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Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy
Jiang, Fuqing1,2,3; Huang, Jiwu1,4; Jiang, Yingge1; Xu, Chenglong1
Corresponding AuthorHuang, Jiwu(huangjw@csu.edu.cn)
2021-02-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume854Pages:11
AbstractTo provide insight to the relationships between quenching rate and aging treatment on the microstructure and properties of Al-Zn-Mg alloys, 7046 A alloy, a low Cu-content commercial Al-Zn-Mg alloy, was selected in the present study. As-received hot-extruded 7046 A alloys were quenched in air and room temperature water and then aged at 120 degrees C for 0-120 h. The mechanical behavior, corrosion resistance and microstructures of the aged alloy were compared and analyzed. The experiment result shows that quenching rate exhibits a greater influence on the precipitates and precipitation free zones (PFZs) of aged alloys than over-aging treatment and the reasons have been discussed. The eta equilibrium phases preferentially take the Al3Zr and Al6Mn dispersoids as the heterogeneous nucleation core and grow quickly inside the grains during the slow cooling process. Over-aging treatment would broaden the grain boundary PFZ and the space of grain boundary precipitates, thus improving the corrosion resistance of water quenched alloys, while it is harmful to air quenched (AQ) alloys. Pitting resistance can be summarized as: AQ24 < AQ120 < AQ60, WQ24 < WQ60 < WQ120. The yield strength, ultimate tensile strength, and elongation the T6 treated WQ alloys (similar to 120 degrees C/24 h) are similar to 532 MPa, similar to 568 MPa, similar to 12.4%, respectively; and the corresponding values of T6 treated AQ alloys (similar to 120 degrees C/60 h) are similar to 475 MPa, similar to 521 MPa, similar to 11.4%. Long-term over-aging (120 degrees C/120 h) has little effect on the hardness, while the tensile properties decrease by similar to 5-6% compared to T6 treatment. (C) 2020 Elsevier B.V. All rights reserved.
KeywordAl-Zn-Mg alloy Quenching rate Over-aging Microstructure Mechanical properties Corrosion resistance
Funding OrganizationScientific and Research Plan Program of Guangdong Province ; Key-Area Research and Development Program of Guangdong Province
DOI10.1016/j.jallcom.2020.157272
Indexed BySCI
Language英语
Funding ProjectScientific and Research Plan Program of Guangdong Province[2016B090931004] ; Key-Area Research and Development Program of Guangdong Province[2020B010186002]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000596245900004
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/158711
Collection中国科学院金属研究所
Corresponding AuthorHuang, Jiwu
Affiliation1.Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
4.Cent South Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Fuqing,Huang, Jiwu,Jiang, Yingge,et al. Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,854:11.
APA Jiang, Fuqing,Huang, Jiwu,Jiang, Yingge,&Xu, Chenglong.(2021).Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy.JOURNAL OF ALLOYS AND COMPOUNDS,854,11.
MLA Jiang, Fuqing,et al."Effects of quenching rate and over-aging on microstructures, mechanical properties and corrosion resistance of an Al-Zn-Mg (7046A) alloy".JOURNAL OF ALLOYS AND COMPOUNDS 854(2021):11.
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