|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||HH-8: Microstructures and Mechanical Properties of Compositionally Complex Co-free FeNiMnCr18 Alloy with Simple Microstructure
||Zhenggang Wu, Hongbin Bei
|On-Site Speaker (Planned)
A FCC-structured single-phase alloy with a composition of FeNiMnCr18 was successfully developed. This near-equiatomic FeNiMnCr18 alloy has good malleability and its microstructure can be controlled by thermomechanical processing. By rolling and annealing, the as-cast elongated-grained-microstructure is replaced by homogeneous equiaxed grains. The mechanical properties of the FeNiMnCr18 alloy are comparable to those of the equiatomic FeNiCoMnCr high entropy alloy. Both strength and ductility increase with decreasing deformation temperature. Extensive twin-bands which are bundles of numerous individual twins are observed when it is tensile-fractured at 77 K. No twin bands are detected by EBSD for materials deformed at 293 K and higher. The unusual temperature-dependencies of UTS and uniform elongation could be caused by the development of the dense twin substructure, twin-dislocation interactions and the interactions between primary and secondary twinning systems which will result in a microstructure refinement and hence cause enhanced strain hardening and postponed necking.
||Planned: A print-only volume