Topic
Electron backscatter diffraction
About: Electron backscatter diffraction is a research topic. Over the lifetime, 15184 publications have been published within this topic receiving 317847 citations. The topic is also known as: EBSD.
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TL;DR: In this paper, the microstructure and phase constitution of the aluminide layers were characterized by means of optical microscope, scanning electron microscope with energy dispersive X-ray spectroscopy, Xray diffraction and electron backscatter diffraction, also the thicknesses of the intermetallic layers and the metal losses of the steel substrate were measured to investigate the interaction between mild steel and aluminum baths.
Abstract: Mild steel was coated by hot-dipping into molten pure aluminum, Al–0.5 Si, Al–2.5 Si, Al–5 Si and Al–10 Si (wt.%) baths at 700 °C for 180 seconds. The microstructure and phase constitution of the aluminide layers were characterized by means of optical microscope, scanning electron microscope with energy dispersive X-ray spectroscopy, X-ray diffraction and electron backscatter diffraction. Also, the thicknesses of the intermetallic layers and the metal losses of the steel substrate were measured to investigate the interaction between mild steel and aluminum baths. The results revealed that the additions of silicon to the aluminum baths caused Al7Fe2Si and Al2Fe3Si3 phases to form above the FeAl3 layer and in the Fe2Al5 layer, respectively. As the silicon content in the aluminum bath increased, the thickness of the intermetallic layer decreased, and the intermetallic layer/steel substrate interface transformed from an irregular morphology into a flat morphology. The decrease of the thickness of the intermetallic layer was principally attributed to the detachment of the Al7Fe2Si layer from the intermetallic layer into the aluminum bath. The flattened intermetallic layer/mild steel substrate interface was due to the formation of Al2Fe3Si3 precipitates in the Fe2Al5 layer by the serration-like steel substrate reacting with the Fe2Al5 layer containing solid-solute silicon.
99 citations
03 Jan 2015-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, tungsten particles were incorporated into an Al 5083 matrix by friction stir processing (FSP), which resulted in uniform dispersion of the tengsten particles with excellent interfacial bonding and more importantly without the formation of any harmful intermetallics.
Abstract: Tungsten particles were incorporated into an Al 5083 matrix by friction stir processing (FSP). FSP resulted in uniform dispersion of the tungsten particles with excellent interfacial bonding and more importantly without the formation of any harmful intermetallics. For the first time, the particles penetrated to a depth equal to the full pin length of the tool. A novel aspect of the 5083 Al–W composite is that it showed an improvement of more than 100 MPa in the UTS and at the same time exhibited a high ductility (30%). The ductility was also evident from the well defined dimples in the fracture surface which also revealed the superior bonding between the particles and the matrix. FSP also resulted in substantial grain refinement of the Al matrix. Electron backscatter diffraction (EBSD) and transmission electron microscopy analysis revealed that the fine grains formed by dynamic recrystallization. A gradual transformation from sub-grain to high-angle grain boundaries was observed from EBSD analysis pointing towards the occurrence of a continuous type of dynamic recrystallization process.
99 citations
TL;DR: By the sector microphotometer method of electron diffraction the molecular structure of hydrazine was obtained as shown in Table II as discussed by the authors, where the bond distances were in good agreement with the values obtained by the infrared vibration-rotation spectrum.
Abstract: By the sector-microphotometer method of electron diffraction the molecular structure of hydrazine was obtained as shown in Table II. The bond distances are in good agreement with the values obtained by the infrared vibration-rotation spectrum. The mean amplitudes agreed with the calculated values within the limits of errors.
99 citations
25 Mar 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the activation energy for the delta-processed superalloy 718 is determined to be 467 kJ/mol, which is inversely proportional to the Zener-Hollomon (Z) parameter.
Abstract: Flow stress behavior and microstructures during hot compression of delta-processed superalloy 718 at temperatures from 950 to 1100 °C with strain rates of 10−3 to 1 s−1 were investigated by optical microscopy (OM), electron backscatter diffraction (EBSD) technique and transmission electron microscopy (TEM). The relationship between the peak stress and the deformation conditions can be expressed by a hyperbolic-sine type equation. The activation energy for the delta-processed superalloy 718 is determined to be 467 kJ/mol. The change of the dominant deformation mechanisms leads to the decrease of stress exponent and the increase of activation energy with increasing temperature. The dynamically recrystallized grain size is inversely proportional to the Zener–Hollomon (Z) parameter. It is found that the dissolution rate of δ phases under hot deformation conditions is much faster than that under static conditions. Dislocation, vacancy and curvature play important roles in the dissolution of δ phases. The main nucleation mechanisms of dynamic recrystallization (DRX) for the delta-processed superalloy 718 include the bulging of original grain boundaries and the δ phase stimulated DRX nucleation, which is closely related to the dissolution behavior of δ phases under certain deformation conditions.
98 citations
TL;DR: In this article, a simple variant selection model is proposed in which martensite variants with habit planes nearly parallel to the primary and secondary slip planes nucleate preferentially on microband boundaries as a result of a smaller amount of activation energy and grow dominantly as a consequence of less inhibition from the micro band boundaries.
98 citations