Synergistic effect of ultrasonic melt treatment and fast cooling on the refinement of primary Si in a hypereutectic Al–Si alloy

Jung, Jae‐Gil; Ahn, Tai Young; Cho, Young-Hee; Kim, Su-Hyeon; Lee, Jung-Moo

doi:10.1016/j.actamat.2017.10.039

Cited by 102 publications

(25 citation statements)

References 31 publications

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“…This is an important factor in the grain refinement efficiency of a P-based master alloy. The size of the AlP phase, however, must be within the allowable limits to act as inoculants [22] . The AlP phase needs to be dissociated to a much smaller size to act as seed for the primary silicon.…”

Section: Grain Refinement Mechanism Of Various P-containing Compoundsmentioning

confidence: 99%

Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Njuguna

Tan

et al. 2021

China Foundry

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A l u m i n u m-b a s e d a l l o y s a r e t h e m o s t w i d e l y used engineering materials in the automotive and aeronautical industries due to their high strength-toweight ratio and high wear resistance [1-5]. Hypereutectic Al-Si alloys are particularly preferred as they exhibit a low coefficient of thermal expansion and a hightemperature strength [2-11]. These properties are attributed to the presence of the primary silicon phase in the aluminum matrix [7]. The castability of the alloy is also enhanced by the addition of silicon in the alloying process, by improving the melt flow [12]. However, the conventional casting procedures produce coarse grains of the primary silicon. These coarse grains are prone to premature crack initiation and fracture when subjected to tension loading [3,5,6,9] , which decrease the mechanical properties of the alloy [1]. Many methods are used in the refinement and modification of the primary silicon phase to achieve optimum morphology for improving the mechanical

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Section: Grain Refinement Mechanism Of Various P-containing Compoundsmentioning

confidence: 99%

Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Njuguna

Tan

et al. 2021

China Foundry

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“…The main refine mechanisms involve the implosive collapse of cavitation bubbles fragments the dendrites and intermetallic phases, and acoustic streaming ensure the fragments are uniformly distributed in the melting [8,9]. It is well-recognized that the refined and equiaxed grain structures, pore-elimination and homogenous microstructure can be obtained by USP [11,12,13]. Very limited literature has focused on the effect of USP on the intermetallic phase, such as Fe-rich phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of Compound Fields of Ultrasonic Vibration and Applied Pressure on the 3D Microstructure and Tensile Properties of Recycled Al-Cu-Mn-Fe-Si Alloys

et al. 2019

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The effect of compound fields of ultrasonic vibration and applied pressure (UV+AP) on three-dimensional (3D) microstructure and tensile properties of recycled Al-Cu-Mn-Fe-Si alloys was systematically studied using conventional two-dimensional (2D) microscopy, synchrotron X-ray tomography, and tensile test. The properties of UV+AP treated alloys with the pouring temperature of 740, 710 and 680 °C were compared when those alloys achieved after gravity casting. After UV+AP treatment, the alloy with pouring temperature of 710 °C show the smallest grain size. Also, the sizes of Fe-rich phases and Al2Cu are greatly reduced and their 3D morphologies are compacted. The mechanical properties of UV+AP treated alloys are relatively higher than those measured for gravity cast equivalents. This improvement can be explained by the synergistic effect of acoustic cavitation, acoustic streaming, and force-feeding, which resulted in the dendrite fragmentation, uniform solute distribution, and microstructural refinement. The Orowan strengthening and solution strengthening were identified as the main strengthening mechanisms.

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“…Nevertheless, the stress concentration is easily generated by the coarse irregularly shaped primary Si and plate–like eutectic Si, which can adversely affect the mechanical properties of Al–Si alloys, particularly the plasticity [4,5]. In order to achieve good mechanical properties, the primary Si refinement and eutectic Si modification must be achieved simultaneously, which can be realized by several methods including rapid solidification [6], melt overheating [7], ultrasonic vibration [8], electromagnetic field [9], and chemical modification [10]. In these technologies, chemical modification has found wide application in the industry due to the advantages of simple operation and low cost.…”

Section: Introductionmentioning

confidence: 99%

Different Influences of Rare Earth Eu Addition on Primary Si Refinement in Hypereutectic Al–Si Alloys with Varied Purity

Mao

Wei

et al. 2019

Materials

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The effect of alloying the Eu element on primary Si refinement in varied purity Al–16Si alloys was studied by scanning electron microscopy (SEM), thermal analysis, micro x–ray diffraction (μ–XRD), electron probe microanalysis (EPMA), and transmission electron microscopy (TEM). The results indicate that the P impurity element in hypereutectic Al–Si alloys has a great influence on the rare earths’ refinement efficiency of primary Si. Coinstantaneous primary Si refinement and eutectic Si modification by Eu was obtained in high purity (HP) Al–16Si and commercial purity (CP) Al–16Si–0.06P alloys, but the primary Si was gradually coarsened in CP Al–16Si alloys. An excellent integration of ultimate tensile strength (144.8 MPa) and elongation (9.8%) of CP hypereutectic Al–16Si–0.06P alloy was obtained by adding 0.15% Eu. The refinement of primary Si in Eu–modified HP Al–16Si alloys was related to the constitutional undercooling of Eu. There was no sufficient Eu element partition into the primary Si particles, and fewer parallel twins, rather than multiple twins, were observed within them. The refinement of primary Si in CP Al–16Si–0.06P alloys was caused by the overlay of two kinds of mechanisms including the heterogeneous nucleation mechanism of AlP and the constitutional supercooling mechanism of Eu. However, in order to refine the primary Si in CP hypereutectic Al–16Si alloys, the Eu:P weight ratio should not exceed 3.33, otherwise the refinement efficiency of primary Si will be reduced due to mutual poisoning between Eu and P. This work can be used to interpret the controversy concerning the influence of rare earths on the primary Si in hypereutectic Al–Si alloys, thereby elucidating the importance of alloy purity to primary Si refinement by rare earths.

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Synergistic effect of ultrasonic melt treatment and fast cooling on the refinement of primary Si in a hypereutectic Al–Si alloy

Cited by 102 publications

References 31 publications

Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Effect of Compound Fields of Ultrasonic Vibration and Applied Pressure on the 3D Microstructure and Tensile Properties of Recycled Al-Cu-Mn-Fe-Si Alloys

Different Influences of Rare Earth Eu Addition on Primary Si Refinement in Hypereutectic Al–Si Alloys with Varied Purity

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