Accession Number:

ADA564292

Title:

Phase Transformations in the Oxygen-Enriched Case Layer of Beta Titanium Alloys Formed During Oxidation (Preprint)

Descriptive Note:

Technical paper 1 Jul-1 Aug 2012

Corporate Author:

UNIVERSITY OF NORTH TEXAS DENTON

Personal Author(s):

• Tiley, J.
• Behera, A.
• Mahdak, K.
• Mohseni, H.
• Nag, S.
• Banerjee, R.

Report Date:

2012-08-01

Pagination or Media Count:

16.0

Abstract:

The formation of an oxide layer along together with alpha precipitation in the subsurface oxygenenriched zone, during the oxidation of a Beta-Ti alloy, has been investigated using SEM, STEM, and nanoindentation. Just below the nanocrystalline oxide layer, a two-phase mixture consisting of nanoscale equiaxed alpha grains and rutile grains is formed. Further below, the morphology of the alpha precipitates transitions to more lath-like with their size-scale, nucleation density, and the volume fraction of Beta progressively changing with increasing depth.

Descriptors:

• *OXIDATION
• *PHASE TRANSFORMATIONS
• *TITANIUM ALLOYS
• HARDNESS
• MORPHOLOGY
• NUCLEATION
• OXIDES
• OXYGEN
• PRECIPITATION
• SUBSURFACE
• TWO PHASE FLOW

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE