Study on the effect of prolonged mechanical vibration on the grain refinement and density of A356 aluminum alloy

Taghavi, Farshid; Sadrnia, Hassan; Kharrazi, Y. H. K.

doi:10.1016/j.matdes.2008.07.032

Cited by 77 publications

(47 citation statements)

References 11 publications

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“…When the frequency increased to 30 Hz, the grain size decreased obviously. 44,45) With regard to our research, the super gravity were G = 100, 300 and 600, corresponding to the rotation speed of 600 r/min, 1 039 r/min and 1 460 r/min. So the vibration frequency is approximately 10 Hz, 17.3 Hz and 24.3 Hz, which were rather low frequency.…”

Section: Figmentioning

confidence: 91%

Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

et al. 2018

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Section: Figmentioning

confidence: 91%

Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

et al. 2018

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“…It is clear that the mechanical vibration greatly increases the densities of A356 aluminum alloy, especially the vibration with a higher frequency. It can be explained by the fact that the mechanical vibration promotes the filling ability and feeding capacity of the molten metal [15,20,24], resulting in the improvement of density of the A356 aluminum alloy. However, the excessive vibration frequency greatly increases the disturbance of the molten metal, which may generate porosity defects due to gas trapping of the molten metal, leading to the decrease of 9 Representative cooling curves of the molten metal recorded with and without vibration conditions density of the A356 aluminum alloy.…”

Section: Methodsmentioning

confidence: 99%

“…The mechanical vibration has the potential to be a simple, economic, and effective method to refine microstructure and improve mechanical properties [15,16], which was first applied on the steel by Chernov [17]. In this study, a simple and economic mechanical vibration method was first introduced into the solidification process of the A356 aluminum alloy during the expendable pattern shell casting process in order to improve the microstructure and mechanical properties of the A356 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Jiang

Wang

et al. 2015

Int J Adv Manuf Technol

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A simple, economic, and effective mechanical vibration method was introduced into the solidification process of A356 aluminum alloy during the expendable pattern shell casting process, and the effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of the A356 alloy were investigated. Obtained results showed that the sizes and morphologies of α-Al primary phase and eutectic silicon particles were significantly improved by the mechanical vibration, and the mechanical properties and density of the A356 alloy greatly increased. With increasing vibration frequency, the grain size and secondary dendrite arm spacing (SDAS) continuously decreased, and the shape factor increased, and the mechanical properties and density of the A356 alloy gradually increased. With a vibration frequency of 100 Hz, the grain size and SDAS decreased by 32 and 19 %, respectively, and the shape factor increased by 262 %, and the average length, width, and aspect ratio of the silicon particles decreased by 45, 6, and 42 %, respectively, compared to that of the sample without vibration. Meanwhile, the tensile strength, yield strength, elongation, and hardness of the A356 alloy sample were, respectively, 35, 42, 57, and 28 % higher than those of the sample without vibration. In addition, the mechanical vibration changed the fractograph of the A356 alloy from a clear brittle fracture nature of the alloy without vibration to an obvious dimple fracture nature, and with the increase of vibration frequency, the dimples were very deep and well distributed with a high density.

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“…That is, the size of the primary solid phase decreased with increasing vibration times to 15 min, but the size increased with increasing vibration times of more than 15 min. Furthermore, the increment of frequency and vibration time up to 15 min led to an increase in the density of A356 aluminum alloys: a high density of 2.68 g/cm 3 was obtained at 50 Hz [6]. The effect of the UV process during the casting process on material properties in 7050 aluminum alloy was examined [7], and a finer microstructure that made a high-strength alloy was obtained.…”

Section: Introductionmentioning

confidence: 99%

Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

Okayasu

Miyamoto

Morinaka

2015

Metals

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This work was carried out to develop high-quality cast aluminum alloys using a new casting technology. For this purpose, commercial Al alloys were created by heated mold continuous casting (HMC) with ultrasonic vibration (UV). With the HMC process, the grain size and the crystal orientation of the Al alloys were controlled, i.e., fine grains with a uniformly organized lattice formation. In addition, an attempt was made to modify the microstructural formation by cavitation. These microstructural characteristics made excellent mechanical properties. Using UV in the continuous casting process, more fine and spherical grains were slightly disordered, which was detected using electron backscattered diffraction. The mechanical properties of the UV HMC Al alloys were slightly higher than those for the related cast Al alloys without UV. Moreover, the severe vibration caused higher mechanical properties. The lattice and dislocation characteristics of the cast samples made with and without UV processes were analyzed systematically using electron backscattered diffraction.

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Study on the effect of prolonged mechanical vibration on the grain refinement and density of A356 aluminum alloy

Cited by 77 publications

References 11 publications

Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

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