Journal
MATERIALS CHARACTERIZATION
Volume 117, Issue -, Pages 47-56Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.04.014
Keywords
Aluminum alloy; Precipitation; In situ electrical resistivity measurement; Aging; Non-isothermal heat treatments
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Funding
- Research Fund for the Doctoral Program of Higher Education of China [20130161110007]
- National Natural Science Foundation of China [51574118]
- Chinese Scholarship Council [201306130021]
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In situ electrical resistivity monitoring technique was employed to continuously evaluate the precipitate evolution of an Al-Zn-Mg-Cu-based commercial alloy during typical artificial aging treatments. The effects of artificial aging on the precipitates stability during non-isothermal heat treatments were also explored. Conventional hardness test, transmission electron microscopy and differential scanning calorimetry were also adopted to verify the electrical resistivity results. The results indicated that both the precipitation process and its timely rate could be followed by the monitored electrical resistivity during artificial aging treatments. The electrical resistivity results gave overall information on continuous precipitation and dissolution processes, especially under high heating rates. Samples artificial aging heat treated at 120 degrees C for 24 h followed by aging at 150 degrees C for 24 h presented more stable state and coarser precipitates than the samples only artificial aging heat treated at 120 degrees C for 24 h or triple artificial aging heat treated at 120 degrees C/24 h + 195 degrees C/15 min + 120 degrees/24 h. While the incoherent eta precipitates in the samples artificial aging heat treated at 120 degrees C for 24 h followed by aging at 150 degrees C for 24 h were more easiness to coarsening and dissolve during non-isothermal heat treatments as well. Crown Copyright (C) 2016 Published by Elsevier Inc. All rights reserved.
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