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In high-performance AlCu(Li)Mg aluminum alloys, Guinier–Preston–Bagaryatsky zones frequently form upon thermal ageing and play an important role in hardening the alloys. Here we report a novel type of highly-symmetric Guinier–Preston–Bagaryatsky zones formed in a high Cu-content AlCuMg alloy. Using atomic-resolution electron microscopy and first-principles calculations, we precisely characterized...
The S-phase is one of the key strengthening precipitate phases in high-strength 2xxx (AlCuMg) aluminum alloys. Nonetheless, the crystal structure of the S-phase remains controversial, and therefore its physical properties are almost unknown. Using atomic-resolution imaging in electron microscopy and first-principles energy calculations, it was confirmed at last that the structure model proposed by...
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