Papers by Keyword: Pole Figure

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Authors: Md. Anowar Hossian, Man Bae Lim, Sun Chul Huh, Won Jo Park
Abstract: This study evaluated fatigue crack growth characteristics, Besides consider compressive residual stress effect and verified the most suitable shot peening velocity. Fatigue crack growth delay effect was compressive residual stress, but over peening did action projecting velocity that accelerate fatigue crack growth rate. X-ray diffraction technique according to crack length direction was applied to fatigue fractured surface. Fracture mechanics parameters could be estimated by the measurement of X-ray parameters, and the fractography observation was performed using a scanning electron microscope (SEM) for fatigue fracture surface. As the shot peening velocity increases, striation width increased. The changes in X-ray material parameters described above are directly related to the process of fatigue until the initiation of fatigue crack and X-ray diffraction pattern is thought that failure prediction with stress distribution is possible.
Authors: Rodrigo Santiago Coelho, Manuela Klaus, Christoph Genzel
Abstract: Possibilities for depth resolving texture analysis applying energy-dispersive X-ray synchrotron diffraction are presented. Exploiting the advantage of having the complete diffraction spectra observed in a fixed but arbitrary measuring direction, two different approaches for high spatial resolution analyses are discussed. The first allows fast access of intensity distribution from plan families {hkl} parallel to the sample surface. The latter allows successful pole figure assessment despite the complex and time consuming slit alignment and data processing. The size of the sampling volume can be tailored to the sample problem ranging from 10 to 100 µm in height or more if necessary.
Authors: Wei Ping Xu, Li Xing, Ling Min Ke
Abstract: The grain orientations and microtextures in a friction–stir–welded magnesium alloy AZ80A were analyzed by Orientation Imaging Microscopy (OIM).The results showed that times random of grain orientations in the nugget zone were not strong and orientations were variety. They brought on very fine equiaxed grains. It also showed that deformation texture of {1,-1,0,4}<1,0,-1,0> was a few departure 20deg from the sample normal, The grains in the nugget zone from the base metal inherited the deformation texture of {1, -1,0,4}<1,0,-1,0> . It was concluded that re-crystallized grains in the nugget zone formed by a continuous dynamic re-crystallized mechanism.
Authors: Abdelilah Benmarouane, Helene Citterio-Bigot, Pierre Millet, Thomas Buslaps, Alain Lodini
Abstract: Technology developments of implant composition and manufacture have been used in the medical field. Several different implants have been developed with varying degrees of commercial success. As a long-term establishment is a measure of the therapeutic success, it is necessary to use biocompatible implants in order to have good mechanical and fracture resistance of new bone reconstructed at the interface with the implant. Titanium (Ti-Al-4V) implants coated with hydroxyapatite (HAp), Ca10 (PO4)6 (OH)2 are widely used in orthopedic applications in order to obtain a stable and functional direct connection between the bone and the implant. At the implant-bone interface the new bone reconstituted after implantation must have the same orientation as the natural bone in order to accept the implant. Therefore we studied the texture and the crystallinity of the new bone crystals reconstituted at the interface applying by high-energy synchrotron radiation on beamline ID15 at ESRF in Grenoble, France.
Authors: S. Omae, C. Okamoto, H. Takakura, Y. Hamakawa, Mikio Murozono
Authors: Ming Lin Jin, Cun Fu Zhu, Zhan Yong Wang, Qi Zhong Chen, Ke Jia Liu
Abstract: The Sr0.75La0.25Fe11.75-xCo0.25ZnxO19 hexaferrites are prepared by the ceramic process. Influences of the substitution of Zn2+ ions on crystallographic texture have systematically been investigated by pole figure analysis. The (008) and (107) pole figure shows that the pole intensities are axisymmetric at the center of c axis. With the increase of x, the lattice parameters a and c increase gradually till x=0.15. Excessive Zn2+ addition induces the much coarse grain. The easy-axis alignment of grains decreases from 77.5% to 75.5% for the substitution of Zn2+ ions from 0 to 0.25. When Zn2+ content was from 0 to 0.25, the magnetic properties of Br and (BH)max were increased, while Hcb and Hcj were decreased till x>0.2.
Authors: G. Penneman, Isabel Van Driessche, E. Bruneel, Serge Hoste
Authors: Olga Krymskaya, Margarita Isaenkova, Yuriy Perlovich
Abstract: The method for grain size determination by statistical fluctuations of X-ray intensity, registered during measurement of texture pole figures, was developed. Niobium and bronze rods as well as tubes from Zr-1%Nb alloy, subjected to annealing at different temperatures, were studied. Description of the method, pole figures (PF), X-ray intensity distribution within PF circular sections, grain size values and their errors are presented.
Authors: U. Zink, Heinz Günter Brokmeier, Hans Joachim Bunge
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