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

被引：19

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

页码：427 / 431

页数：5