scholarly journals Microstructure of Mg–Al–RE-type Experimental Magnesium Alloy Gravity Cast into Sand Mould

2016 ◽  
Vol 16 (2) ◽  
pp. 115-118 ◽  
Author(s):  
K.N. Braszczyńska-Malik ◽  
E. Przełożyńska
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Equilibrium Solidification ◽  
Alloy Microstructure ◽  
Sand Mould ◽  
Cast Condition ◽  
Gravity Cast ◽  
Scanning Electron

Abstract Magnesium alloy with 5 wt% Al, 0.35 wt% Mn and 5 wt% rare earth elements (RE) was prepared and gravity cast into a sand mould. Microstructure investigations were conducted. Analyses of the Mg-Al-RE alloy microstructure were carried out by light microscopy, scanning electron microscopy and the XRD technique. In the as-cast condition, the alloy was composed of α-Mg, Al11RE3 and Al10RE2Mn7 intermetallic phases. Additionally, due to non-equilibrium solidification conditions, an Al2RE intermetallic phase was revealed.

The Microstructure of AlSi7Mg Alloy in as Cast Condition

2015 ◽  
Vol 229 ◽  
pp. 3-10 ◽  
Author(s):  
Bartłomiej Dybowski ◽  
Bogusława Adamczyk-Cieślak ◽  
Kinga Rodak ◽  
Iwona Bednarczyk ◽  
Andrzej Kiełbus ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Chemical Composition ◽  
Energy Dispersive Spectrometry ◽  
Intermetallic Phases ◽  
Transmission Electron ◽  
Alloy Microstructure ◽  
Cast Condition ◽  
Scanning Electron

The complex microstructure of as-cast AlSi7Mg alloy has been investigated. Microstructure observations were done using light microscopy, scanning electron microscopy and transmission electron microscopy. Chemical composition of the microstructure constituents was investigated by means of energy dispersive spectrometry, conducted both during SEM and STEM investigations. Selected area diffraction was used to identify the phases in the alloy. Microstructure of the alloy in the as-cast condition consists of Al-Si eutectic and intermetallic phases in the interdendritic regions. These are: Mg2Si, α-AlFeMnS, β-AlFeSi and π-AlFeSiMg phases. What is more, number of fine precipitates were found within the α-Al dendrites. Only the occurrence of U1 (MgAl2Si2) phase has been confirmed.

Detection of Intermetallic Compounds in a Mg-5Al-3Ca-0.7Sr-0.2Mn Magnesium Alloy

2013 ◽  
Vol 197 ◽  
pp. 137-142 ◽  
Author(s):  
Tomasz Rzychoń ◽  
Janusz Szala ◽  
Tomasz Kukiełka
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloy ◽  
Light Microscopy ◽  
Diffraction Analysis ◽  
Intermetallic Compounds ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this paper the results of microstructural investigations and methodology of detection of intermetallic compounds were reported. The microstructural investigations included the light microscopy, scanning electron microscopy, chemical microanalysis and X-ray diffraction analysis. It was found that the microstructure of Mg-5Al-3Ca-0.7Sr-0.2Mn alloy consists of α-Mg, (Mg,Al)2Ca, Al3Mg13(Sr,Ca), Mg2Ca and Al2Ca intermetallic phases. The correct detection of these phases requires the high magnifications and a large number of measurements fields.

Investigation of the Role of Intermetallic Phases in Microstructure of UFG Titanium VT8M-1 Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1659-1663
Author(s):  
Tatyana Vitalyevna Yakovleva ◽  
Grigory Dyakonov ◽  
Andrey Stotskiy ◽  
Iuliia Mikhailovna Modina ◽  
Irina Semenova
Keyword(s):  
Intermetallic Phases ◽  
High Temperature Strength ◽  
Electronic Microscopy ◽  
Two Phase ◽  
Rotary Swaging ◽  
Operation Temperature ◽  
Ultrafine Grained ◽  
Alloy Microstructure ◽  
Scanning Electron

The paper studies the microstructure of two-phase ultrafine-grained titanium VT8M-1 alloy (Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn), which was obtained by rotary swaging (RS). Parameters of the microstructure and the change of the phase elemental / chemical composition were investigated by scanning electron microscopy and transmission electronic microscopy. It was shown that the silicide particles like S2 - (Ti,Zr)6Si3 were precipitated in the process of rotary swaging. The influence of silicide precipitations on the characteristics of high temperature strength of the ultrafine-grained two-phase titanium VT8M-1 alloy was discussed in the paper. The alloy microstructure was analyzed after the creep-rupture tests in the operation temperature range 300-400oС.

scholarly journals Formation and Evolution of Inclusions with Different Adding Order of Magnesium and Sulfur in Al-Killed Free-Cutting Steel

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1064 ◽  
Author(s):  
Yi Min ◽  
Qingsong Zhang ◽  
Haisheng Xu ◽  
Jiujian Xu ◽  
Chengjun Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Liquid Steel ◽  
Saturated Liquid ◽  
Cutting Steel ◽  
Sulfur Addition ◽  
Equilibrium Solidification ◽  
Formation And Evolution ◽  
Scanning Electron ◽  
Magnesium Addition

To reveal the effect of adding order of magnesium and sulfur on the evolution of inclusions in Al-killed free-cutting steel, both deoxidized experiments and thermodynamic calculations were carried out in this paper. The samples, which were extracted from the liquid steel at different time after magnesium and sulfur addition, were analyzed by scanning electron microscopy and energy dispersive spectroscopy. The results showed that the adding order had a significant influence on the formation and evolution of inclusions. In the case of magnesium added before sulfur, MgO formed immediately after magnesium addition and then transformed to spinel accompanied by MeS (Mg0.9Mn0.1S) after sulfur addition. In the case of sulfur added prior to magnesium, MgO and MeS precipitated simultaneously after magnesium addition. During the equilibrium solidification, the transformation of MgO to spinel was calculated to take place before MnS precipitated from the saturated liquid steel.

Influence of Si Content on Tensile Properties and Fractography of Al–Mg–Si Ternary Alloys

2021 ◽  
Vol 21 (3) ◽  
pp. 2005-2009
Author(s):  
Shah Abdul Wahid ◽  
Seong-Ho Ha ◽  
Bong-Hwan Kim ◽  
Young-Ok Yoon ◽  
Hyun-Kyu Lim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Scanning Electron Microscopy ◽  
Yield Strength ◽  
Tensile Properties ◽  
Ternary Alloys ◽  
Si Content ◽  
Cast Condition ◽  
Iron Bearing ◽  
Scanning Electron

This study investigated the heat treatment response and tensile properties of Al–6 mass%Mg–xSi (x = 1, 3, 5, and 7 mass%) ternary alloys. Further, the fracture behavior of these alloys in response to heat treatment for different temper conditions was also examined. Scanning electron microscopy–energy dispersive X-ray spectrometry (SEM–EDS) analysis of the as-cast alloys revealed, in all of them, the presence of iron-bearing phases (in a size range of 10˜60 μm) that did not dissolve or become refined upon heat treatment. Additionally, eutectic Mg2Si and Al3Mg2 phases were found in Alloy I (Al–6Mg–1Si), while eutectic Mg2Si and Si phases were found in the rest of the alloys. In the as-cast condition, the tensile properties of the examined alloys decreased in relation to increasing Si content. Nonetheless, after heat treatment, the yield strength of the alloys with high Si content (>3 mass%) increased significantly compared with that in the as-cast condition. A yield strength greater than 300 MPa was achieved in both Alloy III (Al–6Mg–5Si) and Alloy IV (Al–6Mg–7Si), although this was achieved at the expense of ductility. According to the fractography of the tensile-fractured surfaces undertaken using optical and scanning electron microscopy, fractures of the iron-bearing phases were found to be the source of cracking in alloys with high Si content. In the case of those with low Si content (≤3 mass%), cracks were believed to have been caused by the debonding of iron-bearing phases from the aluminum matrix.

Analysis of Morphology and Growth Kinetics of Zn-Mn and Zn-0.2wt.%Al-Mn Hot-Dip Galvanizing Coatings

2011 ◽  
Vol 291-294 ◽  
pp. 233-236
Author(s):  
Jian Hua Wang ◽  
Zi Shi Wu ◽  
Xu Ping Su ◽  
Chang Jun Wu ◽  
Ya Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Growth Kinetics ◽  
Immersion Time ◽  
Intermetallic Phase ◽  
Phase Changes ◽  
Zinc Bath ◽  
Phase Layer ◽  
Δ Phase ◽  
Kinetics Of ◽  
Scanning Electron

The influence of manganese in Zn-Mn and Zn-0.2wt.%Al-Mn bath on the morphology and growth kinetics of the galvanizing coatings has been studied using scanning electron microscopy equipped with energy dispersive spectroscopy. When galvanized in zinc bath, the coating consists mainly h and ζphase. When manganese is added in zinc bath, the morphology of ζ phase changes from fragmental to compact. Manganese favors the formation of the δ phase and inhibits the growth of the ζ phase.When galvanized in Zn-0.2wt.%Al bath, the coating consists only δ and h phase. With the addition of manganese in Zn-0.2wt.%Al bath, the morphology of δ phase changes from fragmental to compact The thickness of the Fe-Zn intermetallic phase layer in coatings decreases obviously when manganese is added into zinc and Zn-0.2wt.%Al bath, and the thickness increases slowly with the increase of immersion time.

scholarly journals Microstructure and Mechanical Properties of Joints of Titanium with Stainless Steel Performed using Nickel Filler

2016 ◽  
Vol 61 (2) ◽  
pp. 997-1001 ◽  
Author(s):  
B. Szwed ◽  
M. Konieczny
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Stainless Steel ◽  
Shear Strength ◽  
Intermetallic Phases ◽  
X Ray ◽  
Diffusion Brazing ◽  
Titanium Grade ◽  
Scanning Electron

AbstractDiffusion brazing was performed between titanium (Grade 2) and stainless steel (X5CrNi18-10) using as a filler a nickel foil at the temperatures of 850, 900, 950 and 1000°C. The microstructure was investigated using light microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS). The structure of the joints on the titanium side was composed of the eutectoid mixture αTi+Ti2Ni and layers of intermetallic phases Ti2Ni, TiNi and TiNi3. The stainless steel-nickel interface is free from any reaction layer at 850°C, above this temperature thin layer of reaction appears. The microhardness measured across the joints reaches higher values than for titanium and stainless steel, and it achieves value from 260 to 446 HV. The highest shear strength (214 MPa) was achieved for joints brazed at 900°C.

Investigation of Intermetallic Phase Formation and Structural Analysis in Annealed Al/Cu Bilayer Thin Films

2013 ◽  
Vol 845 ◽  
pp. 221-225
Author(s):  
Zulhelmi Alif Abdul Halim ◽  
Muhammad Azizi Mat Yajid ◽  
Zulkifli Mohd Rosli ◽  
Riyaz Ahmad Mohamad Ali
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Structural Analysis ◽  
Annealing Temperature ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
X Ray ◽  
Transmission Electron

The growth of intermetallic phases in Al/Cu bilayers thin film having 2/3 layer thickness ratios were characterized by X-ray powder diffraction (XRD), energy dispersive X-ray (EDX) and transmission electron microscopy (TEM). In annealing temperature of 200 °C, the growth is controlled by Cu diffusion which resulted to formation of θ-Al2Cu, η-AlCu, ζ-Al3Cu4 and γ-Al4Cu9 phase.

scholarly journals Microstructure Analysis of Magnesium Alloy Electrodes in Seawater Batteries

2021 ◽  
Vol 18 (2) ◽  
pp. 242-248
Author(s):  
Rezza Ruzuqi ◽  
Victor Danny Waas ◽  
Muhammad Ali Ulath
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
Magnesium Alloy ◽  
Microstructural Analysis ◽  
Fine Powder ◽  
Test Material ◽  
Accurate Information ◽  
Scanning Electron

Microstructural analysis has been performed on magnesium alloy electrodes, the material used for saltwater lantern batteries. This research aims to obtain detailed and accurate information needed to support the analysis of magnesium alloy corrosion resistance caused by the electrolysis process using various analytical methods in SEM(Scanning Electron Microscopy). It is a tool that uses an electron beam to display the surface structure and composition of a test material. The test carried out on this magnesium alloy electrode is to crush the electrode into a fine powder. Then the powder is put into a container for SEM-EDS testing. Magnifications start from 1,000xuntil 15,000x. The results showed that the greater the magnification on the microscope, the more it was seen that the lumps looked brittle. Then on the surface of the magnesium alloy electrodes, 58.00 wt% magnesium material is contained.

Application of a Ternary Zn-Based Solder Alloy for Joining of AZ31B Magnesium Alloy with Ultrasonic Support

2014 ◽  
Vol 1077 ◽  
pp. 82-88
Author(s):  
Miroslav Jáňa ◽  
Milan Turňa ◽  
Milan Marônek ◽  
Marcel Kuruc ◽  
Pavel Bílek
Keyword(s):  
Solid Solution ◽  
Magnesium Alloy ◽  
Melting Temperature ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Metallurgical Process ◽  
Dsc Analysis ◽  
Ultrasonic Soldering ◽  
Soldered Joint ◽  
Ternary Structure

Contribution deals with soldering of Mg alloy AZ31B by ternary solder ZnAl6Ag6 with ultrasonic support. Suggested solder has been analyzed from many aspects. Microstructure of solder consistutes of solid solution α-Al (FCC_Al), β-Zn (HCP_Zn) and intermetallic phases AgZn3 and AlAg3. Melting temperature of solder 386.8 °C has been determined by DSC analysis. Metallurgical process of ultrasonic soldering has run at 410 °C for 3 s. Soldered joint has been constituted by eutectic ternary structure β-Mg17(ZnAl)12, solid solution α - Mg, which contains Al and Ag elements. At solder-substrate interface, there has been formed intermetallic phase Mg2Zn11. The highest value of microhardness has been 260 HV. To predict lifetime of soldered joint, calculations in software Thermo-Calc has been performed.

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