Abstract
Studies were made on the effects of aging temperature and pre-strain on the stress corrosion cracking of ternary Al-Zn-Mg alloys containing 4.5wt.%Zn-3wt.%Mg, 4.5wt.%Zn-2wt.%Mg, and 4.5wt.%Zn-1wt.%Mg.The results obtained were summarized as follows:(1) The alloys aged at low temperature were sensitive to the stress corrosion cracking. The fact would be due to small proof stress and high corrosion rate. The alloys aged at temperatures higher than G. P. solvus were insensitive to the stress corrosion cracking.(2) When the aging temperature was higher, the alloy having lower content of additional elements promptly turned to be more insensitive to the stress corrosion cracking as compared with that of higher content.(3) The specimen as pre-strained was more sensitive to the stress corrosion cracking than that as no prestrained. The sensitivity was greater with the increase of pre-strain.
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