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

Guo-jun Wang; Bai-qing Xiong; Yong-an Zhang; Zhi-hui Li; Pei-yue Li

doi:10.1016/S1674-4799(09)60075-3

Volume 16 Issue 4

Aug. 2009

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International Journal of Minerals, Metallurgy and Materials > 2009 > 16(4): 427-431. > DOI: 10.1016/S1674-4799(09)60075-3

Guo-jun Wang, Bai-qing Xiong, Yong-an Zhang, Zhi-hui Li, and Pei-yue Li, Microstructural characterization of as-cast and homogenized 2D70 aluminum alloy, Int. J. Miner. Metall. Mater., 16(2009), No. 4, pp.427-431. https://dx.doi.org/10.1016/S1674-4799(09)60075-3

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Materials

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

Guo-jun Wang^1,2), ,,
Bai-qing Xiong¹⁾,
Yong-an Zhang¹⁾,
Zhi-hui Li¹⁾ and
Pei-yue Li¹⁾

Author Affilications

State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China
Northeast Light Alloy Co., Ltd., Harbin 150060, China

Received: 18 August 2008; Available Online: 13 June 2021

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Abstract

Abstract

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 (Al₂CuMg, Al₂Cu, Al₉FeNi, Cu₂FeAl₇, and Al₇Cu₄Ni). After conventional homogenization, Al/Al₂CuMg eutectic phases are dissolved into the matrix, and a small amount of high melting-point eutectic Al/Al₂Cu phases exist in the matrix, resulting in an increase in the starting melting temperature. Under double homogenization, the high melting point Al/Al₂Cu phases are dissolved, and no obvious change is observed for the size and morphology of Al₉FeNi, Cu₂FeAl₇, and Al₇CuaNi compounds.
- aluminum alloys,
- microstructure,
- homogenization,
- intermetallics

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