Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 2, Pages 363-374Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(15)63612-3
Keywords
sand-cast; Mg alloys; solidification; microstructure; mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51275295]
- Funded Project of SAST-SJTU Joint Research Centre of Advanced Aerospace Technology, China [USCAST2012-15]
- Research Fund for the Doctoral Program of Higher Education of China [20130073110052]
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Influence of the pouring temperature ranging from 680 to 780 degrees C on the solidification behavior, the microstructure and mechanical properties of the sand-cast Mg-10Gd-3Y-0.4Zr alloy was investigated. It was found that the nucleation undercooling of the alpha-Mg phase increased from 2.3 to 6.3 degrees C. The average alpha-Mg grain size increased from 44 to 71 mu m, but then decreased to 46 mu m. The morphology of the eutectic compound transformed from a continuous network into a discontinuous state and then subsequently into an island-like block. The volume fraction of beta-Mg24RE5 phase increased and its morphology transformed from particle into rod-like. The increase in pouring temperature increased the solute concentration. YS increased from 138 to 151 MPa, and UTS increased from 186 to 197 MPa. The alloy poured at 750 degrees C had optimal combining strength and ductility. The fracture surface mode transformed from quasi-cleavage crack into transgranular fracture, all plus the dimple-like fracture, with the micro-porosity and the re-oxidation inclusion as major defects. The average alpha-Mg grain size played a main role in the YS of sand-cast Mg-10Gd-3Y-0.4Zr alloy, besides other factors, i.e. micro-porosity, morphology of eutectic compounds, re-oxidation inclusion and solute concentration.
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