In the transmission CT imaging system with scintillator-CCD detector using synchrotron monochromatic x-ray as sheet beam, improvement of reconstructed image quality is investigated, The properties of experimental facilities cause the incident beam intensity to be spatially inhomogeneous, and to temporally attenuate, In order to achieve more reliable reconstruction, we propose the data-correction and estimation method based on the properties of the facilities and the principle of CT reconstruction, and confirm ...
Eight kinds of RE-alpha-sialon (RE = Nd, Sm, Gd, Dy, Y, Ho, Er, Yb) were prepared by the sintering Si3N4, AlN and RE2O3 mixtures in a composition of RE(0.5)(Si,Al)12(O,N)16 in nitrogven, and characterized by X-ray diffraction (XRD) analysis. The lattice constants, a and c, of Nd- to Dy-alpha-sialons were almost constant. When ionic radius was smaller than that of Dy+3, lattice constants increased with decreasing ionic radius of RE+3. The ...
Structural changes induced by mechanical milling of Ni3Al has been studied using extended x-ray absorption fine-structure (EXAFS) technique. Results indicate that the final products of the transformation process was a Ni- rich nanocrystalline phase and an Al-rich phase. The Al-rich phase may be at the nanocrystalline boundaries and/or within the more extensive amorphous regions observed by TEM.
Creep curves of an aluminium matrix composite reinforced with continuous alumina fibers, which were obtained at various stress levels and temperatures between 573 and 773 k, were analytically examined. most of the creep curve at high stress could be approximately expressed by logarithmic creep; this type of creep may be associated with the exponential creep law of the aluminium matrix.
This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, data, dr mmc, experimental, mmc, mmc data materials and material types:, (al2o3)p/al, (al4c3)p/al, al matrix, al2o3 particulates, al2o3/al, al4c3 matrix, al4c3 particulates, al4c3/al, particulates material characteristics and data fields:, creep behaviors, creep fractures, creep rate data, mechanical properties, rupture data, strain, strain data, stress data, tensile strength, yield strength, parameter values ...
To examine the effect of short fiber reinforcement on creep behavior, such as creep rate, creep curve shape and their stress and temperature dependences, creep tests were done on aluminum matrix composites reinforced with alumina short fibers, mainly with 10% vol alumina. creep curve shape varied with applied stress and was associated with the initial instantaneous strain after loading. that is, at stresses lower than a critical stress the instantaneous ...
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