Investigating the effects of pre-deformation and aging conditions on mechanical properties and SCC resistance of aluminium alloy 7075 via slow strain rate testing and electrochemical polarisation

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Engineering, Science and Technology Pub Date : 2022-09-29 DOI:10.1080/1478422X.2022.2127465

Kuang-Hua Hou, Li Hu, Cheng-Yueh Shih, Ching-Chang Yang

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引用次数: 1

Abstract

ABSTRACT In this study, the effects of pre-deformation on mechanical properties and stress corrosion cracking behaviour of 7075 alloy was investigated with SSRT and electrochemical polarization. The 10% pre-deformation substantially improves the SCC resistance of the 7075 alloys. The strain induced dislocations act as diffusion shortcuts and result in enhanced precipitation and early appearance of GBPs in the naturally aged 7075-T3. For artificial aging, pre-deformation causes rapid over-aging as larger precipitates are found in both matrix and GBs of the 7075-T8. The substitution of Cu for Zn in the GBPs and the larger GBPs acting as hydrogen traps are possible explanations for the improved SCC resistance of 7075-T8. Further improvements in SCC resistance can be found in the RRA treated 7075 alloys, while a more ductile behaviour can be seen in the pre-deformed 7075 alloy. Additionally, results of electrochemical testing are in high correlation with the SSRT results.

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通过慢应变速率试验和电化学极化研究预变形和时效条件对7075铝合金力学性能和抗SCC性能的影响

摘要本研究采用SSRT和电化学极化法研究了预变形对7075合金力学性能和应力腐蚀开裂行为的影响。10%的预变形显著提高了7075合金的抗SCC性能。应变诱导的位错起到扩散捷径的作用，并导致自然时效7075-T3中GBP的沉淀增强和早期出现。对于人工时效，预变形会导致快速过时效，因为在7075-T8的基体和晶界中都发现了较大的沉淀物。GBP中Cu代替Zn以及充当氢陷阱的较大GBP可能解释了7075-T8抗SCC性能的提高。在RRA处理的7075合金中可以发现耐SCC性的进一步改善，而在预变形的7075铝合金中可以看到更具延展性的行为。此外，电化学测试的结果与SSRT结果高度相关。

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.