Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 624, Issue -, Pages 22-26Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.10.208
Keywords
Metals and alloys; Precipitation; T-1-phase; Phase transitions; TEM; Atomic scale structure
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Funding
- National Basic Research (973) Program of China [2009CB623704]
- National Natural Science Foundation of China [51301064, 51471067, 11427806]
- Instrumental Innovation Foundation of Hunan Province [2011TT1003]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Aid Program for Young Teachers at Hunan University [531107040548]
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The formation mechanism of the plate-like strengthening T-1-phase in an Al-4.15Cu-1.15Li (wt.%) alloy has been revealed by means of advanced imaging techniques and the first-principle calculations. It is shown that T-1-precipitates nucleate directly from their own GP(T1) zones and grow thicker in two possible paths. One is regular by repeating T-1-cells, and the other is abnormal via T-1-variants. Structural model of GP(T1) zones has been suggested, and refined by image simulation. A possible structural evolution from GP(T1) zones to precipitate T-1 at atomic level is suggested and proved to be energetically reasonable. (C) 2014 Elsevier B.V. All rights reserved.
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