Cu Segregation around Metastable Phase in Al-Mg-Si Alloy with Cu
Cu Segregation around Metastable Phase in Al-Mg-Si Alloy with Cu
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DOI：
10.2320/matertrans.48.967
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发表时间：
2007-05
影响因子：
1.2
通讯作者：
K. Matsuda;D. Teguri;Tatsuo Sato;Y. Uetani;S. Ikeno
中科院分区：
文献类型：
--
作者：
K. Matsuda;D. Teguri;Tatsuo Sato;Y. Uetani;S. Ikeno
Cu distribution around Q'-phase in an Al-1.0mass% Mg 2 Si-0.5 mass% Cu alloy has been investigated by the analytical transmission electron microscope (TEM), energy-filtering TEM (EFTEM), and high angular annular dark field scanning TEM (HAADF-STEM) techniques in order to determine the effect of Cu on the precipitation of this alloy. Cu-segregation around rod-shaped precipitates in the sample aged at 523 K for 24 ks was confirmed by energy dispersive X-ray spectroscopy, elemental maps, and HAADF-STEM images. Cu-segregation was also detected from small precipitates, which show a hexagonal network with a lattice constant of 1.04 nm in their HRTEM images. Coarse rods show homogeneous distribution of Cu, and chemical composition is similar to that of coarse Q'- or Q-phase. Small precipitates less than 10 nm were also confirmed in as-quenched samples, and those precipitates seem to form during quenching.
