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Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685, 2017년, pp.235 - 243   SCI SCIE
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Tensile properties and related microstructural aspects of hypereutectic Al-Si alloys directionally solidified under different melt superheats and transient heat flow conditions

Reyes, Rodrigo V. (Department of Materials Engineering, Federal University of Sã ); Bello, Thomas S. (o Carlos – ); Kakitani, Rafael ( UFSCar, 13565-905 Sã ); Costa, Thiago A. (o Carlos, SP, Brazil ); Garcia, Amauri ( Department of Materials Engineering, Federal University of Sã ); Cheung, Noé (o Carlos – ); ( UFSCar, 13565-905 Sã ); Spinelli, José (o Carlos, SP, Brazil ); E. ( Department of Manufacturing and Materials Engineering, University of Campinas, UNICAMP, 13083-860 Campinas, SP, Brazil );
  • 초록  

    Abstract The present investigation deals with directional solidification (DS) of Al-15wt% and 18wt% Si alloys under transient heat flow conditions and further characterization of the related microstructures. Emphasis is given on the eutectic growth being affected not only by solidification kinetics but also by melt superheat, which is varied in two degrees for each alloy, i.e., 6% and 23% above the liquidus temperature. The dependences of interphase spacing (λ) on both solidification kinetics (fast, intermediate and slow cooling conditions) and on melt superheat during solidification of hypereutectic alloys are reported for the first time. Furthermore, functional experimental interrelations of tensile mechanical properties and interphase spacing between eutectic Si particles of both alloys evaluated are proposed. It is shown by these correlations that the tensile properties increase with the decrease in these spacings. More significant variations in properties are associated with a certain range of spacings (1.0μm −1/2 ) has been verified for the present tested alloys and experimental conditions.


  • 주제어

    Al-Si alloys .   Solidification .   Microstructure .   Mechanical properties.  

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