The ingots of AlCrNiTiSi

x

（x=0

0.2

0.4

0.6

0.8

1） high-entropy alloys were fabricated by vacuum arc melting. The microstructure was analyzed through a combination of experiments and numerical simulations. The results reveal that AlCrNiTiSi

x

high entropy alloys present all typical of dendritic structures

and the dendrite region is composed of FCC-structured AlNi

2

Ti phase and Cr-rich Laves phase

while the interdendritic region consists of a solid solution phase of four elements. The increase of Si content has significant effect on the dendrite region

which results in the transformations from the AlNi

2

Ti phase to the AlNi phase

and the Cr-rich Laves phase to（Cr

Ti）

5

Si

3

phase. The interdendritic region is dominated by solid solutions of multiple elements. In addition

the hardness is increased with the addition of Si elements

which is attributed to the solid solution strengthening and the replacement of Laves phase by higher hardness（Cr

Ti）

5

Si

3

phase. The experimental results were basically consistent with the simulated ones

The γ phase and BCC phase predicted by the simulation didn’t appear in the experimental ones.