**About this Abstract** |

**Meeting** |
**2018 TMS Annual Meeting & Exhibition
** |

**Symposium
** |
**High Entropy Alloys VI
** |

**Presentation Title** |
G-33: Ab Initio Assisted Design of Quinary Dual-phase High-entropy Alloys with Transformation-induced Plasticity |

**Author(s)** |
Zhiming Li, Fritz Körmann, Blazej Grabowski, Jörg Neugebauer, Dierk Raabe |

**On-Site Speaker (Planned)** |
Fritz Körmann |

**Abstract Scope** |
We present five-component dual-phase (DP) high entropy alloys revealing transformation-induced plasticity (TRIP), designed by using a quantum mechanically based and experimentally validated approach. Ab initio simulations of thermodynamic fcc-hcp phase stabilities of Co20Cr20Fe(40-x)Mn20Nix (x=0-20 at. %) HEAs were performed to screen for promising compositions. The theoretical predictions reveal several promising TRIP-DP alloys, which have been cast and characterized. As a prototype example a non-equiatomic Co20Cr20Fe34Mn20Ni6 HEA, selected based on our ab initio simulations, reveals the TRIP-DP effect and hence exhibits higher tensile strength and strain-hardening ability compared to the corresponding equiatomic CoCrFeMnNi alloy. The ab initio approach is eventually employed to screen for potential alloys in a larger compositional window, namely for Co20Cr20Fe(1-x-y)MnxNiy alloys (5at.% < x,y < 35at.%). Complementary experiments allow to benchmark the performance of the theoretical scheme. |

**Proceedings Inclusion?** |
Planned: Supplemental Proceedings volume |