Melt Treatment and In-situ SiC in Al-20Si Alloy

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Melt Treatment and In-situ SiC in Al-20Si Alloy
Vol. 30, Issue 11, Pages: 1043-1045(2010)
Published： 2010 ，
DOI：

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[1]宋绍峰,马幼平,李秀兰,卢绍龙.Al-20Si合金熔体处理及内生SiC的研究[J].特种铸造及有色合金,2010,30(11):1043-1045+977-978.

Melt Treatment and In-situ SiC in Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 30(11):1043-1045(2010)
[1]宋绍峰,马幼平,李秀兰,卢绍龙.Al-20Si合金熔体处理及内生SiC的研究[J].特种铸造及有色合金,2010,30(11):1043-1045+977-978. DOI：

Melt Treatment and In-situ SiC in Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 30(11):1043-1045(2010) DOI：

摘要

采用石墨坩埚熔炼Al-20Si合金

以PM（磷盐）作为变质剂

对熔体处理及熔体反应内生SiC进行了探讨。结果表明

随保温时间增加

初晶Si晶粒尺寸逐渐变细

保温时间为0、1、3、6min时

其晶粒尺寸分别为18、15、12、9μm;SiC是高温活性C原子和过共晶Al-20Si合金反应的最终产物;凝固过程中反应生成的SiC颗粒一部分团聚在Si原子集团周围

充当初晶Si的异质形核基底

另一部分溶入初晶Si和基体。

Abstract

Melt treatment and in-situ SiC in the Al-20Si alloy were investigated by smelting Al-20Si alloy in graphite crucible and taking phosphate as modifier.The results reveal that with increasing in holding time

grain size of primary phase is gradually refined

where holding time is 0

6min

grain sizes are 18

9μm

respectively.SiC is resulted from the reaction of C atom and hypereutectic Al-Si alloy.One part of generated SiC particle in solidification process act as heterogeneous nuclei of primary Si by agglomerating around Si colony

the other is dissolved into the primary Si phase and matrix.