Investigation of Square Wave Pulsed Currents on Solidification Behavior of Al-Cu Alloys
Al-(4-5)%Cu alloy was served as experiment material，the effect of pulsed currents on the solidification structure was investigated. During the solidification process of Al-Cu alloys, pulsed currents was added into the melted alloy in the crucible .The change of temperature curve and microstructure about the alloy was investigated in such conditions by temperature-recording instrument and optical microscope.The results showed that pulsed currents can shorten the temperature region of crystallization and refine the grains of the alloy,which crush the dendrite and make the solidification structure non-dendrite, presenting columnar and equiaxed grains which are distributed evenly and whose space between crystals are reduced. This investigation firstly started to study the relations between the temperature region of crystallization and organization structure of solidification. Finally, the mechanism of metal solidification affected by square wave pulsed currents was discussed.
Guojun Zhang and Jessica Xu
X. T. Yang et al., "Investigation of Square Wave Pulsed Currents on Solidification Behavior of Al-Cu Alloys", Advanced Materials Research, Vols. 160-162, pp. 1767-1771, 2011