Ravi Raj Purohit Purushottam Raj Purohit¹, Alla Ndiaye Dieng¹, Celine Gerard², Loic Signor³, Abhinav Arya⁴, Girish Bojjawar⁴, Satyam Suwas⁴, Atul H. Chokshi⁴, Ludovic Thilly¹; ¹Pprime Institute - Poitiers University, ²Pprime Institute - CNRS, ³Pprime Institute - ENSMA, ⁴Indian Institute of Science

Severely cold drawn Ni micro-wires mechanical behavior has been intensively studied showing the architecture key-role in the observed significant size effects [Purushottam et al, Sc Rep, 2019], where their tensile strength approaches the theoretical strength with a reduction of diameter from 120 µm down to 20 µm [Warthi et al, Script Mat, 2013]. In-situ deformation study under synchrotron radiation allowed to achieve a fundamental understanding of the observed size effect by monitoring the evolution of microstructure (including dislocation storage) and detecting elastic-plastic transition in the different grain families. Realistic 3D microstructures were generated using EBSD maps and texture information. Crystal plasticity FE simulations were performed, both with semi-phenomenological and physical-based models fed by dislocations densities experimentally obtained during TEM observations. The influence of different microstructural parameters was investigated. The feasibility of driving the micro-wires strength and ductility by the architecture design is discussed.