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The role of oxygen atoms in the α″ martensite phase was investigated in the Ti-20at.% Nb alloy by X-ray diffractometry and differential scanning calorimetry. The axial ratio b/a of α″ martensite and reverse martensitic transformation temperature increased with increasing oxygen content. These results imply that the α″ martensite was stabilized by oxygen atoms, owing to the relaxation of the strain...
The microstructure and martensitic transformation behavior of (Ti–23Nb)–1.0O (at.%) alloy have been closely and systematically investigated by transmission electron microscopy (TEM). Diffuse streaks along the 〈110〉β∗ directions with intensity maxima at 1/2 positions between basal spots are observed in selected area diffraction patterns obtained from the β phase. The streaks correspond to six variants...
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