【摘 要】
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The microstructure and mechanical properties of as-cast Mg-3.8Zn-2.2Ca alloy with different Ce contents were investigated by both optical and electron microscop
【机 构】
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Materials Science and Engineering College,Key Laboratory of Automobile Components Manufac-turing and
论文部分内容阅读
The microstructure and mechanical properties of as-cast Mg-3.8Zn-2.2Ca alloy with different Ce contents were investigated by both optical and electron microscopy,X-ray diffraction,differential scanning calorimetry analysis,tensile and creep tests.The results indicated that adding 0.41 wt.％-1.83 wt.％ Ce could refine the grains of the alloy,and the grain size gradually decreased as the Ce content increased.Furthermore,addition of either 0.41 wt.％ or 0.89 wt.％ Ce caused the morphology of the Ca2Mg6Zn3 phase to change partially fromsemi-continuous block to discrete fine particles.However,after adding 1.83 wt.％ Ce,portions of the Ca2Mg6Zn3 and Mg12Ce phases were mixed and this Ca2Mg6Zn3+Mg12Ce eutectic changed to a different coarse semi-continuous morphology.In addition,addition of 0.41wt.％-1.83 wt.％ Ce improved the tensile and creep properties of the alloy.Amongst these Ce-containing alloys,the alloy with 0.89 wt.％ Ce exhibited the best ultimate tensile strength and elongation while the alloy with 1.83 wt.％ Ce had the best yield strength and creep properties.
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