Abstract
The purpose of this study is to clarify slurry-erosion mechanism of silicon particle reinforced aluminum alloy base in-situ composites. Using a series of specimens (pure Al, hypoeutectic of Al-7mass%Si, fully eutectic of Al-12.6mass%Si and hypereutectic of Al-20mass%Si, Al-30mass%Si and Al-40mass%Si), slurry erosion test was conducted for 1.26×105s (35h) at 293K under a constant slurry speed of 8.55m/s. Sand volume fraction of the slurry was changed from 5 to 40vol. %. After the slurry erosion test, amount of weight loss in the specimens was measured to clarify the slurry erosion behavior. The results obtained are as follows. (1) The amount of weight loss depended on strength of the specimens in whole range of sand concentration in the slurry for pure Al and hypoeutectic specimens. (2) And also, the amount of weight loss depend on the sand concentration in slurry and/or the Si concentration in the matrix of the alloy for fully eutectic and hypereutectic specimens. The hypoeutectic specimen showed high slurry-erosion resistance for lower sand volume fraction in the slurry, though the hypereutectic specimen for higher sand volume fraction in the slurry. (3) Therefore, it is important to understand that the slurry erosion behavior depends on a combination of the microstructure of materials and the environmental condition such as sand concentration in the slurry.
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