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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of anodized layer thickness on fatigue behavior of magnesium alloy
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Effect of anodized layer thickness on fatigue behavior of magnesium alloy

机译：阳极氧化层厚度对镁合金疲劳行为的影响

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摘要

The process of anodizing has been adopted as an effective way to protect underlying material from corrosive environments. In the present study, since the corrosion protection ability would depend on thickness and quality of the anodized layer, effect of anodized layer thickness on fatigue behavior of AM60 magnesium alloy was investigated using three different anodized layer thicknesses of 15, 5 and 1 μm. The specimen with 15 μm thick anodized layer showed rough and irregular interface between substrate and anodized layer. Many defects were also observed in the anodized layer. But as the thickness of anodized layer was reduced from 15 to 5 to 1 μm, interface roughness was tended to be diminished. The role of interface roughness was reflected in the fatigue strength of three groups of specimens, where the specimen with the smoothest interface, 1 μm thick anodized specimen, showed the highest fatigue strength among the three groups. For the specimen with 15 μm thick anodized layer, the estimated value of AK at fatigue limit was almost equal to Δ K_(th) (≈0.86 MPam~(1/2)) while for the specimens with 5 and 1 μm thick anodized layers the estimated AK values were well below the ΔK_(th), where the initial crack should be considered as small crack. Well-known Kitagawa-Takahashi diagram for the present three kinds of anodizing layer thickness suggested that the anodizing layer thickness would be preferred less than 5 μm.
机译：阳极氧化工艺已被采用为保护底层材料不受腐蚀环境影响的有效方法。在本研究中，由于腐蚀防护能力取决于阳极氧化层的厚度和质量，因此使用三种不同的15、5和1μm阳极氧化层厚度研究了阳极氧化层厚度对AM60镁合金疲劳行为的影响。阳极氧化层厚度为15μm的样品在基材和阳极氧化层之间显示出粗糙且不规则的界面。在阳极氧化层中也观察到许多缺陷。但是，随着阳极氧化层的厚度从15μm减小至5μm，界面粗糙度趋于减小。界面粗糙度的作用反映在三组样品的疲劳强度中，其中界面最光滑的样品（厚度为1μm的阳极氧化样品）在三组样品中显示出最高的疲劳强度。对于阳极氧化层厚度为15μm的样品，在疲劳极限时AK的估计值几乎等于ΔK_（th）（≈0.86MPam〜（1/2）），而对于阳极氧化层厚度为5和1μm的样品，AK的估计值几乎等于ΔK_（th）（≈0.86MPam〜（1/2））估计的AK值远低于ΔK_（th），在此处应将初始裂纹视为小裂纹。当前三种阳极氧化层厚度的众所周知的北川高桥图表明，阳极氧化层厚度优选小于5μm。

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