Werkstoffkunde

Bargel, Hans-Jürgen; Cardinal, Peter; Hilbrans, Hermann; Hübner, Karl-Heinz; Schulze, Günter; Wurzel, Georg

doi:10.1007/978-3-662-10904-5

Cited by 19 publications

(18 citation statements)

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“…It is well known, that thermal treatment of strained metals leads to relaxation of lattice defects and Ostwald ripening (increasing of crystallinity). [49] Nevertheless, as can be derived from Figure 8b and 8d, the surface of such an annealed electrode obviously contains enough poorly ordered gold atoms to promote the growth of individual crystals with defined faces. However, thermal treatment does not affect the electrochemical formation of these crystals, even though some are in dendritic shape and not as perfectly ordered as the ones generated on polished surfaces.…”

Section: Discussion: Interrelation Of Surface Morphology and Electrocsupporting

confidence: 91%

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

et al. 2017

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The voltammetric behavior of polycrystalline gold electrodes in 0.1 M sulfuric acid and the influence of prolonged repetitions of oxidation and reduction cycles at different scan rates on the surface morphology was studied. Slow (0.1 V s−1) as well as fast (1.0 V s−1) scan rates lead to an intense roughening of the electrode surface and the formation of a variety of different crystalline particles on it. These crystallites, their formation, and the influence of surface pretreatment were investigated with electrochemical methods, X‐ray diffraction measurements, and scanning electron microscopy. Additionally, an interpretation of the changing electrochemical signals of polycrystalline gold during prolonged potential cycling is given.

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Section: Discussion: Interrelation Of Surface Morphology and Electrocsupporting

confidence: 91%

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

et al. 2017

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“…The focus of this short work is to report on the microstructural details of an extruded EN AW-6060 alloy in order to determine the influence of various process [1]. The investigations are performed on a partly extruded block of aluminium EN-AW-6060.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of the microstructural evolution in aluminium alloys during extrusion

Kayser

Parvizian

Klusemann

et al. 2009

Computational Methods and Experiments in Materials Characterisation IV

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The purpose of this work is the investigation of the microstructural evolution in aluminium alloys during extrusion at high temperature and subsequent cooling. In particular, the alloy EN AW-6060 of the 6000 series (Al-Mg-Si) is examined here. Subject to such process conditions, the microstructural development in this high stacking-fault material is controlled mainly by dynamic recovery during extrusion and static recrystallisation during cooling. To characterize this development in more detail, EBSD measurements are carried out on different parts of a partly extruded specimen. From this sample, microstructural images are generated and a statistical analysis is performed. Our initial simulation results of the microstructural development during this process show good qualitative agreement with the trends found experimentally via the EBSD investigation.

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“…In combination with energy-dispersive x-ray spectroscopy measurements, it could be shown, that the aluminium content at the fusion line lies below a value of 20 at% aluminium, where the first intermetallic phases are built [17]. Furthermore, the silicon content of 14 %, which can be solved in a-iron, is not exceeded either [18]. Therefore, it can be stated that the precipitation consists of an iron, aluminium and silicon solid solution.…”

Section: Discussionmentioning

confidence: 99%

“…The first intermetallic aluminium-iron phase forms at aluminium concentrations of above 20 % [17]. And the same applies to silicon, as up to 14 % can be solved in an a-iron matrix [18].…”

Section: Weld Seam Indicationmentioning

confidence: 99%

Modified laser beam welding of aluminum‐silicon coated 22MnB5

Gerhards

Engels

Olschok

et al. 2019

Materialwissenschaft Werkst

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Press hardened 22MnB5 is an excellent structural material, but there are several issues when it comes to welding. Especially in the case of overlap joint laser welding, the most severe issue is precipitation of the aluminium silicon (AlSi) coating at the fusion line. If the coating remains on the sheets, an ultimate strength of 20 kN with a crack initiation at the fusion line is reached in tensile tests instead of 30 kN with a crack initiation in the heat affected zone (HAZ) when the coating is removed prior to welding. In the presented work, the influence of coating on the material properties as well as the structure of the precipitation at the fusion line are examined and discussed. It is stated that the precipitation does not consist of AlxFey intermetallic phases, but of an iron, aluminium and silicon solid solution. The fractured surfaces of tensile tests show brittle behavior for the precipitation and ductile behavior for areas where the crack propagated through the steel. A modified beam oscillation in the shape of a recumbent “8” in welding direction is introduced. It was possible to increase the ultimate strength by 10 kN and nearly double the possible elongation.

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Werkstoffkunde

Cited by 19 publications

References 0 publications

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

Experimental and theoretical investigation of the microstructural evolution in aluminium alloys during extrusion

Modified laser beam welding of aluminum‐silicon coated 22MnB5

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