Effect of Annealing Time on the Microstructure and Mechanical Properties of the AlCrFeNi_2Ti_(0.5) High Entropy Alloys

摘要

As-cast AlCrFeNi_2Ti_(0.5) high entropy alloy was annealed at 600 ℃ and 800 ℃ for 6 h, 12 h and 24 h, respectively. The effect of annealing time on the microstructure and mechanical properties were investigated intensively. The as-cast sample showed a fine and homogeneous microstructure, and owned an excellent ductility of 16.3%. While the 600 ℃, 12 h annealed sample showed the highest compressive strength of 2658 MPa and yield strength of 2046 MPa. The mechanical properties of the samples after 800 ℃ annealed for 12 h and 24 h deteriorated obviously. High annealing temperature promotes the growth of the crystal grains, and the new generated FeCr-type intermetallic phase leads to the embrittlement of the alloy.