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首页> 外文期刊>Journal of Materials Engineering and Performance >Pitting and Stress Corrosion Cracking Susceptibility of Nanostructured Al-Mg Alloys in Natural and Artificial Environments
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Pitting and Stress Corrosion Cracking Susceptibility of Nanostructured Al-Mg Alloys in Natural and Artificial Environments

机译：自然和人工环境下纳米结构Al-Mg合金的点蚀和应力腐蚀开裂敏感性

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摘要

The stress corrosion cracking (SCC) behavior of two developmental nanocrystalline 5083 alloys with varied composition and processing conditions was studied. The results were compared to a commercial aluminum AA 5083 (H111) alloy. The pitting densities, size and depths, and residual tensile strengths were measured after alternate immersion in artificial seawater and atmospheric exposure under different loading conditions. Optical and scanning electron microscopy (SEM) with EDX was used to analyze the fracture surfaces of failed specimen after removal at selected intervals and tensile testing. One of the nanostructured Al-Mg alloys exhibited significantly superior pitting resistance when compared to conventional microstructured AA 5083. Under conditions where pitting corrosion showed up as local tunnels toward phase inclusions, transgranular cracking was observed, whereas under conditions when pitting corrosion evolved along grain boundaries, intergranular cracking inside the pit was observed. Pit initiation resistance of the nano alloys appears to be better than that of the conventional alloys. However, long-term pit propagation is a concern and warrants further study. The objective of this investigation was to obtain information regarding the role that ultra-fine microstructures play in their degradation in marine environments and to provide insight into the corrosion mechanisms and damage processes of these alloys.
机译：研究了两种具有不同组成和加工条件的发展中纳米晶体5083合金的应力腐蚀开裂（SCC）行为。将结果与市售的AA 5083铝（H111）合金进行比较。在交替浸入人工海水和暴露于不同负荷条件下的大气中后，测量点蚀密度，尺寸和深度以及残余拉伸强度。以EDX进行的光学和扫描电子显微镜（SEM）用于分析以选定间隔取出并进行拉伸测试后的失效试样的断裂表面。与传统的微结构AA 5083相比，一种纳米结构的Al-Mg合金表现出明显优越的耐点蚀性。在点蚀出现为局部相向局部夹杂物的局部隧道的情况下，观察到晶界裂纹，而在点蚀沿晶界发展的情况下观察到了坑内的晶间裂纹。纳米合金的抗点蚀性似乎优于常规合金。但是，长期的坑传播是一个问题，需要进一步研究。这项研究的目的是获得有关超细微结构在海洋环境中降解中所起的作用的信息，并深入了解这些合金的腐蚀机理和破坏过程。

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