In order to study the phase change of high entropy alloy before and after annealing,AlCoCrCuFe alloys were annealed at 800 ℃ and 1000 ℃ respectively,and their phase structures were analyzed by X-ray diffractometer and its attached MDI Jade software.The results show that the phases of AlCoCrCuFe alloys are composed of BCC main phase and FCC phase at different annealing temperatures.The space group,lattice constant,cell volume,density and relative content of BCC main phase and FCC phase of AlCoCrCuFe annealed at room temperature,800 ℃ and 1000 ℃ are obtained by whole pattern fitting,Rietveld refinement and cell refinement.The refinement errors are 3.13％,2.37％and 2.36％,respectively.The diffraction peak angle and full width at half maxima(FWHM)of AlCoCrCuFe alloy increases with the increase of annealing temperature,which is caused by cell distortion and relative content change of alloy phase owing to the larger radius atoms entering the lattice and the widening of the nucleus size distribution respectively.
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