THE STRESS CORROSION AND ROLE OF Mg SEGREGATED TO GRAIN BOUNDARY IN 7175 ALUMINIUM ALLOY

Acta Metall Sin

1997, Vol. 33

Issue (6): 595-601 DOI:

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THE STRESS CORROSION AND ROLE OF Mg SEGREGATED TO GRAIN BOUNDARY IN 7175 ALUMINIUM ALLOY

SONG Renguo; ZHANG Baojin; ZENG Meiguang(Northeastern University; Shenyang 110006)(State Key Laboratory of Solidification Processing; Northwestern PolytechnicalUniversity; Xi'an 710072)

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SONG Renguo; ZHANG Baojin; ZENG Meiguang(Northeastern University; Shenyang 110006)(State Key Laboratory of Solidification Processing; Northwestern PolytechnicalUniversity; Xi'an 710072). THE STRESS CORROSION AND ROLE OF Mg SEGREGATED TO GRAIN BOUNDARY IN 7175 ALUMINIUM ALLOY. Acta Metall Sin, 1997, 33(6): 595-601.

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Abstract Both the stress corrosion behavior of 7175 aluminium alloy in 3.5%NaCl solution and the composition of grain boundary were investigated by means of constantelongation rate testing(CERT) and energy spectra. The results indicated that the strength of140℃, 98 h aging state is slightly higher than that of 140℃, 16 h, and the property of stresscorrosion resistance for the former better than the latter. In addition, the concentration of Mgsegregated to grain boundary decreases with increasing aging time, and it is closely related tothe SCC susceptibility of alloy.

Key words: 7175 aluminium alloy stress corrosion grain boundary segregation hydrogen embrittlement anodic dissolution

Received: 18 June 1997

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1997/V33/I6/595

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