The Influence of Electric Current Pulses on the Microstructure of Magnesium Alloy AZ91D

2005 ◽  
Vol 488-489 ◽  
pp. 201-204 ◽  
Author(s):  
Yuan Sheng Yang ◽  
Quan Zhou ◽  
Zhuang Qi Hu
Keyword(s):  
Magnesium Alloy ◽  
Electric Current ◽  
Microstructure Evolution ◽  
Nucleation Rate ◽  
Low Voltage ◽  
Az91d Alloy ◽  
Current Pulses ◽  
Alloy Az91d ◽  
Electric Current Pulses ◽  
Semi Solid

The microstructure evolution of magnesium alloy AZ91D solidified with different electric current pulses and cooling rates was investigated and a new method, Low-voltage Electric Current Pulses (LVECP), to produce semi-slurry magnesium alloy was developed in this paper. The experimental results showed that the electric current pulses during solidification changed morphology of dendrites and the equiaxed, non-dendritic grains formed. The size of the primary a-Mg particles in semi-solid AZ91D alloy and the sphericity of the particles decreased with increase of discharging the voltage and treating time of LVECP. The increase of the cooling rate during the solidification of AZ91D alloy with LVECP promoted the formation of finer a-Mg particles, but the value of the sphericity of the particles rised. The formation of equiaxed, nondendritic structure by LVECP might be attributed to the electric current pulses increase the nucleation rate, restrained growth of the dendrites, and made dendrite arms remelted during the solidification of AZ91D alloy.

Effect of Low-Voltage Electric Current Pulse on Semi-Solid Microstructure of Magnesium Alloy AZ91D

2011 ◽  
Vol 399-401 ◽  
pp. 1613-1619
Author(s):  
Quan Zhou ◽  
Le Ping Chen ◽  
Jian Yin
Keyword(s):  
Electric Current ◽  
Current Pulse ◽  
Low Voltage ◽  
Processing Parameters ◽  
Dynamic Factor ◽  
Semisolid Slurry ◽  
Az91d Alloy ◽  
Electric Current Pulse ◽  
Alloy Az91d ◽  
Semi Solid

The effect of discharging cycle, voltage, capacitance and time on solidified microstructure of semi-solid slurry of AZ91D alloy treated with Low-Voltage Electric Current Pulse(LVECP) was investigated in this paper. The experimental results show that primary grains of AZ91D alloy were refined apparently, the morphology dendrites of α-Mg were changed by electric current pulse and the nondendritic structure of semi-solid slurry of AZ91D alloy could be obtained with appropriate processing parameters. The decrease of discharging cycle and the increase of discharging voltage and time to prepare semisolid slurry by LVECP discharge promotes the formation of fine α-Mg grains. It is proposed that LVECP treatment created a new dynamic factor for nucleation so that the number of nuclei increased, which restrained the formation of large primary α-Mg dendrites and created a base to form spherical crystals of primary α-Mg. The stronger temperature fluctuation in the melt with many rosette primary α-Mg caused by LVECP discharge and the remelting of the secondary arm roots in the same time are the most important reasons for formation of spherical primary α-Mg grains.

Effect of electric current pulses on the recrystallization kinetics of copper

1988 ◽  
Vol 22 (2) ◽  
pp. 235-238 ◽  
Author(s):  
H. Conrad ◽  
N. Karam ◽  
S. Mannan ◽  
A.F. Sprecher
Keyword(s):  
Electric Current ◽  
Recrystallization Kinetics ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Kinetics Of

Effect of electric current pulses on solidification of immiscible alloys

2014 ◽  
Vol 132 ◽  
pp. 66-69 ◽  
Author(s):  
Hongxiang Jiang ◽  
Jiuzhou Zhao ◽  
Cuiping Wang ◽  
Xingjun Liu
Keyword(s):  
Electric Current ◽  
Immiscible Alloys ◽  
Current Pulses ◽  
Electric Current Pulses
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