High-Temperature Mechanical Properties of NbTaHfTiZrV0.5 Refractory High-Entropy Alloys

The NbTaHfTiZrV0.5 is a refractory multi-principal-element alloy with high strength and good ductility at room temperature. It important for possible high-temperature applications to investigate the deformation mechanism of different temperatures using tensile tests. In this investigation, tests were conducted temperature 1273 K on sheet materials fabricated by cold rolling combined annealing treatments. At 473 K, exhibited (12%). testing range 673~873 was reduced, but yield remained above 800 MPa, which rare in most other alloys. TEM investigations revealed that dislocation slip controlled plastic deformation, degree closely related density. true stress–strain curves under conditions obtained (673~873 K) strain rates (0.001~0.0005 s−1). Experimental results utilized construct parameters constitutive model based traditional mathematical predict flow behavior temperatures. excellent mechanical properties will enable it be used several engineering applications.