Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 1 – microstructure
Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 1 – microstructure
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DOI：
10.3139/146.111708
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发表时间：
2018-11
影响因子：
0.8
通讯作者：
Piotr Łakoma;A. Ditze;C. Scharf
中科院分区：
文献类型：
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作者：
Piotr Łakoma;A. Ditze;C. Scharf
摘要含铝镁合金的腐蚀性能除了与杂质有关外，还与合金的显微组织有关。通过有针对性地控制晶粒尺寸、二次枝晶臂间距和偏析的数量和位置，可以改善腐蚀性能。为此，通过将具有0、3、6、9和12%铝的合金铸造到具有不同施加的冷却速率的模具中来进行实验。分析了样品的微观结构和成分，并模拟了晶粒尺寸和二次枝晶臂间距，作为铝含量和冷却速率的函数。结果表明，随着冷却速度的增加，晶粒尺寸和二次枝晶臂间距减小。偏聚的β相主要以离异共晶和片层形式存在于晶界处。对腐蚀性能的假设影响将在第2部分中进行研究。
Abstract Besides impurities in magnesium alloys containing aluminum, the microstructure also plays a role in the corrosion properties of the alloy. By targeted manipulation of grain size, secondary dendrite arm spacings and segregation in terms of amount and position, the corrosion properties are expected to be improved. For this, experiments were carried out by casting alloys with 0, 3, 6, 9, and 12 % aluminum into a mold with different applied cooling rates. The samples were analyzed regarding microstructure and composition, and the grain size and secondary dendrite arm spacings, as a function of aluminum content and cooling rate, were modeled. The results show a decrease in grain size and secondary dendrite arm spacings with an increased cooling rate. The segregated β phase was predominantly situated at the grain boundaries as divorced eutectic and in lamellar form. The assumed influences on the corrosion properties will be examined in Part 2.