[PDF] Top 20 Mat. Res. vol.19 suppl.1

... August 19 and 20, 2015, organized by the Department of Engineering in Metallurgy and Materials, Instituto Politécnico Nacional, México, and by the Department of Materials Engineering, Federal University of São ... See full document

... The microstructure of the pure MNPs and the MNPs-As was analyzed in two ield emission microscopes, a scanning electron microscope (SEM) JEOL JSM-7401F and in a high resolution transmission electron microscope (HRTEM) ... See full document

... It is also possible to observe qualitatively the suppression of crystalline phases with decreasing longitudinal section due to increase in the cooling rate. The advantage of casting in a conical shaped mould is that the ... See full document

... Figure 2 shows the X-ray difraction patterns of the as-quenched ribbons. It can be observed that all the alloys have a halo without any peaks, which is a characteristic of an amorphous structure, i.e. indicating that ... See full document

... Figure 1 d), resulting grains with a size of 250- 500 nm and a thickness of 251 ...Table 1), it is observed that the values are very close, there is no signiicant diference between them, which means that ... See full document

... of the quasicrystalline phase and so it was not submitted to an annealing heat treatment. The quasicrystalline powders were then blended in a planetary ball mill for 5 hours with pure aluminum and 2124 aluminum alloy ... See full document

... peak (hkl) intensities in the range of 20º < 2θ < 80º. The LF varies between zero to unity; LF = 0 corresponds to random orientation, and LF = 1 to perfect orientation. Figure 2 shows the LF values for the ... See full document

... Elemental pure powders of Al, Co and Ni (all pass through 325-mesh, metal basis) supplied by Alfa Aesar with high purity (99.97, 99.5 and 99.8 % in weight) were used as starting metallic materials to prepare an ... See full document

... atmosphere. Rapidly solidiied (RS) samples up to 15at% Al, with compositions summarized in Table 1, were prepared by the splat cooling technique in Argon atmosphere. The microstructure and stability were ... See full document

... Figure 1, as strontium compounds are produced the three starting reagents, SrCO 3 , SrSO 4 and Al 2 O 3 , remaining quantity decreases, strontium sulfate only remains to the inal stage of the ... See full document

... (99.8%, Aldrich) and ferrocene (98%, Aldrich) were used as organic precursors, the second compound acted also as catalyst source. Reaction temperature was 760 ºC; time process was 1 hour with 80 ml/min constant ... See full document

... of 160 cm 3 containing 25 chromium steel milling balls was used. The ball-to-powder mass ratio was ixed at 40:1 and a hydrogen pressure of 3 MPa was employed. Reactive milling was performed in a Fritsch P6 ... See full document

... The average SDAS values (between 11mm and 15mm) measured in the Al-13Si alloy and in an additional hypoeutectic Al-10Si were used in equations (1) and (2) to estimate the cooling rate reached by the cooling ... See full document

... The powder shape is characterized by the surface contour of the individual particles, product of the manufacturing process to produce it. SEM micrographs of the pure elemental powders morphology are shown in Figure ... See full document

... The synchrotron x-ray scattering experiments were carried out at the Hard X-ray MicroAnalysis (HXMA) beamline at the Canadian Light Source (CLS) using X-ray energy of the Zr K-edge (wavelength 0.06884 nm). The sample was ... See full document

... (~1 wt%H after 2hs 15min). The low absorption rate could correspond to: a low fraction of free Mg in the alloy to form hydride and/or some barrier in the sample surface that prevents the difusion of hydrogen into ... See full document

... were synthesized by the microwave combustion synthesis method. The high purity precursors used in these reactions were: Fe(NO 3 ) 3 .9H 2 O (Merck), Co(NO 3 ) 2 .6H 2 O (Merck), and Ni(NO 3 ) 2 .6H 2 O (Merck) as oxidant ... See full document

... by subtracting the spectral difuse component from the total measurement. Moreover, the luorescence spectrum of the sample was measured using a modular spectroluorometer Horiba Fluorolog-3, which uses a 450-W Xenon CW ... See full document

... Scanning electron microscopy (SEM) characterization was conducted on a JEOL-JSM 7201F SEM/EDS. X-ray diffraction (XRD) analyses were carried out using a PAN analytical X´pert PRO diffractometer using a CuKα (λ = 1.5405 ... See full document

... Model SL II-10 was used as a laser source featuring 4 nanoseconds pulse duration at 532 nm wavelength and 1 mJ of average energy. Two incident beams, pump and probe, with irradiance relation 1:1 were ... See full document