Grain refinement of AZ91 alloy by introducing ultrasonic vibration during solidification

Liu, Xinbao; Osawa, Yosuke; Takamori, Susumu; Mukai, Toshiji

doi:10.1016/j.matlet.2008.01.063

Cited by 114 publications

(47 citation statements)

References 7 publications

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“…The composite clad thickness and C/I ratio of 60.11 µm and 61.04%, respectively, was observed for URM specimens. It has been widely recognized that ultrasonic vibrations cause cavitation and improve fluid convection in the solidifying melt [13,16]. The effects of ultrasonic vibration assistance have been utilized for grain refinements in the castings [17].…”

Section: Clad Layer Characteristicsmentioning

confidence: 99%

“…The laser remelting of the Al-SiC composite layer is expected to modify the microstructure and distribution of the particles in the composite layer. As ultrasonic vibrations have been proven effective for improving fluid convection and cavitation in the melt [13,14], the application of such vibrations to the surface during laser composite surfacing is also likely to improve the distribution of the particles in the melt. Detailed analysis of the effect of laser remelting and simultaneous application of ultrasonic vibrations during melting on the thickness of composite clad layer, microstructure, phase evolution, and tribological properties is presented.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Laser Remelting and Simultaneous Application of Ultrasonic Vibrations during Laser Melting on the Microstructural and Tribological Properties of Laser Clad Al-SiC Composites

2017

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Laser composite surfacing of aluminum alloys with ceramic particles has been extensively investigated for improving tribological properties. However, the process often results in incomplete penetration of ceramic particles in the melt pool and undesirable interfacial reactions. In this paper, laser composite surfacing of 2024 aluminum alloy with SiC particles is investigated using two distinct approaches: laser remelting and laser melting under the influence of ultrasonic vibrations of preplaced powder mixture. Detailed analysis of variation of clad layer thickness, microstructure in the composite clad layer, phase/texture development, surface roughness, and sliding wear performance with laser processing conditions is presented. The analysis showed that remelting and ultrasonic vibration assist results in significant improvement in clad layer thickness and microstructure (reduction in needle-like α-Si phase). While the laser remelting resulted in significant reduction in wear rate, the specimens processed with ultrasonic vibration-assisted laser melting showed variable wear rate, likely due to complex effects of microstructural modification and enhanced surface roughness.

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Section: Clad Layer Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Laser Remelting and Simultaneous Application of Ultrasonic Vibrations during Laser Melting on the Microstructural and Tribological Properties of Laser Clad Al-SiC Composites

2017

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“…To improve the grain refining efficiency of inoculation, many methods and strategies have been proposed, including chemical modification [3], rapid solidification [4][5][6][7][8], and ultrasonic processing [9], etc. Meanwhile, many theoretical and experimental investigations have aimed at revealing the procedure when inoculants are added to melts [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Grain Refining Behavior of In Situ CeB6/Al Composite Inoculant in Aluminum

Liu

Cui

Wang

et al. 2017

Metals

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Abstract:Melt spinning was performed to process an in situ CeB 6 /Al inoculant at different rotating speeds to investigate the influence of cooling rate on the grain refining behavior of inoculants. It has been found that a high cooling rate caused two obvious changes in the inoculant: the supersaturated solid solution of Ce in the α-Al matrix and the miniaturization of CeB 6 particles. At high cooling rates of~10 8 K/s, the Ce content is largely beyond the theoretical solid solubility of Ce in Al, and the size of the CeB 6 particles in ribbons is reduced to~100 nm. The grain refining effect of melt-spun CeB 6 /Al composite inoculant shows significant dependence on holding time of which the best value should be no more than 2 min. The excellent grain refinement of the inoculant can be attributed to the combined effect of the nano-sized refiner particles and the large undercooling caused by the sudden melting of supersaturated Al-Ce solution.

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“…The microstructural refinement of Mg alloys can be performed by two basic approaches: (i) thermomechanical treatment through plastic deformation in which dynamic recrystallization leads to the formation of small equiaxed grains [18]; (ii) casting processing where two different routes can be followed: chemical [19] or physical [20][21][22] treatment. An example of physical processing is the application of ultrasound treatment [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

Puga

Carneiro

Barbosa

et al. 2015

Metals

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The present study evaluates the effect of high-intensity ultrasound (US) in the static and dynamic mechanical behavior of AZ91D by microstructural modification. The characterization of samples revealed that US treatment promoted the refinement of dendrite cell size, reduced the thickness, and changed the β-Mg17Al12 intermetallic phase to a globular shape, promoted its uniform distribution along the grain boundaries and reduced the level of porosity. In addition to microstructure refinement, US treatment improved the alloy mechanical properties, namely the ultimate tensile strength (40.7%) and extension (150%) by comparison with values obtained for castings produced without US vibration. Moreover, it is suggested that the internal friction, enhanced by the reduction of grain size, is compensated by the homogenization of the secondary phase and reduction of porosity. It seems that by the use of US treatment, it is possible to enhance static mechanical properties without compromising the damping properties in AZ91D alloys.

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Grain refinement of AZ91 alloy by introducing ultrasonic vibration during solidification

Cited by 114 publications

References 7 publications

Effect of Laser Remelting and Simultaneous Application of Ultrasonic Vibrations during Laser Melting on the Microstructural and Tribological Properties of Laser Clad Al-SiC Composites

Effect of Laser Remelting and Simultaneous Application of Ultrasonic Vibrations during Laser Melting on the Microstructural and Tribological Properties of Laser Clad Al-SiC Composites

Effect of Cooling Rate on Microstructure and Grain Refining Behavior of In Situ CeB6/Al Composite Inoculant in Aluminum

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

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