Abstract
Effects of various Gd additions on the microstructure evolution, tensile properties and corrosion resistance of Mg–6Zn-0.5Ca–1Mn (ZMX6105) alloys were investigated. Results showed that the second phases of as-cast ZMX6105-xGd alloys (x = 0, 0.2, 1.0 wt%) were mainly composed of Mg7Zn3 phase, Ca2Mg6Zn3 phase, Mg3Zn6Gd phase. Gd addition promoted the formation of Ca2Mg6Zn3 phase during solidification, but decreased the fraction of Mg7Zn3 phase. Microstructure observation of as-extruded alloys revealed that Gd addition inhibited dynamic recrystallization, refined dynamic recrystallized (DRXed) grains and strengthened basal texture. As-extruded ZMX6105-0.2Gd alloy exhibited excellent tensile properties with yield strength of 276 MPa, ultimate tensile strength of 354 MPa and elongation of 11%, and simultaneously had optimal corrosion resistance with corrosion rate of 22.06 mm/year based on the weight loss tests in 3.5 wt% NaCl solution.
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