Effects of Regression Time on Mechanical and Intergranular Corrosion Properties of 7150 Aluminum Alloy

Zhu Zhenfeng; Liang Pengguang; Sun Youzheng; Liang Xiaoning

doi:10.15980/j.tzzz.2020.10.022

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Effects of Regression Time on Mechanical and Intergranular Corrosion Properties of 7150 Aluminum Alloy
Vol. 40, Issue 10, Pages: 1143-1146(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.10.022

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[1]祝贞凤,梁朋光,孙有政,梁晓宁.回归时间对7150铝合金力学和晶间腐蚀性能的影响[J].特种铸造及有色合金,2020,40(10):1143-1146.

Zhu Zhenfeng, Liang Pengguang, Sun Youzheng, et al. Effects of Regression Time on Mechanical and Intergranular Corrosion Properties of 7150 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 40(10):1143-1146(2020)
[1]祝贞凤,梁朋光,孙有政,梁晓宁.回归时间对7150铝合金力学和晶间腐蚀性能的影响[J].特种铸造及有色合金,2020,40(10):1143-1146. DOI： 10.15980/j.tzzz.2020.10.022.

Zhu Zhenfeng, Liang Pengguang, Sun Youzheng, et al. Effects of Regression Time on Mechanical and Intergranular Corrosion Properties of 7150 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 40(10):1143-1146(2020) DOI： 10.15980/j.tzzz.2020.10.022.

摘要

通过维氏硬度、电导率和室温拉伸、晶间腐蚀等试验

分析比较T6态和回归再时效处理（RRA）态7150铝合金的性能。借助光学显微镜和透射电镜

研究回归时间对RRA态7150铝合金微观组织的影响。结果表明

T6态的7150铝合金强度很高

但抗晶间腐蚀性很差。RRA态的7150合金随回归时间延长

抗晶间腐蚀性能增强

强度先升高后降低。当回归时间为1h时

晶内组织主要析出相为GP区

并伴有细小沉淀相η′

η′相分布较为均匀

约几个nm

晶界处析出相粗大且分布不连续

有明显无沉淀析出带。T6+185℃×1h+T6处理的7150铝合金既具有较高的强度

又具有较好的抗晶间腐蚀性

表现出最佳的综合性能。

Abstract

The properties of 7150 aluminum alloys in T6 and RRA states were analyzed by means of Vickers hardness test

conductivity test and tensile as well as intergranular corrosion testing.The effects of regression time on the microstructure of 7150 aluminum alloy in RRA state were investigated by optical microscopy（OM）and transmission electron microscopy（TEM）.The results show that the 7150 aluminum alloy presents higher strength with poor intergranular corrosion resistance.With the increase of regression time

the intergranular corrosion resistance of the 7150 alloy in RRA state is increased

while the strength is first increased and then decreased.When the regression time is 1 h

the main precipitate in the grain is GP area

accompanied with fine precipitateη′

which is distributed uniformly with the size of several nanometers.The precipitation phase at grain boundary is large and discontinuous with obviously precipitate free zone.The 7150 alloy treated at T6+185℃×1 h+T6 possesses both high strength and good intergranular corrosion resistance

presenting the optimal comprehensive performance.