Liquid titanium solute diffusion measured by pulsed ion-beam melting

P G Sanders,T J Renk,M O Thompson,M J Aziz

doi:10.1007/s11661-001-0171-1

P G Sanders, T J Renk + Show 2 more

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https://doi.org/10.1007/s11661-001-0171-1

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Abstract

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 x 10 -5 cm 2 /s were determined at temperatures in the range of 2200 to 2500 K. Calculations

Highlights

Ti alloys are important commercial materials in the aerospace industry because of their high strength to weight ratio
The elevated melting point (Tm) and high reactivity of Ti exacerbate both of Liquid Ti Solute Diffusion Measured by pulsed Ion-Beam Melting
Melt duration is a critical parameter in the diffusion simulations, because any error in the calculated melt duration yields a proportional error in the diffusivity

Summary

Introduction

Ti alloys are important commercial materials in the aerospace industry because of their high strength to weight ratio. In understanding the process of alloy solidification and solute partitioning, the liquid diffusivity is a critical parameter. In addition to the absence of experimental measurements of Ti solute liquid diffusivities in the literature[1,2], there is a general deficit in knowledge of the thermophysical properties of the liquid phase, including latent heat, specific heat, and thermal conductivity. This paper reports on direct experimental determination of liquid diffusivities of some common alloying elements in Ti. Liquid diffusivity is a challenging property to measure accurately. Two potentially serious problems associated with liquid diffusivity measurements are convective contamination and container wall interactions[1]. The elevated melting point (Tm) and high reactivity of Ti exacerbate both of Liquid Ti Solute Diffusion Measured by pulsed Ion-Beam Melting

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Conclusion