Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy

Aghayani, M. Khosro; Niroumand, Behzad

doi:10.1016/j.jallcom.2010.08.139

Cited by 141 publications

(27 citation statements)

References 25 publications

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“…In general, the refinement of microstructure mainly has the following methods, such as chemical elements modification [9][10][11], electromagnetic vibration [12], ultrasonic vibration [13], and mechanical vibration [14]. 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].…”

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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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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“…Therefore, the fragmentation effects of cavitation and acoustic streaming phenomena were not expected to be contributing factors to the microstructure improvement. The changes brought about by ultrasonic treatment in the microstructures of the alloy were thought to be mostly related to the effects of ultrasonic cavitation on the cleaning the surfaces of the poorly wetted particles in the melt, thereby enhancing their nucleation potency [14,15]. Furthermore, disintegration and distribution of the agglomerated nucleant particles existing in the melt under the effects of cavitation and acoustic streaming also increased the number of effective nucleation sites.…”

Section: Resultsmentioning

confidence: 99%

Effect of power ultrasonic on solidification microstructure of Al-Ni-Zn-Mg aluminum alloy

Shao¹,

Xu²,

Zeng³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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Abstract. The effect of power ultrasonic on the solidification microstructure of a newly developed Al-Ni-Zn-Mg aluminum alloy has been investigated. The melt of the alloy was treated by ultrasonic field with different powers from 0W to 850W. Without high-energy ultrasonic treatment, the eutectic Al 3 Ni phases with coarse long dendritic-shape were observed in the aluminum matrix, and its size could be much more than 50µm. With the ultrasonic field of power more than 450W introducing into the melt, the morphologies of the Al 3 Ni phases were changed into short rod-shape or particle-shape and the distributions were nearly uniform. Meanwhile, the influence of ultrasonic treating time and ultrasonic treating temperature on the morphologies of the Al 3 Ni phases was studied. The results showed that ultrasonic treatment of the proper time such as 180s for the Al-Ni-Zn-Mg alloy could result in considerable improvement of the morphologies of the Al 3 Ni phases. The morphologies and the size of the eutectic Al 3 Ni phases were gradually improved with the increase of temperature from 680˚C to760˚C.

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“…The finest grain size and best globularity could be observed in the 0.6 kW trials, which is assumed to be the balance point between a lower energy that is not able to refine grains and a higher energy that raises the melt temperature overmuch. Aghayani et al investigated not only the microstructural changes, but also the phase amount and distribution, and strength in a conventional sand cast AZ91 alloy [17]. It was found that with UST (20 kHz; 120 W, 240 W, 360 W) applied for five minutes it significantly influences the size and sphericity of α-Mg dendrites as well as the intermetallic particles Mg 2 Si, MnFeAl(Si), and Mg 17 Al 12 .…”

Section: Effect Of Ultrasound On Magnesium Alloysmentioning

confidence: 99%

Processing of Magnesium-Based Metal Matrix Nanocomposites by Ultrasound-Assisted Particle Dispersion: A Review

Dieringa

2018

Metals

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Magnesium-based metal matrix nanocomposites (MMNCs) are an important topic in the development of lightweight structural materials, because their optimized properties are of great interest to the automotive and aerospace industries. Moreover, components with functional properties will also be manufactured from Mg-MMNCs in the future. With a large surface to volume ratio, nanoparticles in the magnesium matrix have an immense effect on mechanical properties, even at low concentrations. The mechanical properties of these materials can be tailored using ceramic nanoparticles, which have been available at a very low cost for a number of years. However, the particle concentration, chemical composition, particle size, and process parameters must be attuned to the respective alloy, in order to influence the resulting properties. When using very small particles, a major problem is to homogeneously distribute the particles in the melt. Due to their large surface area, strong van der Waals forces act to hold the particles together in clusters. At the same time, wettability of the particles with a magnesium melt is very poor. Ultrasonic stirring processes have proven their effectiveness in the de-agglomeration and dispersion of nanoparticles. This review presents ultrasound-assisted processes for the production of these materials and describes some properties of the resulting Mg-MMNCs.

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Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy

Cited by 141 publications

References 25 publications

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

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

Effect of power ultrasonic on solidification microstructure of Al-Ni-Zn-Mg aluminum alloy

Processing of Magnesium-Based Metal Matrix Nanocomposites by Ultrasound-Assisted Particle Dispersion: A Review

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