Obvious change of crystal structure in ZA27 alloy was observed under the high pressure more than 1GPa.The change rule of crystal structure in ZA27 aluminum alloy was revealed by XRD（X-ray diffraction）at different high pressures.The results reveal that with increasing in pressure

the crystal face distance and lattice constant of Al-rich α phase are decreased.Compared with those of one at normal pressure

the crystal face distances of Al-rich α phase at（200）

（220）and（311）crystal face are reduced 1.07%

1.15% and 1.43% at 5GPa pressure

respectively

and lattice constant is reduced from 4.04800 to 4.00468.