Journal
MATERIALS & DESIGN
Volume 45, Issue -, Pages 300-307Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.09.003
Keywords
Magnesium alloy; Solidification; Microstructure; Mechanical properties
Categories
Funding
- Natural Science Foundation Project of China [51001046]
- Young Teacher Growth Fund of Hunan University [531107021095]
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Effects of cooling rate and pressure on microstructure and mechanical properties of sub-rapidly solidified Mg-6Zn-3Sn-2Al-0.2Ca alloy were investigated by OM, XRD, SEM and tensile testing. The alloy prepared by steel mould casting with no applied pressure is mainly composed of four phases i.e. alpha-Mg, Mg2Sn, MgZn and Mg-32(Al, Zn)(49), while those prepared by water-cooling steel mould casting under pressure and water-cooling copper mould casting under pressure consist of alpha-Mg, Mg2Sn, Mg51Zn20 and Mg-32(-Al, Zn)(49). The higher cooling rate promotes the formation of the grain boundary compounds, while the applied pressure has an inhibiting effect on it. The alloy prepared by water-cooling copper mould casting under pressure is characteristics of the finest grain size, the smallest dendrite arm spacing and the much finer, well-distributed second phases among the five as-studied alloys, exhibiting the optimal mechanical properties, with the ultimate tensile strength, the yield strength and elongation to rupture of 224 MPa, 157 MPa and 16.1% respectively. In comparison with the alloy prepared by steel mould casting with no applied pressure, the ductile fracture characteristics of void coalescence is dominant for the alloy prepared by water-cooling copper mould casting under pressure. (c) 2012 Elsevier Ltd. All rights reserved.
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