Influence of dual retrogression and re-aging temper on microstructure, strength and exfoliation corrosion behavior of AlaZnaMgaCu alloy

Influence of dual retrogression and re-aging (dual-RRA) temper on microstructure, strength and exfoliation corrosion (EC) behavior of AlaZnaMgaCu alloy was investigated by hardness measurements, tensile properties tests, exfoliation corrosion tests, transmission electron microscopy (TEM) and scannin...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2012-04, Vol.22 (4), p.803-809
Main Authors: PENG, Guo-sheng, CHEN, Kang-hua, CHEN, Song-yi, FANG, Hua-chan
Format: Article
Language:English
Subjects:
Equivalence
Exfoliation corrosion
Grain boundaries
Microstructure
Precipitates
Precipitation
Scanning electron microscopy
Strength
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Summary:Influence of dual retrogression and re-aging (dual-RRA) temper on microstructure, strength and exfoliation corrosion (EC) behavior of AlaZnaMgaCu alloy was investigated by hardness measurements, tensile properties tests, exfoliation corrosion tests, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) observation combined energy dispersive X-ray detector (EDX) analysis. Dual-RRA temper maintains the matrix precipitates (MPs) similar to RRA temper, meanwhile obtainsa14coarser and sparser grain boundary precipitates (GBPs) as well as highera14Cu and lower Zn content compared with T76 temper. Therefore, dual-RRA temper not only keeps strength equivalent to the RRA temper but also obtains higher EC resistance than T76 temper.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61248-X