Journal
SCRIPTA MATERIALIA
Volume 150, Issue -, Pages 13-17Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.02.017
Keywords
Al-Cu alloy; Precipitation; Aging; Electrostatic potential; Vacancy
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Funding
- National Basic Research Program of China [2012CB619506]
- Natural Science Foundation of China [51071177, 11475130, 11575131, 51474244]
- Program of the Ministry of Education in China via Collaborative Innovation Center of Advanced Non-ferrous Structural Materials and Manufacturing
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The effect of electrostatic potential (EP), specifically without current and Joule heating effect, on the precipitation in aluminum alloy during artificial aging (180 degrees C) was investigated via microhardness testing, transmission electron microscopy (TEM), positron annihilation spectroscopy (PAS), and measurements of vacancy formation enthalpy and vacancy migration enthalpy. The results elaborated that EP promoted the nucleation of solute clusters/ GP zones in the early stage during aging. After extended aging, highly dense fine precipitates were retained in Al matrix leading to an improved strength. EP-assisted artificial aging provides a new pathway to tailor the precipitation behavior in Al alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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