Weibull analysis evaluation of Ti, B, Nb and MTS grain refined Al11Si alloy

Aydogan, Ferhat; Dizdar, Kerem Can; Sahin, Hayati; Mentese, Elvan; Dışpınar, Derya

doi:10.1016/j.matchemphys.2022.126264

Cited by 5 publications

(2 citation statements)

References 28 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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“…These finely dispersed species are highly efficient nuclei that promote a fine equiaxed grain growth during solidification. Aydogan [19] had shown the statistical analysis of tensile property change of different grain refiners.…”

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confidence: 99%

Archives of Foundry Engineering

Aydogan,

Dizdar,

Sahin

et al. 2022

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In this work, 25 wheels were cast with three different grain refiners: Al5Ti1B, Al3Nb1B and MTS 1582. Samples were machined from the wheels to check the mechanical properties. It was found that Nb grain refinement had the lowest grain size (260 mm) and highest tensile properties (yield strength of 119-124 MPa and ultimate tensile strength of 190-209 MPa). Al5Ti1B and MTS 1582 revealed quite similar results (110 MPa yield and 198 MPa ultimate tensile strength). The fading of the grain refining effect of Al5TiB1 master alloy was observed in both Nb and Ti added castings whereas during the investigated time interval, the fading was not observed when MTS 1582 was used.

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