Origin of microstructure in faceted/nonfaceted eutectic alloys
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Origin of microstructure in faceted/nonfaceted eutectic alloys by Simin D. Bagheri

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Published by National Library of Canada = Bibliothèque nationale du Canada in Ottawa .
Written in English

Book details:

Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
Pagination2 microfiches : negative.
ID Numbers
Open LibraryOL14778032M
ISBN 100315785772

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  For eutectic alloys with at least two phases, the microstructure may exhibit different kinds of morphologies, based on the alloy composition and the solidification condition. The regular rod/lamellar microstructures are grouped into normal eutectics, while the broken-lamellar, irregular, complex-regular or quasi-regular eutectics are named Cited by:   Tensile testing showed that the as-cast AlCoCrFeNi alloy possessed an excellent combination of high strength and high ductility owing to the uniform FCC(L1 2)/BCC(B2) lamellar microstructures. Fig. 2 shows the tensile engineering and true stress–strain curves of the as-cast AlCoCrFeNi alloy. It is evident that the ultimate tensile stress was ± 50 MPa and the ductility Cited by:   T he effect of shear-induced convection on the solidification behavior and microstructural evolution of eutectic alloys has been a promising subject of many studies in the last several decades. In the s, on the basis of Jackson and Hunt’s model,[] Verhoeven and Homer[] reported that the convective flow produced little effect on eutectic growth in the eutectic by: 7.   Thus, the observed good response [Fig. 2(a, b)] is due to the nature of faceted/ nonfaceted eutectic growth. It has, however, been shown [14] that dur- ing directional solidification of AI-Si alloys, there is a propensity for nucleation and growth of equiaxed eutectic grains ahead of an otherwise planar and directional eutec- tic front.

  The results are compared with those previously obtained in the Fe-C and Fe-Fe3C alloys, the latter being shown to be an irregular eutectic despite the regularity of the microstructure . The alloy exactly at the eutectic at 12% Si would have neither the primary Si phase nor the primary Al phase, but only the eutectic structure throughout. This is the theory according to the simple binary Al–Si phase diagram, but, in reality, it is more complicated, because of eutectic Si modifiers, faster cooling rates and the additions of. This article focuses on the metallography and microstructures of wrought and cast aluminum and aluminum alloys. It describes the role of major alloying elements and their effect on phase formation and the morphologies of constituents formed by liquid-solid and/or solid-state transformations. Volume 3 provides a complete explanation of phase diagrams and their significance and covers solid solutions; thermodynamics; isomorphous, eutectic, peritectic, and monotectic alloy systems; solid-state transformations; and intermediate phases.

Book. Full-text available (faceted–non-faceted) eutectic. Our dynamic and 3D synchrotron-based X-ray imaging results reveal the markedly different microstructural and, for the first time. aluminum macrostructure and microstructure occur simultaneously with the freezing, homogenization, preheat, hot or cold reduction, annealing, or solution or precipitation heat treatment of the aluminum alloy. Good interpretation of microstructure relies on having a complete history .   Fig. 2 shows the microstructure of the cross-sectional structure after laser cladding (laser scan velocity was 1 mm/s, single layer). Fig. 2(a) is the overall morphology of the cladding layer, the cladding height was about 1 mm, Fig. 2(b) shows the microstructure at the bottom of the cladding layers, there was coarse α-Ni columnar dendrites and regular lamellar eutectic in this area, most of. Growth of faceted/nonfaceted eutectic structures There exist many remaining questions regarding faceted/nonfaceted eutectic alloys although they have been extensively used in the industry. The goal of this project is to investigate and characterize various microstructures obtained in Cu-B and AMPD-SCN systems employing different compositions.