Hot cracking behavior of A206/1%Al2O3 aluminum base nanocomposite

被引：2
作者：
Li K. [1 ]
Wang Q. [1 ]
Zhou N.-G. [1 ]
Gao T. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Nanchang University
来源：
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | 2011年 / 31卷 / 02期
关键词：
A206 aluminum alloy; Grain refinement; Hot cracking behavior; Nanocomposite;
D O I：
10.3969/j.issn.1005-5053.2011.2.017
中图分类号：
学科分类号：
摘要：
A206 aluminum alloy is rarely used in critical applications because of its high propensity for hot cracking. A206/1% Al2O3 nanocomposite was prepared with ultrasonic dispersion method. The hot cracking susceptibility(HCS) was evaluated using constrained rod casting in a steel mold. And microstructure of the alloys was analyzed by Optical Microscopy(OM) and Scanning Electron Microscopy(SEM). It was observed that the grain structure of α-Al in A206 alloy was changed from large dendritic crystal to small equiaxed one and the grain size was decreased from 164 μm to 26 μm with addition of Al2O3 nanoparticles. In addition, large number of flake-like(Fe, Mn)-rich intermediate phases were formed and coarse CuAl2 phases were eliminated in A206/1% Al2O3 aluminum composite, which significantly decreases its HCS.
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页码：89 / 94
页数：5
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