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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第2期    总第306期    2020年2月

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文章编号:1672-7207(2020)02-0309-10
Cu质量分数对Al-1.0Mg-1.0Si-0.6Mn合金显微组织和性能的影响
刘名鑫1, 2,邓运来1, 3,张臻2, 3,唐建国1, 3

(1. 中南大学 材料科学与工程学院,湖南 长沙,410083;
2. 中南大学 轻合金研究院,湖南 长沙,410083;
3. 中南大学 高性能复杂制造国家重点实验室,湖南 长沙,410083
)

摘 要: 利用硬度测试、室温拉伸实验、晶间腐蚀实验、电化学腐蚀实验、SEM和TEM等方法,研究Cu质量分数对Al-1.0Mg-1.0Si-0.6Mn合金显微组织与性能的影响。研究结果表明:随着Al-1.0Mg-1.0Si-0.6Mn合金中Cu质量分数由0.01%逐渐增加至1.12%,其达到峰值时效所需时间逐渐减少,且峰值时效(T6态)硬度明显增加;随着Cu质量分数的增加,峰时效状态合金的抗拉强度由357.7 MPa逐渐增加至452.2 MPa,抗拉强度提升94.5 MPa,这是因为随着Cu质量分数增加,晶内析出相数量逐渐增多且尺寸逐渐减小,使得沉淀强化效果逐渐增强;Cu质量分数增加使粗大相AlFeMnSi的数量逐渐增加,腐蚀电流密度显著增大,合金的断后伸长率和抗晶间腐蚀性能呈下降趋势。

 

关键字: Cu质量分数;Al-1.0Mg-1.0Si-0.6Mn合金;抗拉强度;析出相;抗晶间腐蚀性能;粗大相

Effect of Cu mass fraction on microstructures and properties of Al-1.0Mg-1.0Si-0.6Mn alloys
LIU Mingxin1, 2, DENG Yunlai1, 3, ZHANG Zhen2, 3, TANG Jianguo1, 3

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Light Alloy Research Institute, Central South University, Changsha 410083, China;
3. State Key Laboratory of High Performance Complex Manufacturing, Central South University,Changsha 410083, China

Abstract:The effect of Cu mass fraction on the microstructures and properties of Al-1.0Mg-1.0Si-0.6Mn alloy was studied by means of hardness test, tensile test, intergranular corrosion test, electrochemical corrosion test, SEM and TEM. The results show that the time required to reach peak aging decreases gradually and the hardness in T6 status increases obviously with the increase of Cu mass fraction. The tensile strength increases from 357.7 MPa to 452.2 MPa, i. e. the strength increases by 94.5 MPa. The reason is that the number of precipitates in the alloys increases and the size of precipitates becomes smaller gradually with the increase of Cu mass fraction, which enhances the precipitation-strengthening effect. However, the number of the coarse phases such as AlFeMnSi increases gradually and the corrosion current density increases dramatically. The elongation rate after fracture and the intergranular corrosion resistance of the alloys show a descending trend.

 

Key words: Cu mass fraction; Al-1.0Mg-1.0Si-0.6Mn alloy; tensile strength; precipitated phase; intergranular corrosion resistance; coarse phase

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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