EBSDElectron Backscatter Diffraction
EBSDEast Brunswick School District (New Jersey)
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Metallurgical Analysis The metallurgical analysis of FSW welded joint is studied by an optical microscope and EBSD technique.
From EBSD measurements, the crystal direction of the [Al.sub.2][O.sub.3] phase for the 1 mm/min sample was found to be <001> along the growth direction, which was inherited from the seed direction, but those of the YAG phase were varied depending on each F area "island".
Both samples were embedded in an epoxy resin and subsequently polished and ion-milled (in order to prevent charging of the epoxy) prior to the EBSD measurements.
In Figure 1(b), EBSD inverse pole figure (IPF) mapping indicates representative fine and homogeneous tempered martensite structure.
Caption: Figure 3: Euler angle EBSD patterns of the cross section of an Al 6061 particle in the cold-sprayed coating [18].
Microstructural observations using EBSD and TEM revealed the deformation structure and the formation of nonequilibrium grain boundaries from one to eight ECAP passes.
Note here that the denominator '80' for austenite was selected to match the austenite volume fraction estimated from nanoindentation test (i.e., 80/400) with that estimated from EBSD (~20%) and, then, the denominator '280' for the tempered martensite was determined by subtracting the numbers of indentation data of the austenite (i.e., 80) and the untempered martensite (i.e., 40) from the total indentation data (i.e., 400).
Samples were then coated with a 2-nm thickness of carbon in a Baltec MED 020 electron beam evaporator (Baltec Corporation, Canonsburg, PA) (Center for Scientific Instrumentation, CIC, University of Granada, Spain) and analyzed in a Zeiss AURIGA CrossBeam workstation (operated at 20 kV; Carl Zeiss Microscopy, Jena, Germany) equipped with an Oxford Instruments NordlysNano EBSD detector (Oxford Instruments, Abingdon, UK) of the same Center.
The existing measurement methods of crystallographic orientations included etch-pit technique [4], neutron diffraction [5], electron backscatter diffraction (EBSD) [6-8], X-ray diffraction [9, 10], and micro-Raman spectroscopy [11].
Other combined studies, provided by EBSD technique and light microscopy [8], AE with neutron diffraction [9], have shown that {10-12}<-101-1> twins nucleate at the beginning of plastic deformation.
ESPRIT QUBE software from Bruker provides extensive tools for 3-D visualization and post-processing of data sets acquired with electron backscatter diffraction systems (EBSD) and/or energy-dispersive X-ray spectrometers (EDS).
The texture evolution was explored by EBSD in the flow or rolling plane (X-Y), Fig.