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Simultaneous improvement of strength, ductility and corrosion resistance of Al2024 alloy processed by cryoforging followed by ageing

机译:通过冷铸和时效处理同时改善Al2024合金的强度,延展性和耐蚀性

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摘要

The aim of the present study is to simultaneous improvement of strength and ductility as well as corrosion resistance of ultrafine grained 2024 Al-alloy processed by multiaxial cryoforging (MAF) and cryorolling followed by ageing. The evolution of ultrafine grained microstructure during MAF followed by ageing is investigated using optical and transmission electron microscopy. Both multiaxially forged (MAFed) and cryorolled (CRed) samples showed an improvement in yield strength (YS) with a corresponding decrease in the ductility. Aging treatment not only improved the YS, but also its ductility. Improvement in the ductility after ageing is confirmed by the fractography analysis. Corrosion resistance of the MAFed+aged samples found to be higher compared to that of the MAFed and coarse grained counterpart The corrosion behavior has been analyzed in the light of open circuit potential (OCP), so-lutionizing, grain size and precipitation strengthening mechanisms. SEM images of the corroded samples also corroborated the corrosion test results.
机译:本研究的目的是要同时提高强度和延展性,以及通过多轴冷组织(MAF)和冷轧后进行时效处理的超细晶粒2024铝合金的耐蚀性。使用光学和透射电子显微镜研究了MAF过程中超细晶粒组织的变化,然后进行了时效处理。多轴锻造(MAFed)和冷轧(CRed)样品均显示出屈服强度(YS)的改善,同时延展性相应降低。时效处理不仅改善了YS,还改善了其延展性。通过断层扫描分析证实了老化后延展性的改善。已发现MAFed +时效样品的耐蚀性要高于MAFed和粗粒对口样品的耐蚀性。已根据开路电势(OCP),溶质化,晶粒尺寸和析出强化机制分析了腐蚀行为。腐蚀样品的SEM图像也证实了腐蚀测试结果。

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