Twin induced Strain Hardening, Grain Fragmentation, and Texture Evolution during Cold Compression of CP-Ti

Abstract

This work is a systematic investigation of the twin induced strain hardening behavior, grain fragmentation, and texture evolution during titanium’s cold compression. The compression tests were stopped at intermediate strains for quantitative microscopy by electron backscattered diffraction. The microstructural examination indicates the evolution of {1012} extension twins (ET), {1122} contraction twins (CT) and the interaction between them. The strain hardening rate and its derivative plot could be corroborated with the microstructural features and distinguishes regions of slip and twin dominating zones. The texture evolution indicates that dislocation slips were active apart from deformation twins during deformation. Texturally hard ET evolves, broadens, and interacts in texturally soft grains at low and intermediate strains. The ET regions are suitable for the nucleation of texturally soft CT with further strain. During deformation, ET-ET ∼56.8〈1010〉, CT-CT ∼77〈1010〉, ET-CT ∼87〈4221〉 interactions boundaries and CT-ET ∼44.5〈5140〉 double twins develop.