Effects of untreated

ultrasonic

Zr modification

compound treatment of Zr and ultrasonic were investigated on solidified structure and compressive properties of Mg-5 Y-2.5 Zn-1.2 Ca alloy enhanced by long period structure. Effects of ultrasonic power and processing time on the alloy with compound treatment were also analyzed. The results show that ultrasonic treatment

Zr treatment and compound treatment can all improve solidified structure and mechanical properties of the alloy

among which the compound treatment has the satisfied effect. Compared with those of the untreated alloy

the compressive strength and the compressive rate of the alloy with compound treatment are increased by 15.3%and 15.7%

respectively. With the increase of ultrasonic power in the range of 0～900 W

primary phase in the alloy is refined at first and then coarsened

and the turning point is 700 W. In the range of 0～90 s

with the increase of ultrasonic processing time

primary phase in the alloy is refined at first and then coarsened

and the turning point is 60 s. With decreasing in the grain size

the distribution of the second phase is presented more uniform

and the compressive strength is increased.