Combined Experimental and Computational Study to Examine Lateral Constraint Effects on Single-Slip Oriented Microcompression Experiments (Preprint)

摘要

A custom in-situ SEM mechanical testing system has been used to study the compressive deformation behavior of single-slip oriented Rene N5 microcrystals. Two different compression platens were used to explore the effect of lateral stiffness on the resultant mechanical response, which approximated either a full-frictional or zero-friction case. The change in the lateral constraint of the test system had a demonstrable effect on many aspects or attributes of plastic flow: the measured modulus, yield stress and strain hardening behavior, the intermittency of strain bursts, the spatial distribution of slip bands, and the development of internal lattice rotations. Finite element modeling of the microcompression experiments using a crystal plasticity framework enabled insight regarding changes in the internal stress field and resultant slip system activity. The experimental tests findings are rationalized based on these simulation results.