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Date of Publication:2022-10-09

Journal:Heat Treatment of Metals

Volume:45

Issue:11

Page Number:132-138

ISSN No.:0254-6051

Key Words:"high entropy alloy; annealing; microstructure; mechanical properties; texture"

CN No.:11-1860/TG

Abstract:Effect of annealing temperature on the microstructure and mechanical properties of Al_(0.2)CoCrFe_2Ni high entropy alloy with 80% cold rolling was studied.The crystal structure,texture type,and mechanical properties of the alloy were characterized by means of X-ray diffractometer ( XRD),electron backscatter diffractometer ( EBSD),and microelectronic testing machine,respectively.The results show that the alloy exhibits a stable FCC crystal structure at the as-cast,as-rolled and as-annealed states.The alloy has a typical dendritic structure at the as-cast state.After 80% rolling,significant rolling deformation bands appear,and recrystallization occurs in the subsequent annealing process.The volume fraction and grain size of recrystallized grains increase with the increase of annealing temperature.The alloy mainly exhibits ( 111) < 112 >texture after 80% rolling,and its texture intensity decreases with the increase of annealing temperature.The Al_(0.2)CoCrFe_2Ni high entropy alloy obtains greater tensile strength ( 1005 MPa) and lower plasticity ( 10%) after 80% rolling.As the annealing temperature increases,the strength of the alloy decreases and the plasticity increases,and the best comprehensive mechanical properties are obtained when annealed at 700 ℃,which mainly depends on the changes of dislocation density,recrystallization volume fraction and grain size,and the evolution of the recrystallization texture in the alloy.

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