Author： Matsuda Kenji Uetani Yasuhiro Sato Tatsuo Ikeno Susumu
Publisher： Springer Publishing Company
ISSN： 1543-1940
Source： Metallurgical and Materials Transactions A, Vol.32, Iss.6, 2001-06, pp. : 1293-1299
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Abstract
The Q′ phase in an Al-1.0 mass pct Mg2Si-0.5 mass pct Cu alloy at a peak-aged condition of 523 K was observed by a high-resolution transmission electron microscope (HRTEM), in order to identify its structure and chemical composition, and was compared with the type-C precipitate in an Al-1.0 mass pct Mg2Si-0.4 mass pct Si alloy (the excess-Si alloy). The Q′ phase has similar features to the type-C precipitate, according to results of electron diffraction patterns and images taken by the HRTEM, that is, they have similar hexagonal crystal lattices (a = 1.04 nm and c = 0.405 nm) to each other. The type-C precipitate in the excess-Si alloy was the ternary Al-Mg-Si phase, and the Q′ phase was the quaternary Al-Mg-Si-Cu phase in the Al-Mg-Si-Cu alloy, as determined by energy-dispersive X-ray spectroscopic (EDS) analysis.
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