Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

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Influence of dual retrogression and re-aging temper on microstructure, strength and exfoliation corrosion behavior of Al−Zn−Mg−Cu alloy
PENG Guo-sheng, CHEN Kang-hua, CHEN Song-yi, FANG Hua-chan

State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:Influence of dual retrogression and re-aging (dual-RRA) temper on microstructure, strength and exfoliation corrosion (EC) behavior of Al−Zn−Mg−Cu 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 obtains coarser and sparser grain boundary precipitates (GBPs) as well as higher Cu 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.

 

Key words: aluminum alloy; retrogression and re-aging; microstructure; tensile properties; exfoliation corrosion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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