|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Computational Design of Materials
||Computational Design and Simulation of Ultralow Modulus, Hysteresis-free, and Linear Pseudo-elastic Shape Memory Alloy
||Jiaming Zhu, Yipeng Gao, Dong Wang, Tong-Yi Zhang, Yunzhi Wang
|On-Site Speaker (Planned)
We show by computer simulations how to render a shape memory alloy (SMA) ultralow modulus, hysteresis-free and linearly pseudo-elastic by creating appropriate concentration modulation (CM) in the parent phase via spinodal decomposition and by pre-straining. The CM causes phase stability (M<SUB>s</SUB> or σ<SUB>Ms</SUB>) modulation, which suppresses autocatalysis in nucleation and imposes nano-confinement on growth during the martensitic transformation (MT) and, thus, tunes the otherwise sharp first-order transition into a broadly smeared, macroscopically continuous transition over a large stress range. The pre-straining yields residual martensitic embryos that are stable at the testing temperature (or device operating temperature) without applied load and act as operational nuclei in subsequent load cycles, eliminating completely stress-strain hysteresis and offering an ultralow apparent Young’s modulus. This study demonstrate a novel and universal approach to design new SMAs and GUM metals with unprecedented properties.
||Planned: Supplemental Proceedings volume