β-Ti Alloys with Low Young’s Moduli Interpreted by Cluster-Plus-Glue-Atom Model

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 44; no. 4; pp. 1872 - 1879
• Main Authors: Wang, Qing, Ji, Chunjun, Wang, Yingmin, Qiang, Jianbing, Dong, Chuang
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.04.2013; Springer
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Exact sciences and technology; Materials Science; Metallic Materials; Metals. Metallurgy; Nanotechnology; Structural Materials; Surfaces and Interfaces; Thin Films; Cluster Center; High Structural Stability; Neighbor Configuration; Bulk Metallic Glass; Solid Solution Alloy; Elastic modulus; Cluster; Modeling
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-012-1523-8

β -Ti bio-alloys with low Young’s moduli ( E ) require multiple alloying using both BCC stabilizers and low- E elements. In this study, the cluster-plus-glue-atom model was introduced in the composition interpretation and design of Ti-based (Ti,Zr)-(Mo,Sn)-Nb alloys. Alloying elements are grouped according to their enthalpies of mixing with Ti, forming a general cluster formula [(Mo,Sn)(Ti,Zr) 14 ]Nb 1 or 3 , where the square brackets enclose the nearest neighbor coordination polyhedron cluster CN14 of the BCC structure and Nb is the glue atom. The formulated compositions could reach simultaneously low E and high β -Ti structural stabilities, as exemplified by [(Mo 0.5 Sn 0.5 )(Ti 13 Zr)]Nb 1 which had a Young’s modulus as low as 48 GPa in the suction-cast state.