Estimation of Grain Boundary Diffusivity in Near-Alpha Titanium Polycrystals (Preprint)

The role of enhanced grain boundary diffusivity in high-temperature diffusion of interstitial elements through metals is widely recognized but poorly characterized in most materials. This paper summarizes an effort to estimate grain boundary diffusivity of oxygen in a near-alpha titanium alloy, Ti-6...

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Bibliographic Details
Main Authors: Pilchak, Adam L, John, Reji, Brockman, Robert A, Porter, III, W J
Format: Report
Language:English
Subjects:
BACKSCATTERING
DIFFUSIVITY
ELECTRON BACKSCATTERING
GRAIN BOUNDARIES
GRAIN BOUNDARY DIFFUSION
MICROMECHANICAL MODELING
OXIDATION
OXYGEN
PE62102F
Properties of Metals and Alloys
TITANIUM ALLOYS
WUAFRLLM121100
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Summary:The role of enhanced grain boundary diffusivity in high-temperature diffusion of interstitial elements through metals is widely recognized but poorly characterized in most materials. This paper summarizes an effort to estimate grain boundary diffusivity of oxygen in a near-alpha titanium alloy, Ti-6Al-2Sn-4Zr-2Mo-0.1Si, by explicitly incorporating microstructure obtained from electron backscatter diffraction into an analytical model. Attention is focused on near-surface diffusion behavior contributing to the rapid ingress of oxygen and possible crack initiation in high-temperature environments. Prepared in collaboration with Univ. of Dayton Research Inst., Dayton, OH. Preprint journal article to be submitted to Scripta Materialia.