The modification of liquid metal by electric pulse (EP) is a novel method for grain refinement. In this work, based on the reported structural heredity of EP-modified liquid aluminum, we investigated its viscosity change by using torsional oscillation viscometer. The results validate the viscosity of EP-modified liquid aluminum also decreases with increasing temperature and meets approximately exponential correlation on the whole. Moreover, it is especially important that the EP-modified liquid aluminum has the higher viscosity and possesses the bigger viscous-flow cluster in a certain temperature range, which should be associated with the increase of the order degree of its liquid structure. Differential scanning calorimetry (DSC) measurement also confirms that viewpoint. These coupling results experimentally testify the proposed mechanism of electric pulse modification (EPM) modeled merely by postulation.
[1]
L. Du,et al.
Strengthening Mechanism of a New 700 MPa Hot Rolled High Strength Steel
,
2008
.
[2]
A. Sprecher,et al.
Colony (grain) size reduction in eutectic Pb-Sn castings by electroplusing
,
1995
.
[3]
X. Bian,et al.
Fragility of superheated melts and glass-forming ability in Al-based alloys [rapid communication]
,
2005
.
[4]
Wang Jianzhong,et al.
Heredity of Aluminum Melt Caused by Electric Pulse Modification (I)
,
2007
.
[5]
K. Terashima,et al.
Variation of silicon melt viscosity with boron addition
,
2002
.