Corrosion behaviour and hardness of in situ consolidated nanostructured Al and Al–Cr alloys produced via high-energy ball milling

Gupta, Rajeev; Fabijanic, Daniel; Zhang, Ruifeng; Birbilis, Nick

doi:10.1016/j.corsci.2015.06.011

Cited by 63 publications

(23 citation statements)

References 64 publications

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“…The OCP-time curves of the USRP-treated samples were consistent with a hypothesis proposed by several scholars [32,51], i.e., a dense and easily passivized oxide film formed after severe plastic deformation treatment leads to an anodic shift in the OCP. The Mott-Schottky analysis confirmed that, compared with the passive film on the BM sample, the film formed on the USRP-treated samples was thicker and characterized by a lower acceptor density.…”

Section: Initiation Of Pittingsupporting

confidence: 89%

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Liu

Zhang

et al. 2020

Materials

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The effects of an ultrasonic surface rolling process (USRP) on the localized corrosion behavior of 7B50-T7751 aluminum alloy in a sodium chloride + hydrogen peroxide solution were investigated through microstructural observation, immersion testing, and electrochemical measurements. The results revealed that this alloy is prone to pitting. However, the localized corrosion resistance can be significantly improved via both one-pass USRP and 12-pass USRP treatment. Furthermore, in the test solution, the thickness and the acceptor density of the passivation film were affected by the USRP treatment. The improved corrosion resistance of one-pass USRP-treated samples resulted mainly from the introduced compressive residual stress. However, this stress played a secondary role in the considerable enhancement observed for the corrosion resistance of the 12-pass USRP-treated samples. This enhancement is attributed primarily to the nanocrystalline surface and homogeneous surface microstructure induced by the multiple-pass USRP treatment.

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Section: Initiation Of Pittingsupporting

confidence: 89%

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Liu

Zhang

et al. 2020

Materials

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“…The large driving force for grain coarsening poses an additional challenge for the synthesis of NC powders into a monolithic NC solid. Usually, various ex-situ consolidation processes (viz., uniaxial compaction followed by sintering [7,11] using conventional and/or microwave process) and in-situ consolidation processes (viz., hot compaction, hot-isostatic pressing [30], and spark plasma sintering [31]) are used for the consolidation of MC powder. Among these consolidation techniques, spark plasma sintering (SPS) is quite promising for the synthesis of bulk NC materials [15] due to its rapid sintering.…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

et al. 2017

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Structural changes during the deformation-induced synthesis of nanocrystalline Fe–10Cr–3Al alloy powder via high-energy ball milling followed by annealing and rapid consolidation by spark plasma sintering were investigated. Reduction in crystallite size was observed during the synthesis, which was associated with the lattice expansion and rise in dislocation density, reflecting the generation of the excess grain boundary interfacial energy and the excess free volume. Subsequent annealing led to the exponential growth of the crystallites with a concomitant drop in the dislocation density. The rapid consolidation of the as-synthesized nanocrystalline alloy powder by the spark plasma sintering, on the other hand, showed only a limited grain growth due to the reduction of processing time for the consolidation by about 95% when compared to annealing at the same temperature.

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“…The increase in the polarization resistance of the alloy could be attributed to the presence of Fe and Cr in solid solution with Al after milling, which eventually led to the formation of intermetallics Al 6 Fe, Al 13 Fe 4 and Al 13 Cr 2 during compaction and sintering process (shown in Figure 2). As mentioned earlier, the presence of intermetallics in the microstructure of the alloy are believed to increase the corrosion resistance of the alloy [16][17][18]. In addition, the presence of Al 2 O 3 , Fe 2 O 3 and Cr 2 O 3 was observed in XRD peak profiles of corroded sample.…”

Section: Methodsmentioning

confidence: 77%

“…The observed enhancement in the resistance values was attributed to the nanocrystalline structure, successful addition of alloying element (Chromium) and the formation of Al-Cr intermetallics [16]. Another investigation on the corrosion resistance of the fabricated nanocrystalline Al-xCr alloy reported an increase in the corrosion resistance of the alloy when compared to the corrosion resistance of pure Al [17]. Similarly, an investigation on the influence of cooling rate on the microstructure and corrosion behavior of Al-Fe alloy has reported an increase in the corrosion resistance of the alloy with cooling rate.…”

Section: Introductionmentioning

confidence: 94%

The Influence of Transition Metals Addition on the Corrosion Resistance of Nanocrystalline Al Alloys Produced by Mechanical Alloying

Seikh

Baig

Ammar

et al. 2016

Metals

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Abstract:The corrosion resistance of nanocrystalline Al, Al-10 wt. % Fe and Al-10 wt. % Fe-5 wt. % Cr alloys was investigated in 3.5% NaCl solution using cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) techniques. The alloys were fabricated using mechanical alloying (MA) and heat induction sintering. When compared with the corrosion resistance of pure Al, the experimental results indicated that the addition of 10 wt. % Fe and 10 wt. % Fe-5 wt. % Cr to pure Al has resulted in an enhancement in the corrosion resistance of these newly fabricated alloys. The resistance to corrosion is due to enhanced microstructural stability along with the formation of stable oxide layer.

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Corrosion behaviour and hardness of in situ consolidated nanostructured Al and Al–Cr alloys produced via high-energy ball milling

Cited by 63 publications

References 64 publications

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

The Influence of Transition Metals Addition on the Corrosion Resistance of Nanocrystalline Al Alloys Produced by Mechanical Alloying

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