Pengyu Wang, Ziqi Wei, Pingli Mao, Le Zhou, Zhi Wang, Feng Wang, Xuanyu Liu, Zheng Liu
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Nucleation and Growth Analysis of {10–12} Tensile Twin in TA2 Alloy by In-Situ Tensile Test
The nucleation and growth of {10–12} tensile twins in TA2 pure titanium during in-situ tensile test are explored by electron backscattered diffraction (EBSD). The dynamic process of twin growth can be clearly revealed by observe the evolution of microstructure at the same position with cumulative strains increases. According to the statistics and analysis of experimental data, it is found that the Schmid factor (SF) plays an important role during the nucleation and growth of twins. The twin variants with high SF are easy to be activated. However, approximately 18% of twins not satisfy the SF law, have low SF, nucleation and growth occur during deformation. In addition, the strain compatibility between tensile twins and various deformation modes in adjacent grains are analyzed by geometric compatibility factor. For tensile twin nucleation and growth, the shear strain generated by various deformation modes in adjacent grains plays an important role. The shear strain generated by tensile twins and pyramidal slip are beneficial to the twin nucleation, however, pyramidal slip is not conducive to the twin growth.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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