Campus Units

Materials Science and Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2016

Journal or Book Title

Journal of Materials Science

Volume

51

Issue

8

First Page

3684

Last Page

3692

DOI

10.1007/s10853-015-9681-x

Abstract

Adopting a high-throughput combinatorial approach, a compositionally graded Ti–xAl (0 ≤ x ≤ 8 wt%) specimen was prepared to conduct a rapid systematic investigation of the influence of composition and exposure time on the oxidation performance of the titanium-rich section of the binary Ti–Al system. The compositionally graded specimen was solution heat treated and subjected to oxidation tests at 650 °C for different exposure times. The morphology, structure, and composition of the oxide scale as well as the microstructural changes in the base material were studied across the entire composition range, using a suite of characterization techniques. The observations revealed the presence of Al2O3 in the topmost layer of the oxide scale in addition to TiO2, indicating its early formation during oxidation. An increase in Al concentration improves the scaling rate of Ti; however, this is observed only for extended exposure times (i.e., 50 and 100 h), and a parabolic oxidation law is obeyed in the composition-time domain. The formation of the α2 phase (Ti3Al) also takes place for relatively higher Al contents (i.e., 8 wt%).

Comments

This is a manuscript of an article published as Samimi, P., D. A. Brice, R. Banerjee, M. J. Kaufman, and P. C. Collins. "On the influence of alloy composition on the oxidation performance and oxygen-induced phase transformations in Ti–(0–8) wt% Al alloys." Journal of materials science 51, no. 8 (2016): 3684-3692. doi: 10.1007/s10853-015-9681-x. Posted with permission.

Copyright Owner

Springer Verlag

Language

en

File Format

application/pdf

Published Version

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