Abstract
A novel CaMgSn phase with unique internal structure-granular covering structure—has been observed and investigated in Mg–Sn–Zn–Ca extruded alloys. SEM, XRD and TEM confirm that the as-extruded alloy consists of α-Mg, separate Mg2Sn nanophase and rode-like CaMgSn ternary phase. It is also demonstrated that CaMgSn phase mainly contains Mg2Sn and Mg2Ca phases, and Mg2Sn nanoparticles are wrapped in Mg2Ca inside CaMgSn phases which bases on the dynamic precipitation mechanism. In addition, the orientation relationships among Mg, Mg2Sn and Mg2Ca have been identified.
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