Effect of La2O3 in the Al-P-Ti-TiC-La2O3 modifier on primary silicon in hypereutectic Al-Si alloys
Effect of La2O3 in the Al-P-Ti-TiC-La2O3 modifier on primary silicon in hypereutectic Al-Si alloys
复制标题
Al-P-Ti-TiC-La2O3改性剂中La2O3对过共晶Al-Si合金中初生硅的影响
DOI：
10.1016/j.jallcom.2005.11.034
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发表时间：
2006-09-14
影响因子：
6.2
通讯作者：
Jiang, Q. C.
中科院分区：
文献类型：
--
作者：
Xu, C. L.;Wang, H. Y.;Jiang, Q. C.
研究了Al-P-Ti-TiC-La_2O_3变质剂中La_2O_3对初生硅的影响。结果表明，Al-P-Ti-TiC-U_2O_3变质剂中的La ~（3+）对初生硅的变质起着重要作用。根据本实验，当将含La_2O_3的改性剂添加到Al-20 wt.%时，Si合金在850 ℃时，变质剂中的La 2 O3发生分解（部分或全部）。Al-P-Ti-TiC-La 2 O 3改性剂在30 min保温时间时获得最小的初晶硅尺寸（约平均18 μ m），从30 min到90 min，初晶硅尺寸几乎不随保温时间的增加而变化。Si合金比改性Al-20 wt.%中的约9倍大（约平均18 μ m Si合金与Al-P-Ti-TiC-La 2 O3改性剂在30分钟的保温时间。作为比较，与未改性的Al-20 wt.% Si合金，改性Al-20 wt.%的布氏硬度值Al-P-Ti-TiC-La_2O_3变质剂在保温30 min时，Si合金的硬度提高了39%。(c)2005 Elsevier B. V.保留所有权利。
The effect of La2O3 in the Al-P-Ti-TiC-La2O3 modifier on primary silicon has been investigated. The results show that La,03 in the Al-P-Ti-TiC-U2O3 modifier play an important role in modifying primary silicon. According to the present experiment, when the modifier containing La2O3 was added to Al-20wt.% Si alloy at 850 degrees C, La2O3 in the modifier was decomposed (partly or completely). The minimum primary silicon size (approximately average 18 mu m) modified with Al-P-Ti-TiC-La2O3 modifier is obtained at the holding time of 30 min, and the primary silicon size hardly change with the increase in holding time from 30 to 90 min. Primary silicon size (approximately average 150 mu m) in unmodified Al-20 wt.% Si alloy is about nine times larger than that (approximately average 18 mu m) in modified Al-20 wt.% Si alloy with Al-P-Ti-TiC-La2O3 modifier at the holding time of 30 min. As compared with unmodified Al-20 wt.% Si alloy, the Brinell hardness value of modified Al-20 wt.% Si alloy with Al-P-Ti-TiC-La2O3 modifier at the holding time of 30 min is increased by 39%. (c) 2005 Elsevier B.V. All rights reserved.