Corrosion resistance of model ultrafine-grained Al–Li alloys produced by severe plastic deformation

Dolega, Łukasz; Adamczyk‐Cieślak, Bogusława; Mizera, J.; Kurzydłowski, Krzysztof J.

doi:10.1007/s10853-011-6133-0

Cited by 20 publications

(7 citation statements)

References 41 publications

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“…Corrosion behavior has been investigated on UFG materials fabricated mainly by processing of SPD such as ECAP, ARB, HPT for aluminum and its alloy, [87][88][89][90][91][92][93]120,121,143,[150][151][152][153]156,[158][159][160][161][162][163][164][165][166][167][168][169][170][171] magnesium and its alloy, 34,72,[115][116][117]122,123,154,157,[172][173][174][175][176][177][178][179] copper and its alloy, 6,[96][97][98]…”

Section: General Descriptionmentioning

confidence: 99%

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Miyamoto

2016

Mater. Trans.

114

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Corrosion of ultra ne grain (UFG) materials by severe plastic deformation (SPD) is reviewed in light of the existing literature and microstructural change. Fortunately, by holistic survey of the literature, it seems likely that grain re nement by SPD, while enhancing mechanical properties, does not compromise the overall corrosion resistance, and in many case, improve it in comparison with coarse-grained counterparts, although there are some contradictory results within the same materials and same environment. The degree of impact of UFG formation on corrosion is highest in stainless steels followed by aluminum and magnesium alloys whereas it is relatively marginal in pure copper and titanium. The effect of UFG formation by SPD on corrosion is imparted by not only grain re nement, but also other microstructural change occurring commonly in SPD in general and unique to each speci c SPD method. In this review, an attention is paid speci cally to the former case, and this includes shuf ing or redistribution of chemical inhomogeneity into a ner scale, deformation-induced grain boundaries and high internal stress stemming from these grain boundaries. The literature on stress corrosion cracking (SCC) of UFG materials are de nitely insuf cient to nd the general trends, more studies are waited.

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Section: General Descriptionmentioning

confidence: 99%

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Miyamoto

2016

Mater. Trans.

114

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“…Dislocations created during deformation reduced the energy barrier for electrochemical reactions. Nanocrystallization was found to change the surface condition of the alloys, but also effectively increase the activity of metallic atoms and accelerate the corrosion rate [15]. The activation barrier to dissolution from nanocrystalline Ni surfaces is higher compared to bulk Ni, thereby resulting in improved corrosion resistance for nanostructured surfaces compared to bulk surfaces.…”

Section: -4mentioning

confidence: 99%

Corrosion behavior of HPT-deformed TiNi alloys in cell culture medium

Shri

Tsuchiya

Yamamoto

2017

AIP Conference Proceedings

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Abstract. In recent years there are growing interest in fabrication of bulk nanostructured metals and alloys by using severe plastic deformation (SPD) techniques as new alternative in producing bulk nanocrystalline materials. These techniques allows for processing of bulk, fully dense workpiece with ultrafine grains. Metal undergoes SPD processing in certain techniques such as high pressure torsion (HPT), equal-channel angular pressing (ECAP) or multi-directional forging (MDF) are subjected to extensive hydrostatic pressure that may be used to impart a very high strain to the bulk solid without the introduction of any significant change in overall dimension of the sample. The change in the structure (small grain size and high-volume fraction of grain boundaries) of the material may result in the corrosion behavior different from that of the coarse-grained material. Electrochemical measurements were done to understand the corrosion behavior of TiNi alloys before and after HPT deformation. The experiment was carried out using standard three electrode setup (a sample as working electrode; a platinum wire as a counter electrode and a saturated calomel electrode in saturated KCl as a reference electrode) with the surface area of 26.42 mm 2 exposed to the EMEM+10% FBS cell culture medium. The measurements were performed in an incubator with controlled environment at 37 °C and 5% CO 2 , simulating the cell culture condition. The potential of the specimen was monitored over 1 hour, and the stabilized potential was used as the open-circuit potential (EOCP). Potentiodynamic curves were scanned in the potential range from −0.5 V to 1.5 V relative to the EOCP, at a rate of 0.5 mV/s. The result of OCP-time measurement done in the cell culture medium shows that the OCP of HPT-deformed samples shifts towards to the more positive rather than that of BHPT samples. The OCP of deformed samples were ennobled to more than +70 mV for Ti-50mol%. The shift of OCP towards the nobler direction indicates the passive nature of native oxides formed on the surface of the samples. The polarization curve, on the other hand, indicates that the HPT deformation was found to shift the passive current to nobler region. The passive region current density is found to be lower than that of the BHPT, suggesting the passive film formed on the surface of HPT-deformed samples is more protective than that of the BHPT sample. This study has shown that nanocrystallization and amorphization induced by severe plastic deformation change the corrosion behavior of TiNi alloys.

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“…Hydrogen also causes no pollution and produces almost threefold the gravimetric heat of combustion of gasoline [5][6][7][8][9]. Hydrogen generation has been extensively investigated by the reaction of aluminum-based system with water [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Russo et al [13] studied the dynamics associated with the dissociation of water on an aluminum nanocluster using the ReaxFF reactive force field.…”

Section: Introductionmentioning

confidence: 99%

Generating H2 from a H2O molecule by catalysis using a small Al6Cu cluster

Yang

Han

et al. 2016

Energy

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Only one H atom is extracted from a single H2O molecule in a usual reaction for hydrogen generation. In this study, a three-step reaction has been identified for completely extracting H2 from H2O molecule with the catalysis of a small Al6Cu cluster, based on the first principles calculations. All the reactants, products, and transition states are determined by optimization calculation and confirmed by frequency analysis. The intrinsic reaction coordinate is also calculated to validate the reaction process. Results show that the whole reaction is an endothermic reaction. The charge distribution is used to understand the novel reaction. It is found that Al6Cu cluster can strongly capture H2O molecule and extract the H2 molecule completely, which may present a more efficient way to generate H2 from a single H2O molecule.

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Corrosion resistance of model ultrafine-grained Al–Li alloys produced by severe plastic deformation

Cited by 20 publications

References 41 publications

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Corrosion behavior of HPT-deformed TiNi alloys in cell culture medium

Generating H2 from a H2O molecule by catalysis using a small Al6Cu cluster

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