Microstructure analysis of homogenized B93 aluminum alloy for aviation

被引：2

作者：

Jiang F. ^{[1
]}

Wei L.-L. ^{[1
]}

Jian H.-G. ^{[1
]}

Zheng X.-Y. ^{[1
]}

Huang H.-F. ^{[1
]}

Wen K. ^{[1
]}

机构：

[1] Department of Material Science and Engineering, Central South University

来源：

Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | 2010年 / 30卷 / 02期

关键词：

Al-Zn-Mg-Cu aluminum alloy; Homogenization; Microstructure;

D O I：

10.3969/j.issn.1005-5053.2010.2.001

中图分类号：

学科分类号：

摘要：

The as-cast microstructure of high-strength B93 aluminum alloy used in airplane structure and the evolvement of the microstructure during homogenization have been studied by optical microscopy (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Combined with the DSC curve of different conditions, the slender and narrow non-equilibrium phase enriched zones were found to re-dissolution first during the homogenization. When the homogenization temperature is below 350°C, the supersaturated solid solution decomposes, equilibrium phase η(MgZn2) precipitates and a spot of non-equilibrium low melting point eutectic phases in grain boundary dissolve. When the temperature is above 460°C, most of the intermetallic compound such as the η(MgZn2) phase, T(AlZnMgCu) phase dissolve back into the matrix, the dendritic network become sparse and the grain boundary become thinner. The Cu element segregates seriously in the ingot. With the homogenization temperature increasing, the continuous reticulation Cu grain boundary phase Al6(CuFe) dissolves and breaks. However, these phases do not dissolve completely. The optimum homogenization process of B93 aluminum alloy is 460°C for 24 h.

引用

页码：1 / 6

页数：5

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