Effects of grain refinement on the microstructure, mechanical properties and reliability of AlSi7Cu3Mg gravity die cast cylinder heads

Timelli, Giulio; Camicia, Giordano; Ferraro, Stefano; Molina, R.

doi:10.1007/s12540-014-4013-2

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…Adequate control of liquid metal quality and solidification microstructure are essential prerequisites for manufacturing high-quality aluminum castings [ 1 , 2 , 3 ]. Chemical grain refinement is commonly applied during the processing of aluminum alloy melts to induce the formation of fine equiaxed α-Al grain structure in castings, which usually results in better mechanical properties and reliability [ 4 , 5 , 6 , 7 ]. During the addition of grain refiner master alloys, a high number of solid particles are introduced into the liquid alloys that can act as heterogeneous nucleation sites for the primary α-Al dendrites during solidification.…”

Section: Introductionmentioning

confidence: 99%

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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Grain refiner particles, which are intended to induce the formation of fine equiaxed grain structure during the solidification of aluminum alloys, are prone to settling during the holding of the liquid metal, which phenomenon can affect not only the grain size but the spatial distribution of the double oxide films in the melt. In this study, the settling of Al3Ti inoculant particles, as well as its effects on melt quality and grain refinement, were studied. During the experiments, the Ti-concentration of a liquid Al-Si-Mg-Cu alloy was increased to 0.3 wt.% by the addition of Al-10%Ti master alloy at different melt temperatures. Particle settling and grain size evolution were studied by quantitative metallography, while the interactions of grain refiners and bifilms were investigated by scanning electron microscopy (SEM). The evolution of melt quality was assessed by the computed tomographic (CT) analysis of reduced pressure test (RPT) samples. It was found that effective grain refinement was only realized when the introduced blocky Al3Ti particles were dissolved and re-precipitated in the form of (Al,Si)3Ti at a lower temperature. Without dissolving at higher holding temperatures, Al3Ti particle settling has taken place within 10 min. The settling of (Al,Si)3Ti particles improved melt quality by the aided sedimentation of bifilms in the melt.

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Section: Introductionmentioning

confidence: 99%

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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“…In the early days of SSM and CRP developments [8][9][10][11][12], it was thought that one had to cool the liquid down into the two-phase region. In recent years, the projects sponsored by the National Research Program KC02-23/06-10 and by the Department of Science and Technology of Hanoi City, were carried out by the research team of the Key Laboratory of Metal Materials Technology to produce a semi-solid structure of the globular primary alpha phase via continuous rheocasting and rheo-die casting [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pressure on Solidification Process and Mechanical Properties During Semi-Solid Casting by Computational Fluid Dynamics (CFD)

Hai¹

2018

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This paper focused on the development of Computational Fluid Dynamics (CFD) by a mathematical model based on the control volume method, which would enable efficient simulation of the semi-solid processing of complex industrial casting parts. Theoretical basis of the numerical simulation was briefly introduced. The latent heat was incorporated using the effective specific heat. The mass, momentum and enthalpy transport equation for each phase were solved. The application of the model allowed determining the temperature fields in the metal and the mold at 1 sec and the liquid fraction at time step 0.15 s with three different pressure regimes. The calculated pressure distribution and the evolution of liquid fraction through the material were examined and used to clarify their influence further investigated with tensile and hardness testing.

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“…The influence of particles or fibers on the stress necessary for plastic deformation of a composite may be attributed to several mechanisms: (a) increase in grain boundary area due to grain refinement, also known as the Hall-Petch strengthening [4]; (b) increase in the dislocation density accommodating the thermal stresses in the particle/matrix interface, which are due to a large difference in the CTEs of the matrix and the *Corresponding author: heeman@kookmin.ac.kr, mathis@met.mff.cuni.cz KIM and Springer…”

Section: Introductionmentioning

confidence: 99%

In situ investigation of deformation mechanisms in magnesium-based metal matrix composites

et al. 2015

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We studied the effect of short fibers on the mechanical properties of a magnesium alloy. In particular, deformation mechanisms in a Mg-Al-Sr alloy reinforced with short alumina fibers were studied in situ using neutron diffraction and acoustic emission methods. The fibers' plane orientation with respect to the loading axis was found to be a key parameter, which influences the acting deformation processes, such as twinning or dislocation slip. Furthermore, the twinning activity was much more significant in samples with parallel fiber plane orientation, which was confirmed by both acoustic emission and electron backscattering diffraction results. Neutron diffraction was also used to assist in analyzing the acoustic emission and electron backscattering diffraction results. The simultaneous application of the two in situ methods, neutron diffraction and acoustic emission, was found to be beneficial for obtaining complementary datasets about the twinning and dislocation slip in the magnesium alloys and composites used in this study.

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Effects of grain refinement on the microstructure, mechanical properties and reliability of AlSi7Cu3Mg gravity die cast cylinder heads

Cited by 11 publications

References 34 publications

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Effect of Pressure on Solidification Process and Mechanical Properties During Semi-Solid Casting by Computational Fluid Dynamics (CFD)

In situ investigation of deformation mechanisms in magnesium-based metal matrix composites

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