A Study on the Fading of Sr-Modified Al-Si0 Alloy

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A Study on the Fading of Sr-Modified Al-Si0 Alloy
Issue 2, (1995)
Published： 1995 ，
DOI：

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[1]鲁薇华,王汝耀.铝－硅合金锶变质作用衰退的研究[J].特种铸造及有色合金,1995(02):1-5.

A Study on the Fading of Sr-Modified Al-Si0 Alloy. [J]. Special Casting & Nonferrous Alloys (2).(1995)
[1]鲁薇华,王汝耀.铝－硅合金锶变质作用衰退的研究[J].特种铸造及有色合金,1995(02):1-5. DOI：

A Study on the Fading of Sr-Modified Al-Si0 Alloy. [J]. Special Casting & Nonferrous Alloys (2).(1995) DOI：

摘要

作者发现有些铝合金存在严重锶变质作用衰退现象，大约只能延续９０ｍｉｎ左右。锶变质作用衰退是锶氧化，锶含量降至临界值０．００３％～０．００４％以下引起的。至于锶氧化如此之快有待进一步探讨。

Abstract

Strontium is so far as known a semi-per-manent modifier for aluminium-silicon alloy

however the fading of Sr-modified Al-Si alloy was studied in laberatory and under industrial conditions.It has been found that the strontium fades considerably more quickly than expected in general. The lifetime of Sr-modified Al-Si alloy is about 60￣90 min

depending on the initial content of strontium in melt and the melt circumstances. The turbulence of melt and bubbling during degassing will make the strontium easily to faed

It appears that the strontium loss from the melt are primarily by oxidation that makes the Sr-content lowering dowm to a critical value 0.003%￣0.004%.The reason of such a qiuck fading would remain to be solved.