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Effect of Y on microstructure and corrosion resistance of AZ61 magnesium alloy

机译：Y对AZ61镁合金微观结构和耐腐蚀性的影响

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摘要

The effect of Y addition on the microstructure of AZ61 alloy was investigated by optical microscopy (OM), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The corrosion behavior of AZ61 alloy with Y addition in 3.5% NaCl solution was studied by static weight loss and polarization curves corrosion tests. The results show that AZ61 alloy with Y addition can refine grain size of the matrix and alter the distribution of the phase β-Mg_(17)Al_(12) from continuous network morphology transition to small and dispersive distribution along the grain boundary by forming the second phase Al_2Y which has a high melting point. In addition, the addition of Y can decrease the corrosion current density of AZ61 magnesium alloy in 3.5% NaCl solution, thereby improving the corrosion resistance of AZ61 magnesium alloy. Results show that AZ61 magnesium alloy with 1.0% Y has the most refined microstructure and the best corrosion resistance.
机译：通过光学显微镜（OM），X射线衍射分析（XRD）和扫描电子显微镜（SEM）研究了Y添加对AZ61合金微观结构的影响。通过静态重量损失和极化曲线腐蚀试验研究了AZ61合金与Y添加的AZ61合金的腐蚀行为。结果表明，AZ61合金与Y添加可以细化基质的晶粒尺寸，并通过形成沿晶界的连续网络形态转变来改变相位β-Mg_（17）AL_（12）的分布通过形成具有高熔点的第二相Al_2Y。另外，添加Y可以降低3.5％NaCl溶液中AZ61镁合金的腐蚀电流密度，从而提高AZ61镁合金的耐腐蚀性。结果表明，1.0％Y的AZ61镁合金具有最精细的微观结构和最佳耐腐蚀性。

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