Effect of Si on the As-cast Microstructure of Cu-7.5Ni-5Sn Alloy

Liu Ruiqing; Yang Shengli; Wang Gang; Liao Yumin; Zhong Qiangqiang

doi:10.15980/j.tzzz.2014.03.008

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Effect of Si on the As-cast Microstructure of Cu-7.5Ni-5Sn Alloy
Vol. 34, Issue 3, Pages: 237-240(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.03.008

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[1]柳瑞清,杨胜利,王刚,廖钰敏,钟强强.Si对Cu-7.5Ni-5Sn合金铸态组织的影响[J].特种铸造及有色合金,2014,34(03):237-240.

Liu Ruiqing, Yang Shengli, Wang Gang, et al. Effect of Si on the As-cast Microstructure of Cu-7.5Ni-5Sn Alloy. [J]. Special Casting & Nonferrous Alloys 34(3):237-240(2014)
[1]柳瑞清,杨胜利,王刚,廖钰敏,钟强强.Si对Cu-7.5Ni-5Sn合金铸态组织的影响[J].特种铸造及有色合金,2014,34(03):237-240. DOI： 10.15980/j.tzzz.2014.03.008.

Liu Ruiqing, Yang Shengli, Wang Gang, et al. Effect of Si on the As-cast Microstructure of Cu-7.5Ni-5Sn Alloy. [J]. Special Casting & Nonferrous Alloys 34(3):237-240(2014) DOI： 10.15980/j.tzzz.2014.03.008.

摘要

利用金相显微分析、能谱分析、X射线衍射分析和SEM分析对添加Si的Cu-7.5Ni-5Sn合金的显微组织进行研究。结果表明

添加Si与未添加Si的Cu-7.5Ni-5Sn合金具有相同的组织。含Si的铸态Cu-7.5Ni-5Sn合金的组织由灰色的树枝晶（α基体）、过渡组织（α相和γ相两相的混合物）和枝晶间的骨状组织γ相（Cux Ni1-x）3Sn组成。Si对Cu-7.5Ni-5Sn合金具有细化枝晶的作用。Si与合金中的Ni形成Ni31Si12、Ni3Si和Ni74Si26相

其中起到细化变质作用的可能是Ni3Si相。添加Si可以延迟Cu-7.5Ni-5Sn合金的均匀化过程。

Abstract

Effects of Si addition on the microstructure of Cu-7.5Ni-5Sn alloy were investigated by metallographic test

energy spectrum

XRD（X-ray diffraction）and SEM（scanning electron microscope）analysis.The results show that the as-cast microstructure change of Cu-7.5Ni-5Sn alloy is absent regardless of adding Si

which is composed ofαdendrites structure

α+γand Sn-richγphases.The Si can refine the microstructure and grain size in Cu-7.5Ni-5Sn alloy.The Si can react with the Ni atoms and form Ni31 Si12 phase

Ni3 Si phase and Ni74 Si26 phase

and Ni3 Si phases can refine the dendritic structure.In addition

Si can delay the homogenization process of Cu-7.5Ni-5Sn alloy.