The effects of Zr

ultrasonic and compound treatment of Zr and ultrasonic on solidification structure of Mg

97

Y

2

Cu

1

alloy with long-period ordered structure were investigated comparatively.Meanwhile

the influences of different ultrasonic power

treating time and vibration temperature on solidifification structure of Mg

97

Y

2

Cu

1

alloy with compound treatment of Zr and ultrasonic were investigated.The results show that Zr or ultrasonic can refine solidification structure of Mg

97

Y

2

Cu

1

alloy significantly.Furthermore

effect of compound treatment on refinement of solidified structure exhibits desirable.Under the condition of compound treatment

when the ultrasonic power is at 0

9

00 Wor treating time is at 0

1

20s

with the increase of power or treating time

grain of the alloy is refined gradually.When the vibration temperature of ultrasonic is at 660

7

30 ℃

with the decrease of vibration temperature

grain of the alloy is refined gradually.