Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 651, Issue -, Pages 991-998Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.11.050
Keywords
Al-Mg-Si alloy; Interrupted quenching; Pre-aging; Natural aging; Bake hardening response
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Funding
- International Science & Technology Cooperation Program of China [2014DFA51270]
- National Natural Science Foundation of China [51271209]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51421001]
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Thermal treatments such as pre-aging (PA) of Al-Mg-Si alloy sheet are important and necessary in the industrial production of automotive body panels. Interrupted quenching (IQ) treatments were investigated as a new strategy to improve the performance of Al-Mg-Si alloy during natural aging and paint-bake hardening. Direct comparisons were made to conventional pre-aging treatments for these alloys. The results show that IQ and PA treatments at 100 degrees C both suppress natural aging and promote precipitation of beta '' phase during paint baking. However, the 100 degrees C IQ process has the potential to reduce the time from 3 h to 45 min. The accelerated formation of Cluster(2) induced by the slow quenching rate is the main reason for high efficiency. IQtreatments at 170 degrees C produced less and coarser Cluster(2) which did not effectively improve the bake hardening response (BHR) after paint-bake cycle. The main disadvantage of IQ treatments is the precipitation of large quenching-induced precipitates and formation of precipitate-free zones (PFZ) at the grain boundaries which could decrease the fracture toughness of Al-Mg-Si alloys. (c) 2015 Elsevier B.V. All rights
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