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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Correlation of hardness and corrosion characteristics with crystalline structures of Al-Mg alloys
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Correlation of hardness and corrosion characteristics with crystalline structures of Al-Mg alloys

机译：铝镁合金硬度和腐蚀特性与晶体结构的关系

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摘要

The aim of this work is to contribute to the understanding of the effects of crystalline structures on the hardness and corrosion characteristics of aluminium-magnesium alloys. So, a series of nominal Al-4, 16, 40 and 50 wt% Mg compositions was rapidly cooled at ambient temperature by a vacuum high-frequency induction magnetic melting process and characterized by means of x-ray diffraction and optical observation analyses as well as Vickers indentation testing and electrochemical measures. Measured hardness and corrosion characteristics were compared with that of pure aluminium and industrial steel sheets. It was found that the crystalline microstructures consist of the intermetallic compounds fcc β-Al_3Mg_2 and sc γ-Al_(12)Mg_(17) phases in equilibrium with the solid solution fcc α-Al of the matrix. Surface morphologies exhibit fine textures for the lower Mg contents and dendritic-eutectic microstructures for the higher contents. Observed combined high microhardness strengthening and corrosion resistance of aluminium matrix by magnesium contents are essentially due to the hardening cfc β-Al_3Mg_2 phase precipitation in the binary Al-Mg alloys.
机译：这项工作的目的是有助于理解晶体结构对铝镁合金硬度和腐蚀特性的影响。因此，一系列标称的Al-4、16、40和50 wt％的Mg组合物通过真空高频感应磁熔工艺在环境温度下快速冷却，并通过X射线衍射和光学观察分析进行表征作为维氏压痕测试和电化学措施。将测得的硬度和腐蚀特性与纯铝和工业钢板的硬度和腐蚀特性进行了比较。发现晶体的微观结构由与基质的固溶体fccα-Al平衡的金属间化合物fccβ-Al_3Mg_2和scγ-Al_（12）Mg_（17）相组成。 Mg含量较低时，表面形貌表现出良好的织构;而Mg含量较高时，表面形态则表现出树枝状的共晶组织。通过镁含量观察到的铝基体的高显微硬度增强和耐蚀性能的结合主要归因于二元Al-Mg合金中的cfcβ-Al_3Mg_2相硬化。

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