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Effects of Mn Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys

机译：锰锌添加量和冷却速率对Al-4.6Mg铸造合金力学性能和腐蚀性能的影响

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The mechanical properties of the Al-Mg alloy can be enhanced by adding metallic elements, but a continuous distribution of precipitates at grain boundaries leads to intergranular corrosion during sensitization treatment. In the present work, Mn, Zn additions, water cooling and furnace cooling were executed to investigate their effects on the mechanical and corrosion properties of the Al-4.6Mg alloy. Our results show that adding Mn to Al-4.6Mg alloys may produce grain refinement and dispersion strengthening, increasing tensile strength and hardness. The presence of Mn did not affect the corrosion resistance of Al-Mg alloys. Adding Zn to the Al-4.6Mg alloy increased tensile strength and hardness, but decreased corrosion resistance. Combined, the addition of Mn and Zn to the Al-4.6Mg alloy exhibited the highest tensile strength and hardness, but seriously reduced corrosion resistance. Furnace cooling substituted for water quenching could avoid intergranular corrosion, but slightly decreased the tensile strength and hardness by 7.0% and 6.8%, respectively.
机译：通过添加金属元素可以提高Al-Mg合金的机械性能，但是在晶界处析出物的连续分布会导致敏化处理期间的晶间腐蚀。在目前的工作中，进行了Mn，Zn的添加，水冷和炉冷，以研究它们对Al-4.6Mg合金的机械性能和腐蚀性能的影响。我们的结果表明，向Al-4.6Mg合金中添加Mn可能会产生晶粒细化和弥散强化，从而提高拉伸强度和硬度。 Mn的存在不影响Al-Mg合金的耐腐蚀性。在Al-4.6Mg合金中添加Zn可以提高抗拉强度和硬度，但会降低耐蚀性。结合起来，在Al-4.6Mg合金中添加Mn和Zn表现出最高的拉伸强度和硬度，但严重降低了其耐腐蚀性。炉冷却代替水淬可以避免晶间腐蚀，但抗拉强度和硬度分别略微降低了7.0％和6.8％。

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