Effect of solid solution on microstructure of SiC/ZM5 magnesium alloy sprayed
into automotive copper mold
DING Lanhua1，JIN Huiling1，YANG Yanan2
1，College of Automotive and Mechanical Engineering，Zhoukou Vacational and Technical College，Zhoukou
466000，China； 2，College of Materials Science and Engineering，Henan University of Technology，Zhengzhou
450001，China
Abstract：The ZM5 magnesium alloy was prepared by spray casting of copper mold, and the SiC/ZM5 magnesium
alloy was prepared by adding SiC particles by mechanical compaction, which was strengthened by high temperature
solution process. The grain refining effect and microstructure evolution caused by adding SiC particles into
magnesium alloy were analyzed. The microstructure characteristics obtained under different solution temperatures
and the grain refining effect realized by SiC particles were tested and analyzed. The results show that α-Mg in
SiC/ZM5 magnesium alloy has the crystal structure of HCP, and the addition of SiC is helpful to obtain nucleation
points and achieve the effect of grain refinement. A large amount of Al and some Si exist in the grain boundary region.
The solution process can make the divorced eutectic β-Mg17Al12 structure formed at the grain boundary interdissolve
with the alloy matrix. The transformation of the second phase into other tissues can promote the transfer of
SiC particles and agglomerate in the grain boundary region. When the solution temperature is increased, the eutectic
phase of SiC/ZM5 magnesium alloy disappears faster and the hardness decreases.
2021, Vol. 31 
