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通过恒伸长速率试验和能谱分析，研究了7175铝合金在3．5％NaCl水溶液中的应力腐蚀行为及晶界的化学成分结果表明，7175铝合金在140℃，98h时效的强度较140℃，16h时效的强度略高，而且具有较好的抗应力腐蚀性能此外，晶界上Mg偏析浓度随着时效程度的增加而减小，且与合金的应力腐蚀敏感性密切相关
Through constant elongation rate test and energy spectrum analysis, the stress corrosion behavior of 7175 aluminum alloy in 3.5% NaCl aqueous solution and the chemical composition of the grain boundaries were studied. The results show that the strength of 7175 aluminum alloy at 140 ℃ for 98h is 140 ℃, 16h aging strength slightly higher, and has good resistance to stress corrosion In addition, the grain boundary Mg segregation concentration decreases with the degree of aging increases, and is closely related to the susceptibility to stress corrosion cracking