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Study on the microstructure and age hardening capability in Al-Cu-Li alloys with different Cu/Li ratio
Ma, Juan1; Liu, Xiaochun2; Yan, Desheng3; Rong, Lijian3
Corresponding AuthorMa, Juan(442319994@qq.com)
2022-07-27
Source PublicationINTERNATIONAL JOURNAL OF MATERIALS RESEARCH
ISSN1862-5282
Volume113Issue:7Pages:671-681
AbstractThe microstructural evolution during natural ageing and artificial ageing treatment has been quantified in Al-Cu-Li alloys with Cu/Li ratios of 2.3 and 3.9. Methods including various ageing, hardness testing, transmission electron microscopy and differential scanning calorimetry were employed. The precipitation of T1 (Al2CuLi) phase was confirmed for the first time in the high Li content alloy under natural ageing treatment for 5 months, while the Li-lean alloy exhibits barely any precipitation at room temperature. Under artificial ageing, the Li-rich alloy exhibits a significant increase in hardness due to the formation of high density spherical delta ' phase. On the other hand, the increasing Cu/Li ratio promotes the precipitation of the Cu containing precipitates T1 and theta (Al2Cu), the high Cu/Li ratio (3.9) alloy shows a recovery of ductility, with a uniform elongation of similar to 20 %, which is caused by the strong interactions between the dislocations and the nano-scale T1 and theta precipitates. Meanwhile, as the main strengthening precipitate changes from theta and T1 to T1 alone with prolonged ageing time, the alloy displays a double-peak age hardening behavior. This work sheds light on the design of high strength and ductile Al-Li alloys through the well-controlled T1 phase precipitation.
KeywordAgeing Al-Li alloy Cu Li ratio Precipitation hardening
DOI10.1515/ijmr-2021-8626
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000813852300001
PublisherWALTER DE GRUYTER GMBH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174993
Collection中国科学院金属研究所
Corresponding AuthorMa, Juan
Affiliation1.Chengdu Univ, 2025 Chengluo Rd, Chengdu 610106, Sichuan, Peoples R China
2.Changsha Univ Sci & Technol, Inst Met, Coll Mat Sci & Engn, Changsha, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang, Peoples R China
Recommended Citation
GB/T 7714
Ma, Juan,Liu, Xiaochun,Yan, Desheng,et al. Study on the microstructure and age hardening capability in Al-Cu-Li alloys with different Cu/Li ratio[J]. INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,2022,113(7):671-681.
APA Ma, Juan,Liu, Xiaochun,Yan, Desheng,&Rong, Lijian.(2022).Study on the microstructure and age hardening capability in Al-Cu-Li alloys with different Cu/Li ratio.INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,113(7),671-681.
MLA Ma, Juan,et al."Study on the microstructure and age hardening capability in Al-Cu-Li alloys with different Cu/Li ratio".INTERNATIONAL JOURNAL OF MATERIALS RESEARCH 113.7(2022):671-681.
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