1. chaotic structure: the special feature of high entropy alloy is that it has chaotic crystal structure. This disorder leads to a large number of defects, grain boundaries and dislocations in the alloy. These defects will introduce uneven strain field into the crystal structure, which will lead to polarization.

2. Composition difference: High-entropy alloys are usually composed of at least five or more main elements, and the molar fractions of these elements are very close. However, even if the scores of elements are very close, there are still subtle differences in composition. This slight difference in composition will lead to the change of local chemical potential, which will lead to uneven and polarized local charge distribution.

3. Crystal defects: There are various types of crystal defects in high entropy alloys, such as point defects, line defects and surface defects. These defects will cause lattice distortion and uneven local charge distribution, which will lead to polarization.

4. Stress effect: Defects and disordered structures in high entropy alloys will lead to the existence of internal stress. These internal stresses can be released by polarization, resulting in uneven charge distribution.