Structure of orthorhombic martensitic phase in binary Ti-Nb alloys

被引：0
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作者：
Banumathy, S. [1 ]
Mandal, R.K. [2 ]
Singh, A.K. [1 ]
机构：
[1] Defence Metallurgical Research Laboratory, Kanchanabgh P.O., Hyderabad 500 058, India
[2] Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
来源：
Journal of Applied Physics | 2009年 / 106卷 / 09期
关键词：
The structure of orthorhombic (α″) martensitic phase of Ti-8Nb; Ti-12Nb; and Ti-16Nb alloys has been investigated using Rietveld refinement of x-ray diffraction data. The chemical analysis data have been used to determine the site occupancy of initial models. A limit of the Wyckoff positions has been proposed based on the symmetry of the Cmcm space group; which allows the movement of atoms without breaking the space group symmetry. This has also been incorporated in the initial models of experimental alloys; and accordingly Wyckoff positions have been refined. It has been observed that the atoms move along the Y-axis (parallel to the b-axis) and the movement of atoms increases with increase in Nb concentration. The formation of orthorhombic (α″) phase has been explained based on the movement of atoms along the Y-axis. This in turn breaks the hexagonal symmetry and forms an orthorhombic phase. © 2009 American Institute of Physics;
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