· IngenierÃa ·
Q M Liu *, Y Zhang *, Y L Song *, F P Qi * and Q J Zhai*.
* School of Materials Science and Engineering, Shanghai University, P. R. China
67th World Foundry Congress
In this paper, the recent research progress conducted in the effect of
ultrasonic vibration on structure refinement of metals is briefly generalized.
As for Sn-Sb alloy, the matrix α phase can be obviously refined by the
ultrasonic treatment, with the broken and homogeneously dispersed
second-phase β (SnSb). For AZ81 Mg alloy, coarse grained equiaxed
structures are refined to spherical ones. As to ZL101 alloy, the introduction
of ultrasonic vibration into the melt can eliminate columnar dendrites and
refine the equiaxed grains. Employed EBSD and SEM, samples of
1Cr18Ni9Ti steel under various ultrasonic treatments are analyzed. The
results show that columnar grains is transmitted into equiaxed ones after
ultrasonically treated, with an increase of lattice defects. Furthermore, the
mechanism for structure refinement induced by ultrasonic vibration is
discussed.
