. 4.Materials Science and EngineeringIowa State UniversityAmes

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