Microstructure and Interface Morphology of Cu-1.0Cr Alloy in the Non-steady Directional Solidification

Bi Xiaoqin1; Fu Hengzhi2

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Microstructure and Interface Morphology of Cu-1.0Cr Alloy in the Non-steady Directional Solidification
Vol. 29, Issue 3, Pages: 280-282(2009)
Published： 2009 ，
DOI：

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[1]毕晓勤,傅恒志.Cu-1.0Cr合金初始非稳态凝固与凝固界面形态选择[J].特种铸造及有色合金,2009,29(03):280-282+195-196.

Bi Xiaoqin1, Fu Hengzhi2. Microstructure and Interface Morphology of Cu-1.0Cr Alloy in the Non-steady Directional Solidification. [J]. Special Casting & Nonferrous Alloys 29(3):280-282(2009)
[1]毕晓勤,傅恒志.Cu-1.0Cr合金初始非稳态凝固与凝固界面形态选择[J].特种铸造及有色合金,2009,29(03):280-282+195-196. DOI：

Bi Xiaoqin1, Fu Hengzhi2. Microstructure and Interface Morphology of Cu-1.0Cr Alloy in the Non-steady Directional Solidification. [J]. Special Casting & Nonferrous Alloys 29(3):280-282(2009) DOI：

摘要

试验观察了Cu-1.0Cr合金初始非稳态凝固过程

探讨了初始非稳态凝固界面形态选择对稳态凝固组织形成产生的影响。结果表明

亚共晶Cu-1.0Cr合金初始非稳态定向凝固过程经历了平面状初生α相、完全（α+β）共晶组织以及枝晶状α相+（α+β）共晶组织的3个演变阶段。随着凝固速度增加

初始过渡区长度减小

非稳态凝固过程由两个过渡生长阶段:平面状初生α相生长阶段和完全（α+β）共晶组织生长阶段

变为一个过渡生长阶段:平面状初生α相生长阶段。初始非稳态凝固界面形态的选择决定了稳态凝固组织的构成。亚共晶Cu-Cr合金要获得完全的共晶组织

初始非稳态定向凝固过程中的组织生长必须保持平界面。

Abstract

Microstructure of Cu-1.0Cr alloy in the non-steady directional solidification were observed in directional solidification at different growth rates to understand effects of the interface morphology in an initial transient zone on the steady solidified structure.The results reveal that the microstructure evolution of hypoeutectic Cu-1.0Cr alloy undergoes three stages:the planar primary α phase

the whole eutectic（α+β）to the dendrite α phase +eutectic（α+β）phase.With the increase of growth rates

the microstructure evolution in an initial transient zone is transferred from two stages

consisting of the planar primary α phase and the whole eutectic（α+β）

into one stage

being the single planar primary α phase

which shows that steady solidification structure can be controlled by interface morphology in an initial transient zone.The hypoeutectic Cu-Cr alloy with the whole eutectic structure can be obtained if structure evolution in non-steady unidirectional solidification process keeps in the form of planar interface for the binary Cu-Cr eutectic series alloy.