Hypereutectic Al-17.5Si (wt pct) and Al-25Si (wt pct) alloys with various content of rare earth Er were prepared by conventional casting technique. The effect of Er on the microstructure and properties of the hypereutectic Al-Si alloys was investigated using optical microscopy, scanning electron microscopy as well as friction and wear tests. It was found that optimal amount of Er exists in modifying the hypereutectic Al-Si alloys. An appropriate addition of Er improved the anti-wear properties, and reduced the friction coefficient of the hypereutectic Al-Si alloys studied. The primary silicon crystals in the hypereutectic Al-Si alloys were refined with the suitable addition of Er element. The modification mechanism was also discussed in this paper.
GENG Peng-Fei
,
GAO Bei
,
ZHUANG Yan-Xin
,
LIU Kai-Hua
,
CHU Zhuang-Feng
. On the modification of hypereutectic Al-Si alloys using rare earth Er[J]. Acta Metallurgica Sinica (English Letters), 2010
, 23(5)
: 327
-333
.
DOI: 10.11890/1006-7191-105-327
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