Microstructure and Mechanical Property Evolution Mechanism of Ti45.5Nb45.5Al4.5Cr4.5 High Entropy Alloy
Ti45.5Nb45.5Al4.5Cr4.5 lightweight refractory high entropy alloy was produced by vacuum consumable electrode arc furnace,and the microstructure and mechanical properties were systematically investigated after cold rolling and annealing heat treatment.The as-cast Ti45.5Nb45.5Al4.5Cr4.5 high entropy alloy is an isometric crystal structure with large grain size,and the deformation zone structure generated by grain elongation and deformation appeared after cold rolling and annealing at 700℃,and a heterogeneous structure consisting of large grains and fine recrystallized grains appears in the region of the deformation zone after annealing at 800℃,and the complete recrystallization of the region of the deformation zone occurs after annealing at 900℃,and Nb-rich phase segregation appears.After cold rolling and annealing at 800℃,the strength and plasticity of the alloys are simultaneously increased,and the yield strength and elongation are 823 MPa and 14.64%,which are 21.57%and 119.82%higher than those of the cast alloys,respectively.
high entropy alloyheterogeneous structuremechanical propertiesmicrostructure
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