赵娟刚,李飞,罗钦文,桑建权,刘春泉,何舒旋,王贵婷,刘志义

• 1:湖南工学院材料科学与工程学院
• 2:中南大学材料科学与工程学院

摘要(Abstract)：

采用万能拉伸试验机、浸泡腐蚀试验和电化学测试等研究了经不同工艺时效处理(T6、四级时效、三级时效和T73)后Al-Zn-Mg-Cu合金的力学性能和耐腐蚀性能,采用扫描电镜和透射电镜观察了不同时效态合金的微观组织,并对相关机理进行了分析。结果表明:经100℃×24h+170℃×4h+水淬+自然时效×24h+80℃×34h四级时效处理后,合金具有最优的综合性能,抗拉强度为627MPa,屈服强度为565MPa,伸长率为10.9%;120℃热暴露500h后合金的抗拉强度仅下降了4.94%,屈服强度仅下降了4.78%;四级时效处理后合金的自腐蚀电流密度为17.29μA·cm~(-2),自腐蚀电位为-730mV,与T6时效处理的合金相比,耐腐蚀性能略有提高,但与三级时效和T73时效处理的合金相比有所降低,T73时效处理的合金耐腐蚀性能最好。该时效态合金具有优良的拉伸强度与热稳定性的原因在于,在回归处理之后加入的24h自然时效期间,Mg原子与空位相结合形成了Mg-空位结合体,从而在再时效阶段析出了更多的G·P区强化相,最终提高了合金的强度。

关键词(KeyWords)： Al-Zn-Mg-Cu合金;热稳定性;微观组织;G·P区

Abstract:

Keywords:

基金项目(Foundation): 湖南省自然科学基金(2023JJ50114);; 湖南省应用特色学科材料科学与工程学科(湘教通[2022]351号);; 湖南省应用特色学科开放基金项目(KFB23008);; 2023年湖南省大学生创新创业训练计划项目(S202311528007);; 湖南工学院大学生创新训练中心入驻项目(2022EP16C)

作者(Author): 赵娟刚,李飞,罗钦文,桑建权,刘春泉,何舒旋,王贵婷,刘志义

DOI: 10.13289/j.issn.1009-6264.2024-0080

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