【摘要】 Al-Si合金的加Sr变质工艺已从实验室进入实际生产应用,但增氢问题是Sr变质的主要缺点。本文探讨了Sr变质Al-Si合金增氢的原因,发现这些氢不是由于变质处理过程中Al-Sr中间合金与大气中水汽反应而产生的,而是Al-Sr中间合金本身含有大量的氢。质谱分析结果表明,Al-Sr中间合金中存有SrH化合物。各种精炼方法的比较试验表明,对Sr变质处理后的ZL102合金用多孔吹头通工业氩气精炼,除氢效果明显,对变质有效期影响较小,是一种较理想的精炼方法。更多还原

【Abstract】 AbstractThe Technique of the modification of Al-Si alloys with Sr has Come into Commercial use.But the hydrogen pick-up in an Al-Si alloy modified with Sr is still amain problem to be solved.In this paper, the cause of the hydrogen pick-up has been investigated. Sr promote hydrogen pick-up in the melt because of the high hydrogen content of the Al-Sr mester alloy, in which a compound srH was found by meams of mass spectrogr-aphic analysis.Degassing studies formed another part of this investigation.As degassing agents, com-mecial Ar and N2 were used.These were bubbled into the melt through a holey blower. It is Suggested that commercial Ar is an effective degassing agent for Sr modified alloys.更多还原