This study explores how commercially pure titanium (grade 2) behaves under tension-compression cyclic tests at intermediate temperatures. The occurrence of deformation twinning across different temperatures and frequencies was studied using microscopy techniques: polarized light microscopy (PLM) [1], and electron-backscattered diffraction (EBSD). Our findings reveal the unexpected presence of deformation twinning at low frequencies and temperatures up to 275°C. Additionally, we observed slight misorientations within grains and grain growth at higher temperatures. The initiation of twinning predominantly occurs at grain boundaries, with the formation of one twin potentially inducing the activation of another in neighboring grains. To trace the deformation twinning during the cyclic loading of material, the microstructures have been analysed using PLM after each cycle. The study concludes by discussing the influence of twinning on the flow stress and mechanical properties of titanium during cyclic loading, providing insights into its deformation mechanisms at intermediate temperatures.

[1] L. Böhme, L.- Morales-Rivas, S. Diederichs, E. Kerscher: Crystal c-axis mapping of hcp metals by conventional reflected polarized light microscopy: Application to untextured and textured cp-Titanium.Materials Characterization 145 (2018) 573-581. https://doi.org/10.1016/j.matchar.2018.09.024