论文信息 - Effect of welding parameters on microstructure in the stir zone of FSW joints of aluminum die casting alloy

Effect of welding parameters on microstructure in the stir zone of FSW joints of aluminum die casting alloy

The effect of the welding speed and the rotation speed on the microstructure in the stir zone has been investigated by measuring the Si particle distribution in the ADC12 alloy. The stir zone has fine recrystallized grains without dendritic structures, and the eutectic Si was uniformly dispersed in the stir zone. The size of the Si particles was statistically determined in the stir zone using image processing. The number of finer Si particles, which is formed by stirring of the tool probe, increases during the FSW. Finer Si particles are distributed more in the bottom than in the other regions, though the size of the Si particles in the base metal is the same in all the regions. The size of the Si particles decreases with increasing welding speed. However, it is not significantly affected by the rotation speed.

[1] Young Gon Kim,et al. Weldability of High Strength Aluminum Alloys by Friction Stir Welding , 2000 .

[2] Hiroyuki Kokawa,et al. Microstructural evolution of 6063 aluminum during friction-stir welding , 1999 .

[3] Young Gon Kim,et al. Effect of Tool Plunging Downforce on Welding Temperature during FSW of ADC12 , 2003 .

[4] Young Gon Kim,et al. Three defect types in friction stir welding of aluminum die casting alloy , 2006 .

[5] Murray W. Mahoney,et al. Effects of friction stir welding on microstructure of 7075 aluminum , 1997 .

[6] K. Nogi,et al. Microstructure and mechanical properties of friction stir welded joints of AC4A cast aluminium alloy , 2004 .

[7] W. M. Thomas,et al. Friction stir process welds aluminium alloys : The process produces low-distortion, high-quality, low-cost welds on aluminium , 1996 .