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The microstructure evolution of the twin of TB6 (Ti-10V-2Fe-3Al) under planar wave detonation was studied. The initial microstructure of the alloy consists of an α and β phase. It is found that twin deformation is operated in only the α phase due to the limited slip system in this phase. α grains are mainly rotated from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>{</mo><mn>10</mn></mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo stretchy="false">¯</mo></mover><mrow><mn>0</mn><mo>}</mo></mrow></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>{</mo><mn>0002</mn><mo>}</mo></mrow></mrow></semantics></math></inline-formula> during the deformation due to the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>{</mo><mn>10</mn></mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo stretchy="false">¯</mo></mover><mrow><mn>2</mn><mo>}</mo><mo><</mo><mn>10</mn></mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo stretchy="false">¯</mo></mover><mover accent="true"><mrow><mn>1</mn></mrow><mo stretchy="false">¯</mo></mover><mo>></mo></mrow></semantics></math></inline-formula> twin. Twin variant selection is found in this study, and the orientation of all <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>{</mo><mn>10</mn></mrow><mover accent="true"><mrow><mn>1</mn></mrow><mo stretchy="false">¯</mo></mover><mrow><mn>2</mn><mo>}</mo></mrow></mrow></semantics></math></inline-formula> twins is oriented at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>{</mo><mn>0002</mn><mo>}</mo></mrow></mrow></semantics></math></inline-formula> in different α grains with different deformation degrees. The twin variant selection is well explained based on the strain relaxation along the loading axis and the Schmid factor for twinning shear.