Microstructural Characterization of the As-Cast and Homogenized Al-Cu-Mg-Ag Alloy

被引：6

作者：

Lin, Haitao ^{[1
]}

Zhu, Kai ^{[2
,3
,4
]}

Liu, Qilong ^{[2
,3
,4
]}

Chen, Lifang ^{[1
]}

Wang, Zhengan ^{[1
]}

Li, Xiwu ^{[2
,3
,4
]}

机构：

[1] Southwest Aluminum Grp Co Ltd, Chongqing 401326, Peoples R China

[2] GRINM Grp Co Ltd, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China

[3] GRIMAT Engn Inst Co Ltd, Beijing 101407, Peoples R China

[4] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 01期

基金：

国家重点研发计划;

关键词：

Al-Cu-Mg-Ag heat-resistant aluminum; as-cast and homogenized microstructure; dendritic segregation; large-scale industrialized ingot;

D O I：

10.3390/ma16010433

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the as-cast microstructure and the evolution of the homogenized microstructure of large-scale industrialized Al-Cu-Mg-Ag heat-resistant aluminum alloy ingots were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive analysis (EDS), and differential scanning calorimetry (DSC). The results indicate that the dendritic segregation is evident in the ingot along the radial direction, and the grain boundaries are decorated with lots of net-shaped continuous eutectic structures. With the homogenization time extension and the homogenization temperature increase, the eutectic phases (i.e., the primary Al2Cu phase, the Al2CuMg phase, and the AlCuMgAg quaternary phase) at the grain boundaries gradually dissolve back into the matrix. Meanwhile, most of the dendritic grain boundaries gradually become sparse and thinner. Finally, it is found that the optimal homogenization regime of the Al-Cu-Mg-Ag alloy is 420 degrees C/5 h+480 degrees C/8 h+515 degrees C/24 h.

引用

页数：10

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