Effects of Homogenization-Free on the Microstructures of an Al-Mg-Si-Cu Hot-Rolled Plate for Automotive Pannel

2018 ◽  
Vol 941 ◽  
pp. 1529-1534
Author(s):  
Ni Tian ◽  
Qi Long Liu ◽  
Zi Yan Zhao ◽  
Gang Zhao ◽  
Kun Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Rolling Direction ◽  
Rolled Plate ◽  
Alloy Plate ◽  
Solution Treated ◽  
Aluminum Alloy Plate ◽  
Hot Rolled ◽  
Scanning Electron

The microstructure of Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy plate hot-rolled from homogenization and homogenization-free ingots were investigated by optical microscopy and scanning electron microscopy assisted with energy dispersive spectroscopy (SEM/EDS). The results showed that there are 3 main kinds of constituents such as Mg2Si, AlCuMgSi and AlFeMnSi in the as-cast Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy ingot. After homogenization treated at 545°C for 24h, the black Mg2Si and the white bright AlCuMgSi particles in the ingot dissolved into matrix, but the grey AlFeMnSi phase partly dissolved, contracted into sphere and become coarse, many ultrafine dispersoids appear in the dendritic arms. The constituents in the plates hot-rolled from the homogenization and homogenization-free ingots are both distributed as broken chains along the rolling direction. However, compared with the particles configuration in the plate that hot-rolled from homogenization ingot, the particles in the plate that hot-rolled from the homogenization-free ingot are finer, more numerous and more homogenous, and with insufficient recrystallization when the plates are solution treated at 545°C for 2 h and then water quenched.

Process Study on Prepared Al2O3-TiB2 Composite Coating by Reactive Spray

2012 ◽  
Vol 472-475 ◽  
pp. 309-312
Author(s):  
Xiao Ping Zhou ◽  
Ming Li ◽  
Xin Zhou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Composite Coating ◽  
Milled Powder ◽  
X Ray ◽  
Phase Constituent ◽  
Process Study ◽  
High Microhardness ◽  
Scanning Electron

The microstructures and properties of Al2O3-TiB2 composite coating on the surface of the aluminum alloy by reactive spraying was studied. The influences of mechanical alloying and spraying temperature on the phase constituent and microstructure of the composite were analyzed by X-ray diffractometry(XRD) and scanning electron microscopy(SEM). The results indicate that Al2O3-TiB2 composite coating is obtained by plasma spraying using milled powder of Al，TiO2，B2O and B2O3. The coating possesses high microhardness of 1300 HV0.1.

Effect of Pre-Rolling Reduction on Intergranular Corrosion of Aluminum Alloy 2519A

2007 ◽  
Vol 546-549 ◽  
pp. 1117-1122 ◽  
Author(s):  
Y. Liu ◽  
Xin Ming Zhang ◽  
B. Liu ◽  
Hui Zhong Li ◽  
Hui Gao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Grain Boundaries ◽  
Intergranular Corrosion ◽  
Discrete Distribution ◽  
Rolling Reduction ◽  
Transmission Electron ◽  
Hardness Tests ◽  
Scanning Electron

The effect of pre-rolling reduction prior to ageing on the size and distribution of the precipitates, the width of precipitation free zones (PFZ) along grain boundaries and intergranular corrosion (IGC) of aluminum alloy 2519A were investigated by hardness tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results showed that the time for peak-age shortened when the reduction increased, which resulted in refining the precipitatates and distributing homogeneously within the grains and hence the IGC decreased. With increasing pre-rolling reduction, the PFZ along grain boundaries became narrower and precipitates changed from continuous chains to discrete distribution, which resulted in high IGC resistance.

scholarly journals Effect of sensitization on corrosion properties of TIG welded Al-Mg alloy

2020 ◽  
Vol 70 (1) ◽  
pp. 47-51
Author(s):  
Ljubica Radović ◽  
Jelena Marinković
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mass Loss ◽  
Grain Boundaries ◽  
Base Metal ◽  
Intergranular Corrosion ◽  
Corrosion Properties ◽  
Rich Phase ◽  
Hot Rolled ◽  
Scanning Electron

The effect of sensitization on the intergranular corrosion (IGC) of TIG welded AlMg6Mn was investigated by means of scanning electron microscopy (SEM) and corrosion NAMLT tests. The as-received hot rolled AlMg6Mn alloy plates with a thickness of 8 mm were welded by TIG welding with S-AlMg5 as a filler material. Specimens were sensitized at 100°C for 7 days. It was found that welded specimens are sensitive to IGC. The. mass loss in NAML test was 106.7 mg/cm². The welding increases the susceptibility to IGC, since the mass loss of the base metal at the same test was 70.7 mg/cm². The increase of susceptibility to IGC is attributed to significant continually precipitated Mg-rich phase along the grain boundaries during the sensitization treatment.

Effects of graphene on the microstructure and properties of MAO coatings formed on AA7050

2020 ◽  
Vol 111 (6) ◽  
pp. 463-468
Author(s):  
Bo Xu ◽  
Yafeng He ◽  
Xiangzhi Wang ◽  
Weimin Gan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Abstract Ceramic coatings were prepared on the surface of 7050 highstrength aluminum alloy using micro-arc oxidation in an aluminate electrolyte with added graphene. To analyze the surface morphology, roughness, phase composition, and corrosion resistance, scanning electron microscopy, X-ray diffraction, X-ray photoelectron, and electrochemical measurements were used, respectively. The addition of 9 g · L-1 of graphene to the electrolyte decreased the micro-pore size of the composite coatings and improved the density. In addition, with the addition of graphene, the roughness was the lowest, and the corrosion resistance was significantly improved.

Morphology of Surfaces Generated by Circular Wire Brushes

1995 ◽  
Vol 117 (1) ◽  
pp. 9-15 ◽  
Author(s):  
R. J. Stango ◽  
R. A. Fournelle ◽  
S. Chada
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Material Removal ◽  
Qualitative Theory ◽  
Characteristic Surface ◽  
Wire Brushing ◽  
Transfer Mechanisms ◽  
Scanning Electron ◽  
Subsurface Microstructure

The characteristic surface that is generated during orthogonal wire brushing of a flat 6061-T6 aluminum workpart is examined in this paper. Scanning electron microscopy is used for characterizing the surface topography, whereas subsurface microstructure and properties of the brushed region are evaluated by both metallography and microhardness measurements. The unique topographical characteristics of the contact zone suggest material removal and subsequent redeposition onto the workpart. On the basis of the experimental observations, a qualitative theory is advanced which identifies transfer mechanisms for removal and redeposition of aluminum alloy.

Study on the Mechanical Behavior of Aluminum Alloy 5083 Friction Stir Welded Joint

2014 ◽  
Author(s):  
A-H. I. Mourad ◽  
M. Allam ◽  
A. El Domiaty
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Optical Microscopy ◽  
Welded Joint ◽  
Friction Stir ◽  
Aluminum Alloy 5083 ◽  
Tool Pin ◽  
Scanning Electron

The mechanical behavior of friction stir welded joints made of aluminum alloy 5083-H111 was studied in this investigation. Different welding processes parameters (rotational speeds, travelling speeds and tool pin shapes) were used to investigate the effect of process parameters on the strength and fracture properties of the joint. Scanning electron microscopy and optical microscopy analysis were conducted to study the effect of friction stir welding FSW process on the grain size in the welding zones. In general, the results illustrated that tool profile, the rotation speed and the traveling speed has great effect on the strength of the welded joint. Scanning electron microscopy and optical microscopy investigations showed that the grains inside the welding zone was refined and equiaxed resulting in higher hardness inside the nugget.

The Regularities of Copper-Aluminum System Polymetallic Samples Manufacturing by the Additive Electron-Beam Technology

2020 ◽  
Vol 992 ◽  
pp. 517-522
Author(s):  
K.N. Kalashnikov ◽  
Kseniya S. Osipovich ◽  
T.A. Kalashnikova
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Electron Beam ◽  
Defect Formation ◽  
Boundary Zone ◽  
Copper Aluminum ◽  
Printing Parameters ◽  
Amg5 Aluminum Alloy ◽  
Scanning Electron

The structure and composition of polymetallic materials samples obtained by electron-beam manufacturing from AMg5 aluminum alloy and M1 grade copper were investigated by optical and scanning electron microscopy. Mechanisms of defect formation in the structure of samples at different 3D printing parameters are determined. The features of gradient structures formation in the boundary zone at successive deposition of aluminum alloy and copper layers are investigated.

scholarly journals Drawing-Induced Evolution of Inclusions in Cold-Drawn Pearlitic Steel

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1272
Author(s):  
Jesús Toribio ◽  
Francisco-Javier Ayaso ◽  
Rocío Rodríguez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Image Analysis ◽  
Visual Inspection ◽  
Cold Drawing ◽  
Pearlitic Steel ◽  
Drawing Process ◽  
Analysis Program ◽  
Hot Rolled ◽  
Scanning Electron

This article focuses on the analysis of the evolution of inclusions present in eutectoid pearlitic steel subjected to a real cold drawing process. To this end, wires belonging to different stages of the manufacture chain were studied, starting from an initial hot rolled bar (not cold drawn at all). In addition to the information obtained through visual inspection, a quantitative analysis of the microdefects generated by these inclusions was carried out. The analysis was performed using materialographic techniques, scanning electron microscopy (SEM) and the image analysis program (AnaliSYS 3.1®).

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