Non-Metallic Inclusions in Mg-RE-Zr Casting Alloys

2014 ◽  
Vol 782 ◽  
pp. 398-403
Author(s):  
Bartłomiej Dybowski ◽  
Andrzej Kiełbus
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Liquid Metal ◽  
Magnesium Alloys ◽  
Gating System ◽  
Mould Material ◽  
Casting Alloys ◽  
Metallic Inclusions ◽  
Liquid Metal Surface ◽  
Scanning Electron

Non-metallic inclusions in Elektron 21 and WE43 magnesium alloys have been investigated by means of scanning electron microscopy. Investigations were conducted both on the fracture surfaces and microsections. Researches revealed presence of alloying elements oxides, inclusions originating in mould material and inclusions originating in the fluxes covering liquid metal surface in the cruicible. The number of inclusions is reduced by application of complex gating system and by leaving small amount of alloy in the cruicible after the pouring process.

Deposition of Polypyrrole Onto a Novel Polymer Electrode for Use in a Biomimetic Artificial Excitable Cell Membrane

2010 ◽  
Author(s):  
Christina V. Haden ◽  
Donald A. Jordan ◽  
Pamela M. Norris
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Membrane ◽  
Surface Morphology ◽  
Polymer Membrane ◽  
Electroactive Polymer ◽  
Gating System ◽  
Excitable Cell ◽  
Semi Solid ◽  
Scanning Electron

A novel and inexpensive bucky gel electrode has been investigated for use as the electrode substrate for deposition of polypyrrole. The electroactive polymer membrane was successfully deposited and the surface morphology studied using scanning electron microscopy. Given the properties of the bucky gel electrode and its ability to conduct ions, this work establishes the first step towards a semi-solid ion-gating system to be used in further applications.

Deposition of Polypyrrole Onto Bucky Gel for Use in a Biomimetic Artificial Excitable Cell Membrane

2011 ◽  
Vol 2 (3) ◽  
Author(s):  
Christina V. Haden ◽  
Donald A. Jordan ◽  
Pamela M. Norris
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Membrane ◽  
Surface Morphology ◽  
Electrochemical Cell ◽  
Saturated Calomel Electrode ◽  
Gating System ◽  
Excitable Cell ◽  
Potentiostatic Deposition ◽  
Scanning Electron

A novel and inexpensive bucky gel electrode was investigated for use as the electrode substrate for polypyrrole deposition. Potentiostatic deposition of polypyrrole onto gold and bucky gel electrodes was carried out at +1.2 V versus saturated calomel electrode for 1 h in a standard three-electrode electrochemical cell. The electroactive polypyrrole membrane was successfully deposited onto bucky gel, and its surface morphology studied using scanning electron microscopy. Given the bucky gel’s dual ability to both conduct electricity and ions, this work establishes the first step toward a semisolid ion-gating system to be used in further applications.

Effect of Li on Corrosion Resistance of Nearly Eutectic Al-Si Casting Alloys

2013 ◽  
Vol 364 ◽  
pp. 573-576
Author(s):  
Yuan Xing Cai ◽  
Zhong Kui Zhao ◽  
Zhi Gang Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Energy Dispersive Spectrometer ◽  
Lithium Content ◽  
Corrosion Performance ◽  
Surface Appearance ◽  
Tafel Polarization ◽  
Casting Alloys ◽  
Scanning Electron

Lithium was added into ZAlSi12 casting alloys to produce Al-Si-Li alloys containing 0%Li, 1%Li, 2%Li and 3%Li respectively. The corrosion performance of the alloys containing various content of lithium was tested by the Tafel polarization curves and the alloys were dipped thoroughly into the solution of 5% NaCl. The surface appearance of the alloys after corrosion was observed by Scanning Electron Microscopy, the composition of corrosion products was determined by Energy Dispersive Spectrometer. The results show that the corrosion resistance of ZAlSi12 casting alloys is improved by the addition of lithium. The alloy has an optimum corrosion resistance when the lithium content is 2%, and then the corrosion resistance decreases as increment of lithium content.

Evaluation of Wear and Corrosion Resistances of Oxide Coatings Formed on Magnesium Alloys by Micro Arc Oxidation

2017 ◽  
Vol 263 ◽  
pp. 125-130
Author(s):  
Mustafa Tekin ◽  
Cengizhan Taslicay ◽  
Faiz Muhaffel ◽  
Huseyin Cimenoglu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloys ◽  
Oxide Coatings ◽  
X Ray ◽  
Wear And Corrosion ◽  
Coating Morphology ◽  
Micro Arc Oxidation ◽  
Wear Tests ◽  
Scanning Electron

In the present study, wear and corrosion resistances of magnesium alloys were analyzed after coated by micro arc oxidation (MAO) process for potential protection of gear component, which is the most wearing part of a conventional bicycle. Two of the most common magnesium alloys (AZ31 and AZ91) were used in the study and they were oxidized in three different electrolytes (aluminate-, silicate-and phosphate-based). Scanning electron microscopy (SEM) was utilized in order to analyze the coating morphology and wear tracks obtained during wear tests. Energy dispersive X-ray spectroscopy (EDS) analyses were implemented to determine the elemental composition of the coatings. Wear and corrosion tests were applied to compare the performances of the coatings. Experimental results showed that wear and corrosion resistances of the samples generally increased after coated by MAO process and the best protection against wear and corrosion related failures, was achieved by utilizing silicate-based electrolyte for MAO process of magnesium alloys under selected process parameters.

Phase Analysis of Al-Mn Compounds in the AZ Magnesium Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 395-398 ◽  
Author(s):  
Chuan Pu Liu ◽  
Fu Sheng Pan ◽  
Wei Qing Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloys ◽  
Leaf Shape ◽  
Extrusion Process ◽  
X Ray Diffraction ◽  
Extraction Technology ◽  
X Ray ◽  
Structure And Morphology ◽  
Scanning Electron

The powders of Al-Mn phases were obtained from the as-cast, as-rolled and as-extruded AZ magnesium alloys (AZ31, AZ61) by using the extraction technology, which was found to be one of the effective methods for analyzing Al-Mn phases in the AZ magnesium alloys. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion X-ray detector (EDX) were used to investigate the structure and morphology of these compound powders. The results showed that manganese existed in both the way of Al8Mn5 phases and dissociated manganese particles in the AZ magnesium alloys, and rolling or extrusion process did not change the type of the Al8Mn5 phases. SEM observation showed that Al8Mn5 phases were formed mainly in dendrite and leaf shape with the size of 15-100μm in the as-cast AZ magnesium alloys, and were broken into fine spherical fragments with the size of about 4-5μm after rolling or extrusion.

Effects of Yttrium Addition on Microstructure and Mechanical Properties of AZ80–2Sn Magnesium Alloys

2015 ◽  
Vol 34 (8) ◽  
Author(s):  
Hansong Xue ◽  
Gang Yang ◽  
Di Li ◽  
Zhihui Xing ◽  
Fusheng Pan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition ◽  
Scanning Electron ◽  
Cast Microstructure

AbstractThe effects of Y on microstructure and mechanical properties of as-cast AZ80–2Sn magnesium alloys were investigated by optical microscopy, scanning electron microscopy and X-ray diffraction. Y addition not only changes the as-cast microstructure but also influences the mechanical properties of AZ80–2Sn alloy. Unmodified AZ80–2Sn alloys under casting state show that Mg

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