Results 271 to 280 of about 286,218 (312)
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Crystal growth and phase transformation in the precipitation of calcium phosphates
Faraday Discuss. Chem. Soc., 1976Calcium phosphate precipitation in the neutral and slightly acidic pH range is presented. The concentration regions within which precipitates are formed by direct crystallization and via precursors phases are defined. Nucleation mechanisms and kinetics of crystal growth of amorphous calcium phosphate and calcium monohydrogen phosphate dihydrate are ...
Furedi-Milhofer, Helga +2 more
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Coarsening and phase transition of FeSi2 precipitates in Si
Journal of Applied Physics, 1994FeSi2 precipitates were produced in Si(001) wafers by an ion-beam induced epitaxial crystallization process and subsequently annealed at temperatures in the range 650–900 °C. The resulting precipitate coarsening and phase transition were studied by transmission electron microscopy. The coarsening process basically involves the evolution of plate-shaped
Lin, X.W. +3 more
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On the precipitation of delta phase in ALLVAC®718Plus
Philosophical Magazine, 2014ALLVAC 718Plus is a new commercial superalloy derived from Inconel 718, but possessing a higher temperature capability whilst employing the same philosophy regarding the microstructure.
Mess??, OM +4 more
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Abnormal precipitation behavior of Ni3Al phase
Materials Science and Engineering: A, 2008Evolution of Ni3Al phase in a nickel-base directionally solidified superalloy has been investigated during creep rupture testing (1253 K/150 MPa). Besides the splitting, rafting and Ostwald ripening cases, many finer Ni3Al particles have been firstly observed to precipitate from the rafted Ni3Al particles.
Kai Zhao, Y.H. Ma, L.H. Lou, Z.Q. Hu
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Observations on phase transformation of a precipitated calcium phosphate
Calcified Tissue Research, 1971Precipitates of calcium phosphate were obtained from aqueous media, some of which contained Mg2+ and F−. Initial solids removed as a slurry were shown by electron diffraction to be amorphous when Mg2+ and F− were not present. Subsequent ageing for 24 h in the supernatant induced a change in morphology and diffraction pattern as observed with the ...
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Discontinuous precipitation of the ??-phase in �I437 alloy
Soviet Physics Journal, 1969The treatment which results in the maximum discontinuous precipitation of the γ′-phase in EI437 alloy has been determined. The effects of the quenching temperature, aging temperature, and degree of deformation on this precipitation were studied.
V. F. Sukhovarov +2 more
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Phase transformation of precipitated TiO2 nanoparticles
Materials Science and Engineering: A, 2003Hydrous TiO2 powders were obtained from the TiCl4 precursor precipitated under different pH values by adding aqueous ammonia. The prepared titania exists in the form of nanocrystalline anatase with some brookite phase. The volume fraction of brookite phase increases with the decrease of the synthesized pH value. The beginning and ending temperature for
Y Hu, H.-L Tsai, C.-L Huang
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The precipitation of the Q phase in an AA6111 Alloy
Metallurgical and Materials Transactions A, 2001The precipitation behavior of the quaternary Q phase in an Al 6111 alloy has been studied by analytical electron microscopy. The transformation strain associated with the Q phase has been determined from high resolution electron microscopy and electron diffraction. The habit plane of the Q laths is shown to be fully coherent with the Al matrix.
G. C. Weatherly +4 more
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The Effect of Precipitated Phases on Creep Behavior
Applied Mechanics and Materials, 2014The effect of precipitated phases on the creep in 300s type austenitic stainless steel used in auto-tailpipe was studied. Flat tensile samples with marker scratches on the surface were strained at slow rate at 400°C. It show that the sensitized material decreased creep rate and needed more stress to generate deformation of grain boundary, suggesting Cr
Jian Qiang Zhang +5 more
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Precipitate phases in an Al-SiC composite
Proceedings, annual meeting, Electron Microscopy Society of America, 1984The modulus of many aluminum alloys can be greatly increased by the addition of small amounts of silicon carbide. The resulting composite material is also stronger than the unreinforced alloy, but exhibits poor fracture toughness. The reason for the low ductility of Al-SiC composites is unknown, although results presented here indicate that embrittling
S.R. Nutt, R.W. Carpenter
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