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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:700

Article

Wang, H. L.¹  Shah, S. A. A.¹  Hao, Y. L.¹  Prima, F.²  Li, T.^3,4  Cairney, J. M.^3,4  Wang, Y. D.⁵  Wang, Y.^6,7,8  Obbard, E. G.⁹  Li, S. J.¹  Yang, R.¹ 

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China

[2] PSL Res Univ, Chim ParisTech CNS, Inst Rech Chim Paris, F-75005 Paris, France

[3] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia

[4] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[5] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[6] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[7] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710049, Peoples R China

[8] Ohio State Univ, Dept Mat Sci & Engn, 116 W 19Th Ave, Columbus, OH 43210 USA

[9] Univ New South Wales, Dept Elect Engn & Telecommun, Sydney, NSW 2052, Australia

关键词: Titanium alloys;    Composition fluctuation;    Crystal structure;    Synchrotron radiation;    Shape memory;    Elasticity;   

DOI  :  10.1016/j.jallcom.2016.12.406

来源: Elsevier

【 摘 要 】

It is well-known that the body centered cubic (bcc) crystal in titanium alloys reaches its stability limit as the electron-to-atom (ela) ratio of the alloy drops down to similar 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. (C) 2017 Elsevier B.V. All rights reserved.

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