Abstract
We have investigated twinning-microstructure relations in β-Ti alloys by statistical analysis of the evolving twin structure upon deformation by in-situ SEM testing and electron backscattering diffraction (EBSD). In particular, we have analyzed the effects of crystallographic orientation, grain size and chemical gradient structure on the nucleation and propagation behavior of {332}<113> twins in a β-Ti-15 Mo (wt.%) alloy and a multilayered β-Ti-10Mo-xFe (x: 1-3 wt.%). Microstructural parameters such as number of twins per grain and number of twins per grain boundary area were statistically analyzed.
Highlights
Deformation twinning is considered as a key deformation mode to design structural β(bcc) Ti-alloys with enhanced mechanical properties
The present work reports quantitative analysis of microstructure-twinning relations in β-Ti alloys. These relations were investigated by statistical analysis of the evolving twin structure upon deformation at room temperature by in-situ SEM testing and electron backscattering diffraction (EBSD)
EBSD reveals that the twin structure consists of primary twins, i.e. twin variants with the highest Schmid factor v(1), and secondary twins (twin variants with Schmid factors v(2) to v(12))
Summary
Deformation twinning is considered as a key deformation mode to design structural β(bcc) Ti-alloys with enhanced mechanical properties. The formation of a twinning substructure upon straining tends to enhance the strain hardening behavior of polycrystalline materials and novel alloy design strategies are currently developing to optimize the twinning substructure in bcc-Ti alloys [1,2,3,4,5,6] In these alloys two twinning systems have been reported, namely, {112} and {332} [1,2,3, 6,7,8,9,10,11,12]. Grain boundary misorientation has been reported to play significant role on twin nucleation and propagation in hcp metals [23, 24, 26]. These results underline the importance of microstructure on twinning behavior in bcc-Ti alloys. These relations were investigated by statistical analysis of the evolving twin structure upon deformation at room temperature by in-situ SEM testing and electron backscattering diffraction (EBSD)
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