Grain Refinement of Mg97Y2Cu1 Alloy Solidified with Pulsed Direct Current Magnetic Field

The influences of different pulse voltage, discharging frequency, pouring temperature and mold temperature on marostructure of Mg97Y2Cu1alloy under pulsed direct current magnetic field (PDCMF) were studied and the related mechanism was also discussed. The results show that grains of Mg97Y2Cu1alloy can be refined greatly by PDCMF treatment. Macrostructure of the alloy is changed from coarsened grains to complete fine equiaxed grains. When the pulse voltage is at 0-250V, grain size of the alloy decreases dramatically as pulse voltage increases. When the discharging frequency is at 1-10Hz, grain size of the alloy increases firstly, then decreases, and the turning point is 5 Hz. The change of grain size is not obvious, when the discharging frequency increases from 1 Hz to 5 Hz. When the discharging frequency reaches 10 Hz, the effect of grain refinement is the best. When the mold temperature is at 20-600°C or the pouring temperature is at 660-750°C, grain size of the alloy with PDCMF treatment decreases grossly with the increase of the mold temperature or the pouring temperature. The higher the pouring temperature or the mold temperature, the better the effect of grain refinement with PDCMF treatment.

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Effects of Compound Treatment of Pulsed Magnetic Field and Mechanical Vibration on Solidified Structure of Mg97Y2Cu1 Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1061-1062.17 ◽

2014 ◽

Vol 1061-1062 ◽

pp. 17-22

Author(s):

Hao Zhang ◽

Quan Zhou ◽

Sen Zhang

Keyword(s):

Magnetic Field ◽

Grain Size ◽

Volume Fraction ◽

Mechanical Vibration ◽

Mold Temperature ◽

Pulse Frequency ◽

Pulse Voltage ◽

Pulsed Magnetic Field ◽

Second Phase ◽

Pouring Temperature

The influences of different pulse voltage, pulse frequency, pouring temperature and mold temperature on solidified structure of Mg97Y2Cu1alloy reinforced by long-period ordered structure with compound treatment of pulsed magnetic field and mechanical vibration were studied. The results show that grains of the alloy can be refined greatly with compound treatment. Primary phase degrades from developed dendrites into rosette-shaped crystal. Distribution of second phase is more uniform and continuous, and its volume fraction increases. When the pulse voltage is at 0-280V or the pulse frequency is at 1-10Hz, grain size of the alloy decreases dramatically as pulse voltage or pulse frequency increases. When the pouring temperature is at 660-750°C or the mold temperature is at 20-600oC, grain size of the alloy with compound treatment decreases grossly with the increase of the pouring temperature or the mold temperature.

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Effect of Low-Voltage Pulsed Magnetic Field on Solidified Structure of Superalloy K4169

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.725 ◽

2013 ◽

Vol 423-426 ◽

pp. 725-729

Author(s):

Xiao Hua Xie ◽

Quan Zhou ◽

Cheng Bo Xiao ◽

Xin Tang

Keyword(s):

Magnetic Field ◽

Grain Size ◽

Low Voltage ◽

Pulse Frequency ◽

Pulse Voltage ◽

Experimental Results ◽

Pulsed Magnetic Field ◽

Equiaxed Grains ◽

Dendritic Structures ◽

Refinement Effect

Effects of different pulse voltage and frequency on solidified structure of superalloy K4169 under low-voltage pulsed magnetic field (LVPMF) were investigated in this paper, and the related mechanism was also discussed. The experimental results show that grain of superalloy K4169 can be refined greatly by LVPMF treatment during the course of solidification. Growth of dendrite is restrained and primary grain is changed from large dendrites to smaller equiaxed grains. When the pulse voltage is at 0-280V, grain size of the alloy decreases as pulse voltage increases, and primary dendrites are fractured from well-developed dendrites into fine equiaxed grains and non-dendritic structures. When the pulse frequency is at 0-5Hz, the increase of pulse frequency enhances the refinement effect of LVPMF processing. With the increase of the pulse frequency, grain size of the alloy increases.

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Effects of Low-Voltage Pulsed Magnetic Field and Pouring Temperature on Solidified Structure of Al-4.5%Cu Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.2139 ◽

2011 ◽

Vol 399-401 ◽

pp. 2139-2143

Author(s):

Quan Zhou ◽

Le Ping Chen ◽

Jian Yin

Keyword(s):

Magnetic Field ◽

Grain Size ◽

Low Voltage ◽

Structure Refinement ◽

Primary Phase ◽

Pulse Voltage ◽

Pulsed Magnetic Field ◽

Pouring Temperature ◽

Cu Alloy ◽

Spherical Crystals

The solidified structure refinement of Al-4.5%Cu under the action of low-voltage pulsed magnetic field (LVPMF) was investigated in the paper. The influences of different pulse voltage and pouring temperature on solidified structure of Al-4.5%Cu alloy were studied. The results show that solidified structure of Al-4.5%Cu alloy can be refined greatly by LVPMF processing. The dendrite growth is restrained and the microstructure is changed from larger dendrite grains to smaller nondendritic grains, and with certain parameters, the equiaxed, non-dendritic grains are gained in the alloy. With the increase of pulse voltage, grain size of the alloy decreases, and the primary phase degrades from developed dendrites into rose-like or spherical crystals. The decrease of pouring temperature enhances the refinement effect of LVPMF processing. With 150 V pulse magnetic field treatment, grain size of the alloy decreases, primary phase degrades and refines gradually with the decrease of pouring temperature.

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The origin of nuclei and the refinement mechanism for solidified superalloy IN718 under pulsed magnetic field

Journal of Materials Research ◽

10.1557/jmr.2009.0445 ◽

2009 ◽

Vol 24 (12) ◽

pp. 3689-3692 ◽

Cited By ~ 4

Author(s):

Xiaoping Ma ◽

Yingju Li ◽

Yuansheng Yang

Keyword(s):

Magnetic Field ◽

Grain Refinement ◽

Mold Wall ◽

Mold Temperature ◽

Experimental Results ◽

Pulsed Magnetic Field ◽

Mold Surface ◽

Refinement Mechanism ◽

Equiaxed Grains ◽

Refinement Effect

The grain refinement effect of a pulsed magnetic field on superalloy IN718 was investigated. The experimental results show that fine equiaxed grains are acquired under the pulsed magnetic field. The refinement effect of the pulsed magnetic field is affected by the mold temperature. And the mixed grains are found in the solidified microstructures under the pulsed magnetic field. The origin of nuclei under the pulsed magnetic field is from the mold wall because of the rough mold surface, the undercooling, and the melt vibration, which all contribute to the refinement of solidified grains.

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Effect of AC Magnetic Field on Solidified Structure and Mechanical Properties of Mg97Y2Cu1 Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1061-1062.561 ◽

2014 ◽

Vol 1061-1062 ◽

pp. 561-566

Author(s):

Sen Zhang ◽

Quan Zhou ◽

Hao Zhang

Keyword(s):

Magnetic Field ◽

Mechanical Properties ◽

Grain Size ◽

Turning Point ◽

Volume Fraction ◽

Mold Temperature ◽

Second Phase ◽

Ordered Structure ◽

Ac Magnetic Field ◽

Equiaxed Grains

The influences of different voltage and mold temperature on solidified structure and mechanical properties of Mg97Y2Cu1alloy reinforced by long-period ordered structure under AC magnetic field were studied. The results show that grains of Mg97Y2Cu1alloy can be refined by AC magnetic field treatment. Macrostructure of the alloy is changed from coarsened grains to complete fine equiaxed grains. The initial dendrites are broken and and they have a tendency to break into several fragments. The second phase becomes more continuous and uniform, its volume fraction increases. When the voltage is at 0~250V, grain size of the alloy decreases firstly, then increases, and the turning point is 200V. When the mold temperature is at 20-600°C, grain size of the alloy increases grossly with the increase of the mold temperature. The change law of mechanical properties of the alloy is opposite to the change law of grain size. When the voltage is 200V, the tensile strength and elongation of the alloy are increased by up to 16% and 47%, respectively, compared with the alloy in traditional condition.

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Grain Refinement of 6061 Alloy by Low-Voltage Pulsed Magnetic Field Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.2413 ◽

2013 ◽

Vol 652-654 ◽

pp. 2413-2417 ◽

Cited By ~ 1

Author(s):

Quan Zhou ◽

Yang Cao ◽

Le Ping Chen

Keyword(s):

Magnetic Field ◽

Grain Size ◽

Low Voltage ◽

Mold Temperature ◽

Primary Phase ◽

Pulse Voltage ◽

Pulsed Magnetic Field ◽

Magnetic Field Treatment ◽

Spherical Crystals ◽

Refinement Effect

The influences of different pulse voltage and mold temperature on solidified structure of 6061 alloy under low-voltage pulsed magnetic field (LVPMF) were studied. The results show that grain of 6061 alloy can be refined greatly by LVPMF treatment. The dendrite growth is restrained and the microstructure is changed from larger dendrite grains to smaller nondendritic grains. When the pulse voltage is at 0V-300V, grain size of the alloy decreases as pulse voltage increases, and the primary phase degrades from developed dendrites into rose-like or spherical crystals. When the mold temperature is at 20°C-600°C, the decrease of mold temperature enhances the refinement effect of LVPMF processing. With the decrease of the mold temperature, grain size of the alloy decreases.

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Grain Refinement of Superalloy K4169 with Low-Voltage Pulsed Magnetic Field Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.821-822.877 ◽

2013 ◽

Vol 821-822 ◽

pp. 877-882

Author(s):

Xiao Hua Xie ◽

Le Ping Chen ◽

Cheng Bo Xiao ◽

Xin Tang

Keyword(s):

Magnetic Field ◽

Low Voltage ◽

Mold Temperature ◽

Primary Phase ◽

Pulsed Magnetic Field ◽

Pouring Temperature ◽

Average Grain Size ◽

Magnetic Field Treatment ◽

Equiaxed Grains ◽

Refinement Effect

The influences of different pouring temperature and mold temperature on solidified structure of superalloy K4169 under low-voltage pulsed magnetic field (LVPMF) were investigated in the paper. The experimental results show that solidified structure of superalloy K4169 under LVPMF can be refined greatly with appropriate cooling rate of the alloy. The dendrite growth is restrained and the microstructure is changed from larger dendrite grains to smaller equiaxed grains. When the pouring temperature is at 1380 °C-1530 °C or the mold temperature is at 1000 °C-1300 °C, the increase of pouring temperature or mold temperature enhances the refinement effect of LVPMF processing. With the increase of the pouring temperature or the mold temperature, average grain size of the alloy decreases and the primary phase degrades from developed dendrites into equiaxed crystals under the LVPMF.

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Effects of Mechanical Vibration and Pouring Temperature on Solidified Structure of Superalloy K4169

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.842.332 ◽

2013 ◽

Vol 842 ◽

pp. 332-336 ◽

Cited By ~ 2

Author(s):

Xiao Hua Xie ◽

Le Ping Chen ◽

Cheng Bo Xiao ◽

Xin Tang

Keyword(s):

Grain Size ◽

Grain Refinement ◽

Vibration Amplitude ◽

Turning Point ◽

Mechanical Vibration ◽

Dendrite Growth ◽

Experimental Results ◽

Pouring Temperature ◽

Vibration Treatment ◽

Equiaxed Grains

The influences of different vibration amplitude and pouring temperature on solidified structure of superalloy K4169 under the action of mechanical vibration were investigated. The vibration amplitudes and pouring temperatures used were 1.5, 1.75 and 2 mm and 1380, 1430, 1480 and 1530°C, respectively. The experimental results show that application of mechanical vibration leads to increase in grain refinement and proportion of equiaxed grains of superalloy K4169. The dendrite growth is restrained and the microstructure is changed from well-developed dendrite grains to fine equiaxed grains. Grain size of the alloy decreases as vibration amplitude increases. With the increase of the pouring temperature, grain size of the alloy increases firstly, then decreases and the turning point is 1430°C. When the pouring temperature is 1380°C, grain size of the alloy with mechanical vibration treatment is the finest.

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