In this paper, microstructure and mechanical properties of AZ61 magnesium alloys with the Y and Ca combined addition were investigated. The results exhibit that the addition of Y and Ca into AZ61 alloy leads to effective refinement of the microstructure and additional block-like Al2Y and long-rod Al2Ca phases found in AZ61–1.2Y alloy and AZ61–1.2Y–1.0Ca alloy, respectively. The tensile strength, elongation and creep properties of AZ61–Y–Ca alloy are significantly increased by the addition of Y and Ca. The tensile strength of AZ61–1.2Y–1.0Ca alloy at 20 and 175 °C is up to 225 and 175 MPa, and compared with AZ61 alloy, the strengths of the alloy are enhanced by 37 and 80%, respectively. AZ61–1.2Y–1.0Ca alloy achieves the lowest steady creep rate 2.5027 × 10−7 s−1 that is about 4 times lower than that of AZ61 alloy. The poor mechanical properties of AZ61 magnesium alloy is attributed to the softening of β-phase Mg17Al12, especially at elevated temperature. The tensile strength and creep resistance of AZ61–1.2Y–1.0Ca alloy are effectively improved by the Al2Ca and Al2Y phases.
AZ61 alloy mechanical properties Y Ca microstructure
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This research was financially supported by the funding of the National Natural Science Foundation of China (NSFC-Henan Joint Fund of Personnel Training, U1404501), National Natural Science Foundation of China (51571084) and Natural science research project of Henan Provincial Department of Education (16A430036).
S.M. Zhu, M.A. Easton, M.A. Gibson, M.S. Dargusch, J.F. Nie, Mater. Sci. Eng. A 578, 377–382 (2013)CrossRefGoogle Scholar
S.M. Zhu, M.A. Gibson, J.F. Nie, M.A. Easton, T.B. Abbott, Scripta Mater. 58, 477–480 (2008)CrossRefGoogle Scholar