School of Mechanical&Electrical Engineering;
Wuhan Institute of Technology;
Wuhan 430073;
China;
School of Metallurgic Engineering;
Anhui University;
of Technology;
Ma'anshan 243002;
China;
Maanshan Ruihui Industrial Co.;
Ltd.;
Ma'anshan 243002;
China;
AZ91D magnesium alloy; expendable pattern shell casting; mechanical vibration; microstructure; mechanical properties;