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. 2001 Dec 1;106(6):997–1012. doi: 10.6028/jres.106.051

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 11 — A sequence of phases formed from the high temperature B2 (ordered BCC) Ti-Al-Nb phase is summarized in the form of maximal group-subgroup relationship. (A) Ti₂AINb alloy, rotational domains of the O phase accommodated in the form of hierarchical twin structure; (B) Ti₂AINb alloy, interfaces between translational domain formed in the Pm3m(B2)-to-Pmma(B19) transition; (C) two-phase mixture of DO₁₉ (matrix) and O-phase (precipitates).