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자료유형
학술저널
저자정보
Wei Haigen (Central South University) Xia Fuzhong (Central South University) Jia Yanlin (Central South University) Wang Mingpu (Central South University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.4
발행연도
2016.1
수록면
642 - 648 (7page)

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Precipitate structures in Al-3Cu (wt%) and Al-3Cu-1.78Mg (wt%) alloys aged at 190 °C for 2 minutes were studied by transmission electron microscopy and high resolution transmission electron microscopy. New models named ordered structures were proposed for the fine precipitates formed in the two aged alloys. Ordered structures in Al-Cu alloys were composed by Al and Cu atoms, and by Al, Cu and Mg atoms together in Al-Cu-Mg alloys. By simulating selected area electron diffraction (SAED) patterns of Al-Cu-(Mg) alloys containing plate-shaped ordered structures and taking into account the influence of the plate shape of ordered structures on their electron diffraction characteristics, [001] zone axis SAED patterns of the two alloys were interpreted. It was concluded that volume expansions of the two aged alloys occurring at the early aging stage are caused by the lattice expansions as ordered structures are formed, and ordered structures are the nuclei for the GP zones in Al-Cu alloys.

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