An Investigation on the Impurities of Aluminum Alloy in Melt Furnace

2010 ◽  
Vol 97-101 ◽  
pp. 1045-1048
Author(s):  
Zheng Bin Xu ◽  
Yong Zhi Zou ◽  
Wen Chao Wang ◽  
Xing Zhi Pang ◽  
Jian Min Zeng
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Elemental Carbon ◽  
Energy Dispersive Spectrometer ◽  
Furnace Wall ◽  
Sio2 Particle ◽  
A357 Alloy ◽  
Unknown Phase ◽  
Scanning Electron

The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize samples prepared from the surface scum of melt, the middle flake residues on the furnace wall and the “bottom bulk” after the A357 alloy pouring. The morphology and impurities composition of these features were investigated. Some of particles and regions in samples during the analyses were also studied in detail. The results of analyses show that the surface scum of melt include Al2O3, MgO or MgAl2O4; the impurities of the middle flake residues is comprised of Al2O3, MgO or MgAl2O4, as well as SiO2 particle, Al9Fe2Si2 compound and dimple like C-rich areas; the bottom bulk contains C-rich impurities such as Al4C3 or some of unknown phase or elemental carbon.

Study on the Formation of Nanometer Silver Sol by Micro Arc Discharge

2014 ◽  
Vol 490-491 ◽  
pp. 8-13
Author(s):  
Jing Yang ◽  
Zhi Yu Yan ◽  
Bing Sun ◽  
Qiao Min Wang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electrolyte Solution ◽  
Sodium Citrate ◽  
Preparation Method ◽  
Arc Discharge ◽  
Energy Dispersive Spectrometer ◽  
Original Size ◽  
Stabilizer Type ◽  
Scanning Electron

A preparation of nanometer silver sol by micro arc discharge has been study here through the reduction of Ag3PO4. Sodium citrate and polyvinylpyrrolidone were added respectively into the electrolyte as stabilizer. The results show that, the Ag3PO4 concentration, stabilizer type and concentration have great impacts on the formation of the nanometer silver sol. By means of UV-VIS extinction spectrophotometer, scanning electron microscope and energy dispersive spectrometer, it is found that the solid powder extracted from the electrolyte solution after discharge is the aggregation of the silver formed in the solution and their original size maybe less than 20nm. Nanometer silver with smaller size and narrower size distribution can be obtained with sodium citrate as stabilizer than with polyvinylpyrrolidone. But the latter has higher conversion rate. From this experiment, we found that micro arc discharge can be a rapid, stable preparation method of nanometer silver sol.

scholarly journals Calorimetric study on Bi-Cu-Sn alloys

2019 ◽  
Vol 38 (2019) ◽  
pp. 541-546
Author(s):  
Jolanta Romanowska
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Temperature Interval ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Calorimetric Study ◽  
Calorimetric Investigation ◽  
Scanning Calorimetry ◽  
Scanning Electron

AbstractThe paper presents results of calorimetric investigation of the Bi-Cu-Sn system by means of differential scanning calorimetry (DSC) at the temperature interval 25-1250∘C, Values of liquidus, solidus and invariant reactions temperatures, as well as melting enthalpies of the selected alloys were determined. Microstructure investigation of the alloys were performed by the use of a scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS).

scholarly journals Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5262
Author(s):  
Liping Wu ◽  
Jianguo Zhi ◽  
Jiangshan Zhang ◽  
Bo Zhao ◽  
Qing Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Heterogeneous Nucleation ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Vessel Steel ◽  
Cryogenic Vessel ◽  
Central Segregation ◽  
Scanning Electron

The effects of Cerium (Ce) were studied on the casting slab quality, microstructure, and inclusion evolution of cryogenic vessel steel. An optical metallographic microscope, scanning electron microscope, energy dispersive spectrometer, and Thermo-calc thermodynamic software were used for characterization and analysis. The results indicated that the central segregation was significantly improved after adding Ce and reached the lowest level when the content of Ce was 0.0009 wt.%. Meanwhile, the presence of Ce reduces the size of ferrite and improves pearlite morphology. Ce also enables the modification of Al2O3 and MnS + Ti4C2S2 inclusions into ellipsoid CeAlO3 and spherical Ce2O2S + Ti4C2S2 composite inclusions, respectively, which are easier to remove. The formed Ce2O2S inclusions are fine and can work as heterogeneous nucleation points to refine the microstructure of steel.

The Surface Deformation of Aluminum Compressed With Viscous Lubricants

1974 ◽  
Vol 96 (4) ◽  
pp. 591-594 ◽  
Author(s):  
D. D. Ratnagar ◽  
H. S. Cheng ◽  
J. A. Schey
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Finish ◽  
Surface Deformation ◽  
Surface Roughening ◽  
6061 Aluminum Alloy ◽  
Clear Delineation ◽  
Lubricant Viscosity ◽  
Scanning Electron

The influences of lubricant viscosity and loading velocity on the surface finish of plastically compressed 6061 aluminum alloy cylinders were studied. Specimens with polished end faces were subjected to compression between two flat, chromium plated dies, with lubricants of a viscosity ranging from 42 cp to 1207 cp at 38 deg C. The deformed surfaces were studied under a scanning electron microscope and by stylus tracings and CLA readings. With the lighter lubricants surface roughening resulted from preferential yielding leading to a clear delineation of grain boundaries and slip lines. With the heavier lubricants, localized “hydrodynamic pockets” formed in addition to the above features. The depth of pockets increased with viscosity and/or velocity.

STUDI EKSPERIMENTAL PENGENDALIAN LAJU KOROSI FATIK PADA ALUMINIUM 2024-T3 DI LINGKUNGAN AIR LAUT MELALUI PENAMBAHAN INHIBITOR KALIUM KROMAT (K2CrO4)

2017 ◽  
Author(s):  
Waris Wibowo
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Corrosion Rate ◽  
Scanning Electron Microscope ◽  
Sea Water ◽  
Good Mechanical Property ◽  
Aluminum Alloy 2024 ◽  
Fatigue Corrosion ◽  
Al 2024 ◽  
Scanning Electron

<p>Aluminum alloy 2024-T3 is widely used in manufacturing industries such as aircraft, automotive and ship industries due to its character as a good mechanical property. Aluminum alloy2024-T3, however, is easily suffered from corrosion attack when it is applied in corrosive environment such as sea water. One of the corrosion rate control methods is by applying inhibitor addition. This research aims to study the effect of K2CrO4 inhibitor in controlling the rate of corrosion of Al 2024-T3 in sea water. In this research, K2CrO4 was added to sea water environment with various concentrations of 0.1 %, 0.3% and 0.5%. Subsequently the corrosion rates were measured using a-three-electrode potential technique with saturated calomel (Hg2Cl2) as a referenced electrode whereas the auxiliary electrode was platinum (PT). Fatigue corrosion experiments was done using servo hydraulic testing engine, sinusoidal load was chosen with the stress ratio of R= Smin/Smaks = 0,1, and the frequence of 15 Hz, the voltage level used was 20%. Composition analyses, micro structure examination with Scanning Electron Microscope (SEM) were also done to get the supporting data. The results show that fatigue corrosion rate of aluminum alloy 2024-T3 with the additions of K2CrO4 inhibitor in the sea water tends to reduce at the optimum concentration of 0.5% of K2CrO4. It is indicated by the reduction of fatigue corrosion rate as amount of 32.13%. This inhibitor may hamper the rate of fatigue corrosion by oxidation so that it produces a compound (passive film) which covers the surface of Aluminum alloy 2024-T3 which is in turn it will reduce the attack of corrosion.</p><p><strong>Keywords : Aluminum Alloy 2024-T3, Fatigue Corrosion, K2CrO4 Inhibitor</strong></p><p><br /> ABSTRAK<br /> Aluminium paduan seri 2024-T3 telah banyak diaplikasikan pada industri pesawat terbang, otomotif, dan kapal laut karena memiliki sifat mekanik yang baik. Namun demikian aluminium paduan 2024- T3 rentan terhadap korosi bila diaplikasikan di lingkungan yang korosif seperti air laut. Salah satu upaya untuk mengendalikan laju korosi adalah dengan penambahan inhibitor. Penelitian ini bertujuan untuk mempelajari pengaruh inhibitor kalium kromat (K2CrO4) dalam mengendalikan laju korosi Al 2024-T3 di lingkungan air laut. Pada penelitian ini, jenis inhibitor yang dipakai adalah kalium kromat (K2CrO4) yang ditambahkan di media air laut dengan variasi konsentrasi 0,1%; 0,3%; dan 0,5%. Selanjutnya laju korosi diukur dengan menggunakan metode sel potensial tiga elektroda yang menggunakan kalomel jenuh (Hg2Cl2) sebagai elektroda baku sedangkan elektroda tambahan digunakan platina. Pengujian korosi fatik dengan mesin uji servohidraulik, beban sinusoidal dipilih rasio tegangan R= Smin/Smaks = 0,1 dan frekuensi 15 Hz, level tegangan yang digunakan adalah 20%. Sebagai data pendukung dilakukan uji komposisi dan uji struktur mikro dengan Scanning Electron Microscope (SEM). Hasil penelitian ini memperlihatkan bahwa laju korosi fatik Al 2024-T3 dengan penambahan inhibitor kalium kromat (K2CrO4) di media air laut cenderung menurun pada konsentrasi optimum 0,5% K2CrO4, ditandai dengan penurunan laju korosi fatik sebesar 32,13%. Inhibitor ini dapat menghambat laju korosi fatik dengan cara mengoksidasi sehingga menghasilkan produk senyawa (lapisan pasif) yang dapat menutup permukaan Al 2024-T3 yang dapat mengurangi serangan korosi.</p><p><strong>Kata kunci : Aluminium Paduan 2024-T3, Korosi Fatik , Inhibitor K2CrO4</strong></p><p> </p>

Preparation of Magnetic Abrasive by Sintering Method

2010 ◽  
Vol 135 ◽  
pp. 382-387
Author(s):  
Zeng Dian Zhao ◽  
Yu Hong Huang ◽  
Yu Gang Zhao
Keyword(s):  
Surface Roughness ◽  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectrometer ◽  
Performance Testing ◽  
Ferromagnetic Phase ◽  
Durability Analysis ◽  
Sintering Method ◽  
Scanning Electron

In this paper, ferrosilicon powder was used as the ferromagnetic phase, corundum powder as the abrasive phase, high temperature inorganic binder as the adhesive, and after the ferrosilicon powder was modified, a series of magnetic abrasive was obtained by sintering method. Scanning electron microscope (SEM) and Energy dispersive spectrometer (EDS) were respectively used to characterize the morphology and elemental composition of magnetic abrasive. and through experiments carried out on the magnetic abrasive grinding performance testing and durability analysis. The experimental results showed that the magnetic abrasive prepared had good polishing ability and longer using time, and the surface roughness of the grinding sample can reach 0.12μm and the using time is up to 25 min.

Effects of Microporosity on the Tensile Properties of Aluminum Alloy

2011 ◽  
Vol 422 ◽  
pp. 627-631 ◽  
Author(s):  
Xie Hua Li ◽  
Li Zi He ◽  
Yi Heng Cao ◽  
Pei Zhu ◽  
Ya Ping Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hydrogen Content ◽  
Optical Microscope ◽  
Slip Step ◽  
Inclusion Content ◽  
1050 Aluminum Alloy ◽  
Scanning Electron

The influences of cooling rate, hydrogen inflating time, degassing time, inclusion content on the distribution of pores within the ingot , hydrogen content and the mechanical properties of 1050 aluminum alloy were investigated by tensile test, optical microscope(OM), scanning electron microscope(SEM). With the increasing inflating hydrogen time, the hydrogen content increases, while, the strengths and elongation decrease. With the increasing degassing time, the hydrogen content decreases, while, the strengths and the elongation increase. With increasing cast temperature, the hydrogen content remains constant at first and increases obviously from 7200C to 7600C, while the strengths and the elongation decrease gradually. The crack is mainly originated at outcrop of slip step, inclusion and porosity.

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