Study on Microstructure and Solidification Process of Quasicrystal Reinforced Mg-Zn-Y Alloy
The microstructure and solidification process of Mg-9.02Zn-1.68Y alloy were studied by SEM,XRD,DSC and Factsage 8.0 thermodynamic calculation software.The results show that the room temperature microstructure of Mg-9.02Zn-1.68Y alloy is mainly composed of α-Mg,quasicrystalline I-Mg7Zn6Y and Mg7Zn3.The solidification process of Mg-9.02Zn-1.68Y alloy is that dendritic α-Mg is crystallized first,then binary eutectic transformation takes place to form(α-Mg+I-Mg7Zn6Y)eutectic structure,and finally a small amount of(α-Mg+Mg7Zn3)eutectic structure is formed with the decrease of temperature.Due to the high content of quasicrystalline I-Mg3Zn6Y phase in the experimental alloy,the hardness of the alloy is HV70,which lays a good foundation for subsequent reprocessing or heat treatment.
Mg-Zn-Y alloyquasicrystal strengtheningmicrostructuresolidification process
国家科技期刊平台
NSTL
万方数据
