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1,绪言铝—镁合金具有良好的耐蚀性和焊接性,目前含低于5％镁的合金作为结构用合金,实际上得到了广泛应用。此种合金随含镁量增加强度也增加,但是容易引起应力腐蚀裂纹,这成为提高机械性能中的一个障碍。此种合金的应力腐蚀破裂归因于晶界析出的电位,负电位β(AI_3Mg_2)相局部溶解。作者们在前面报导中,讨论了此种合金应力腐蚀敏感性与显微组织的关联性,明确了晶界β相优先析出其间隔最小时
INTRODUCTION Aluminum-magnesium alloys have good corrosion resistance and weldability. Currently, alloys containing less than 5% magnesium have been widely used as structural alloys. Such alloys increase in strength with increasing magnesium content, but easily lead to stress corrosion cracking, which has become an obstacle to improve the mechanical properties. The stress corrosion cracking of this alloy is attributed to the potential of grain boundary precipitation, and the negative potential β (AI_3Mg_2) phase is partially dissolved. In the previous report, the authors discussed the association of stress corrosion susceptibility and microstructure of this alloy, clarifying that the grain boundary β phase preferentially precipitates at its smallest intervals