Stabilizing the body centered cubic crystal in titanium alloys by a nano-scale concentration modulation

Journal Article · Sat Apr 01 00:00:00 EDT 2017 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2016.12.406· OSTI ID:1343142

Wang, H. L.; Shah, S. A. A.; Hao, Y. L.; Prima, F.; Li, T.; Cairney, J. M.; Wang, Y. D.; Wang, Y.; Obbard, E. G.; Li, S. J.; Yang, R.

It is well-known that the body centered cubic (bcc) crystal in titanium alloys reaches its stability limit as the electron-to-atom (e/a) ratio of the alloy drops down to ~4.24. This critical value, however, is much higher than that of a multifunctional bcc type alloy (e/a = 4.15). Here we demonstrate that a nano-scale concentration modulation created by spinodal decomposition is what stabilizes the bcc crystal of the alloy. Aided by such a nano-scale concentration heterogeneity, unexpected properties from its chemically homogeneous counterpart are obtained. This provides a new strategy to design functional titanium alloys by tuning the spinodal decomposition.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: USDOE; FOREIGN
• OSTI ID: 1343142
• Journal Information: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 700; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: United States
• Language: ENGLISH

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36 MATERIALS SCIENCE