Effects of aluminum and oxygen additions on quenched-in compositional fluctuations, dynamic atomic shuffling, and their resultant diffusionless isothermal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si35.svg" display="inline" id="d1e1389"> <mml:mi>ω</mml:mi> </mml:math> transformation in ternary Ti–V-based alloys with bcc structure