|About this Abstract
||MS&T22: Materials Science & Technology
||High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond III
||Revealing Phase Transformation and Deformation Behavior in a B2-base High-Entropy Alloy by In-situ Neutron Diffraction
||Rui Feng, Peter Liaw, Ke An
|On-Site Speaker (Planned)
Ordered intermetallic compounds have long been of interest as potential structural materials for use at elevated temperatures. In particular, B2 aluminides exhibit a wide range of interesting properties, such as high ordering temperature, corrosion resistance, and pseudo-elasticity effect. However, the lack of room-temperature ductility limits their applications due to an insufficient number of independent slip systems and poor grain-boundary (GB) cohesion. Recently, ductile multicomponent intermetallics have been achieved by the high-entropy alloy (HEA) concept. Here we design a B2-base HEA with a minor ductile face-centered-cubic (FCC) phase as a GB adhensive phase. The improved slip capability and stress-induced martensitic transformation of the multicomponent B2 phase are evidenced by in-situ neutron diffraction and transmission-electron microscopy. Together with the GB-strengthener, the tensile ductility of the designed alloy is enhanced to some extent. This work offers insights into alloy-design strategies that could improve the ductility of intermetallic alloys and accelerate their engineering applications.