DSC and TEM analysis of lattice defects governing the mechanical properties of an ECAP-processed magnesium alloy

Mingler, Bernhard; Kulyasova, Olya B.; Исламгалиев, Р. К.; Korb, G.; Karnthaler, H. P.; Zehetbauer, M.

doi:10.1007/s10853-006-0977-8

Cited by 17 publications

(12 citation statements)

References 14 publications

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“…These remnant point defects should have been produced during the SPD process. A similar conclusion was derived for a SPD processed Mg(Al) alloy from the observation of an irreversible exothermic reaction in the temperature range between 370 and 450 K where no change of the microstructure according to TEM occurred [7].…”

Section: Introductionsupporting

confidence: 79%

Free volumes in bulk nanocrystalline metals studied by the complementary techniques of positron annihilation and dilatometry

Würschum

Oberdorfer

Steyskal

et al. 2012

Physica B: Condensed Matter

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Free-volume type defects, such as vacancies, vacancy-agglomerates, dislocations, and grain boundaries represent a key parameter in the properties of ultrafine-grained and nanocrystalline materials. Such free-volume type defects are introduced in high excess concentration during the processes of structural refinement by severe plastic deformation. The direct method of time-differential dilatometry is applied in the present work to determine the total amount and the kinetics of free volume by measuring the irreversible length change upon annealing of bulk nanocrystalline metals (Fe, Cu, Ni) prepared by high-pressure torsion (HPT). In the case of HPT-deformed Ni and Cu, distinct substages of the length change upon linear heating occur due to the loss of grain boundaries in the wake of crystallite growth. The data on dilatometric length change can be directly related to the fast annealing of free-volume type defects studied by in situ Doppler broadening measurements performed at the high-intensity positron beam of the FRM II (Garching, Munich, Germany).

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Section: Introductionsupporting

confidence: 79%

Free volumes in bulk nanocrystalline metals studied by the complementary techniques of positron annihilation and dilatometry

Würschum

Oberdorfer

Steyskal

et al. 2012

Physica B: Condensed Matter

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“…The exothermic peaks at 130–165 °C and 240 °C are irreversible and don't appear in a second heating cycle. The two exothermic peaks can be attributed to the reordering of the crystals and the rearrangements of the vacancies formed due to the doping of Zn into the CuO crystal 22–24. Another possibility is that in addition to crystalline Zn‐doped CuO an amorphous product is also obtained.…”

Section: Resultsmentioning

confidence: 99%

Eradication of Multi‐Drug Resistant Bacteria by a Novel Zn‐doped CuO Nanocomposite

Malka

Perelshtein

Lipovsky

et al. 2013

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134

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Zinc-doped copper oxide nanoparticles are synthesized and simultaneously deposited on cotton fabric using ultrasound irradiation. The optimization of the processing conditions, the specific reagent ratio, and the precursor concentration results in the formation of uniform nanoparticles with an average size of ≈30 nm. The antibacterial activity of the Zn-doped CuO Cu₀.₈₈Zn₀.₁₂O in a colloidal suspension or deposited on the fabric is tested against Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) bacteria. A substantial enhancement of 10,000 times in the antimicrobial activity of the Zn-CuO nanocomposite compared to the pure CuO and ZnO nanoparticles (NPs) is observed after 10 min exposure to the bacteria. Similar activities are observed against multidrug-resistant bacteria (MDR), (i.e., Methicillin-resistant S. aureus and MDR E. coli) further emphasizing the efficacy of this composite. Finally, the mechanism for this enhanced antibacterial activity is presented.

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“…59 The results are shown in Fig. 11 where four peaks are visible in the DSC curves of the ECAP samples.…”

Section: Magnesiummentioning

confidence: 97%

Using differential scanning calorimetry as an analytical tool for ultrafine grained metals processed by severe plastic deformation

Gao

Starink

Langdon

2009

Materials Science and Technology

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Differential Scanning Calorimetry (DSC) is a thermal analysis technique that measures the energy absorbed or released by a sample as a function of temperature or time. Analysis by DSC has wide applications for examining solid-state reactions and solid-liquid reactions in many different materials. Quantitative analyses of the kinetics of reactions may be assessed by reviewing the interrelation between activation energy analysis methods. In recent years, DSC has been applied in the examination and analysis of bulk ultrafine-grained materials processed through the application of Severe Plastic Deformation (SPD). This overview examines these recent reports with reference to materials processed using the procedures of Equal-Channel Angular Pressing (ECAP), High-Pressure Torsion (HPT) and Accumulative Roll-Bonding (ARB). In addition, some critical issues related to DSC analysis are also discussed.

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DSC and TEM analysis of lattice defects governing the mechanical properties of an ECAP-processed magnesium alloy

Cited by 17 publications

References 14 publications

Free volumes in bulk nanocrystalline metals studied by the complementary techniques of positron annihilation and dilatometry

Free volumes in bulk nanocrystalline metals studied by the complementary techniques of positron annihilation and dilatometry

Eradication of Multi‐Drug Resistant Bacteria by a Novel Zn‐doped CuO Nanocomposite

Using differential scanning calorimetry as an analytical tool for ultrafine grained metals processed by severe plastic deformation

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