|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||The Role of GNDs in Memory Response of FCC and BCC Metals during Deformation
||Tristan Russell, David Fullwood, Robert Wagoner, Sobhan Nazari Tiji, Guowei Zhou
|On-Site Speaker (Planned)
Recent work suggests that many “memory” aspects of metal behavior such as Bauschinger effect and anelasticity, are consequences of internal stresses that develop as GNDs. In order to test this hypothesis, tensile experiments were performed with single crystal, bicrystal, and multicrystal samples of BCC Tantalum and FCC Nickel. DIC was also performed on the multicrystal samples using a gold remodeling technique to provide more data. The results of these tests were compared with predictive crystal plasticity simulations with and without the stress fields of GNDs accounted for. The results show that simulations with GNDs predict the form of anelasticity seeds in stress cycles, but underpredict the magnitude of the hysteresis. Identical simulations without GNDs predict essentially no hysteresis, 3 orders of magnitude smaller than observed. A tentative conclusion was reached: memory aspects arise from the internal stress from GNDs, but some aspects of their calculation are not fully understood.
||Modeling and Simulation, Copper / Nickel / Cobalt, Characterization