Metallurgical and Materials Transactions A

, Volume 32, Issue 12, pp 2969-2974

First online:

Liquid titanium solute diffusion measured by pulsed ion-beam melting

  • P. G. SandersAffiliated withFord Research Laboratory, Ford Motor Company
  • , M. O. ThompsonAffiliated withthe Materials Science and Engineering Department, Cornell University
  • , T. J. RenkAffiliated withthe Beam Applications and Initiatives, Sandia National Laboratories
  • , M. J. AzizAffiliated withthe Division of Engineering and Applied Sciences, Harvard University

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The diffusivities of Sn, Mo, Zr, and Hf in liquid Ti were determined by pulsed ion-beam melting of thin liquid layers. Time-resolved optical reflectance and one-dimensional heat-flow simulations were employed to determine the melt duration. The broadening of nearly Gaussian solute concentration-depth profiles was determined ex situ using Rutherford backscattering spectrometry. Solute diffusivities in the range of 5 to 9×10−5 cm2/s were determined at temperatures in the range of 2200 to 2500 K. Calculations of buoyancy and Marangoni convection indicate that convective contamination is unlikely.