Microstructural Evolution of As-cast and Homogenized 2D70 Aluminum Alloy

Wang Guojun1; Xiong Baiqing1; Zhang Yong’an1; Li Zhihui1; Li Peiyue1

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Microstructural Evolution of As-cast and Homogenized 2D70 Aluminum Alloy
Vol. 29, Issue 6, Pages: 560-563(2009)
Published： 2009 ，
DOI：

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[1]王国军,熊柏青,张永安,李志辉,李培跃.2D70铝合金铸态及均匀化态的显微组织演变[J].特种铸造及有色合金,2009,29(06):560-563+488.

Wang Guojun1, Xiong Baiqing1, Zhang Yong’an1, et al. Microstructural Evolution of As-cast and Homogenized 2D70 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):560-563(2009)
[1]王国军,熊柏青,张永安,李志辉,李培跃.2D70铝合金铸态及均匀化态的显微组织演变[J].特种铸造及有色合金,2009,29(06):560-563+488. DOI：

Wang Guojun1, Xiong Baiqing1, Zhang Yong’an1, et al. Microstructural Evolution of As-cast and Homogenized 2D70 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):560-563(2009) DOI：

摘要

采用金相显微镜（OM）、扫描电镜（SEM）、能谱分析（EDS）、X射线衍射物相分析（XRD）、差示量热法（DSC）等方法

研究了2D70铝合金铸态组织的相组成

对比观察了该合金铸态、常规均匀化态、高温均匀化态的显微组织。研究结果表明

该合金铸态组织由Al2CuMg、Al2Cu、Al9FeNi、Al7Cu2Fe、Al7Cu4Ni等相组成。DSC和XRD分析表明

单级均匀化处理后可使Al2CuMg基本熔入合金基体中

然而合金中仍存在部分高熔点共晶相

但其起始溶解温度已提高

这为双级均匀化创造了条件。合金铸锭经双级均匀化后高熔点的共晶相回溶的更充分。铸锭中的Al9FeNi、Al7Cu2Fe、Al7Cu4Ni等相在均匀化处理过程中基本不变。

Abstract

Phase constituent in as-cast microstructure and microstructure of the semi-continuous 2D70 aluminum alloy in as-cast

normal homogenization and high temperature homogenization were observed by optical microscope（OM）

SEM（scanning electron microscope）

EDS（energy dispersive spectrum）

XRD（X-ray diffraction）and DSC（differential scanning calorimetry）.The results reveal that as-cast microstructure of the alloy is composed of Al2CuMg

Al2Cu

Al9FeNi

Al7Cu2Fe

Al7Cu4Ni phase

presenting amounts of non-equilibrium eutectic phases.DSC and XRD analysis indicate that after one-step homogenization treatment

Al2CuMg phase can be dissolved into the alloy with the presence of some high melting point eutectic phase

and the initial melting temperature of Al2Cu phase is increased

which provides a base for two-stage homogenization treatment.Eutectic phase with melting point is fully dissolved into the alloy after two-sage homogenization treatment.In addition

change of Al9FeNi

Al7Cu2Fe

Al7Cu4Ni phase in the ingot is not observed during homogenization process.