Effects of P and Rare Earth Elements Compound Modification on the Morphology of Si Phase in Al-20Si Alloy

Jiang Jun; Liao Fujin; Hu Zhongpeng; Wang Liandeng; Zhu Dingyi; Zhu Fubin

doi:10.15980/j.tzzz.2017.12.029

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Effects of P and Rare Earth Elements Compound Modification on the Morphology of Si Phase in Al-20Si Alloy
Vol. 37, Issue 12, Pages: 1381-1384(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.12.029

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[1]江峻,廖福锦,胡钟鹏,王连登,朱定一,朱富斌.P与稀土复合变质对Al-20Si合金中Si相形貌的影响[J].特种铸造及有色合金,2017,37(12):1381-1384.

Jiang Jun, Liao Fujin, Hu Zhongpeng, et al. Effects of P and Rare Earth Elements Compound Modification on the Morphology of Si Phase in Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 37(12):1381-1384(2017)
[1]江峻,廖福锦,胡钟鹏,王连登,朱定一,朱富斌.P与稀土复合变质对Al-20Si合金中Si相形貌的影响[J].特种铸造及有色合金,2017,37(12):1381-1384. DOI： 10.15980/j.tzzz.2017.12.029.

Jiang Jun, Liao Fujin, Hu Zhongpeng, et al. Effects of P and Rare Earth Elements Compound Modification on the Morphology of Si Phase in Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 37(12):1381-1384(2017) DOI： 10.15980/j.tzzz.2017.12.029.

摘要

以Al-20Si合金为研究对象

添加Cu-P和Al-RE中间合金对其进行变质处理

采用SEM扫描电镜、X射线衍射仪和光学金相显微镜分析变质处理对合金中Si相形貌的影响。结果表明

P与Al反应生成AlP化合物

可以作为初生Si相的异质形核质点

显著细化初生Si

稀土吸附固溶在Si相的生长台阶

使Al-20Si合金中Si相的晶格常数增大

X射线衍射图谱发生小角度偏移;随着变质时间延长

合金中板条状的初生Si变得细小圆润

平均晶粒尺寸由85.6μm减小至13.2μm

共晶Si由长针状转变为短杆状

弥散分布在基体中

硬度（HB）由68.5提升至80.8。

Abstract

Cu-P master alloy and Al-RE master alloy were added into Al-20 Si alloy to understand influence of modification treatment on microstructure of the alloy by SEM

X-ray diffractometer and optical metallographic microscope.The experimental results reveal that the AlP phase can be generated by reaction of P and Al as the heterogeneous nuclei of the primary silicon phase to effectively refine the primary silicon in the alloy.The rare earth elements are adsorbed and dissolved into the growth step of the Si phase

resulting in the increase of lattice constant of Si phase in the Al-20 Si alloy and the shift of X-ray diffraction pattern with a small angle.With the increase of modification time

the average grain size of primary silicon is decreased from 85.6μm to 13.2μm.The eutectic silicon phase is changed from long needle to short rod shape with uniform distribution in the matrix.The hardness（HB）is increased from68.5 to 80.8.