Inhomogeneous Deformation Twinning Measurement Using Digital Image Correlation and Acoustic Emission

This study is conducted to measure the inhomogeneous twin region nucleation and macroscopic strain field in a polycrystalline Ti under uniaxial tensile loading. First, we prepare commercial polycrystalline Ti plate. Secondly, using Digital Image Correlation (DIC) and Acoustic Emission (AE) techniques, we simultaneously measure the macroscopic stress–strain curve, macroscopic local strain field, and twin region nucleation behavior arising in polycrystalline Ti under tensile loading. The inhomogeneous twin region nucleation is derived from its initial microstructure state. In the inhomogeneous twin region nucleation process, the twin region nucleation points become closer to each other under proceeding deformation. Then, the rapid growth of twin region size occurs and the size reaches their critical one, thereby producing avalanche nucleation behavior. Additionally, the macroscopic inhomogeneous strain field is formed as a result of inhomogeneous large twin region nucleation behaviors.

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