Microstructural characterization of as-cast and homogenized 2D70 aluminum alloy

被引：20
作者：
Wang, Guo-jun [1 ,2 ]
Xiong, Bai-qing [1 ]
Zhang, Yong-an [1 ]
Li, Zhi-hui [1 ]
Li, Pei-yue [1 ]
机构：
[1] Gen Res Inst Nonferrous Met, State Key Lab Fabricat & Proc Nonferrous Met, Beijing 100088, Peoples R China
[2] NE Light Alloy Co Ltd, Harbin 150060, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2009年 / 16卷 / 04期
关键词：
aluminum alloys; microstructure; homogenization; intermetallics;
D O I：
10.1016/S1674-4799(09)60075-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure of the as-cast 2D70 aluminum alloy and its evolution during homogenization were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis. The results indicate that the microstructure of the as-cast 2D70 aluminum alloy mainly consists of the dendritic network of aluminum solid solution and intermetallic compounds (Al(2)CuMg, Al(2)Cu, Al(9)FeNi, Cu(2)FeAl(7), and Al(7)Cu(4)Ni). After conventional homogenization, Al/Al(2)CuMg eutectic phases are dissolved into the matrix, and a small amount of high melting-point eutectic Al/Al(2)Cu phases exist in the matrix, resulting in an increase in the starting melting temperature. Under double homogenization, the high melting point Al/Al(2)Cu phases are dissolved, and no obvious change is observed for the size and morphology of Al(9)FeNi, Cu(2)FeAl(7), and Al(7)Cu(4)Ni compounds.
引用
收藏
页码：427 / 431
页数：5
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