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A hidden precipitation scenario of the theta'-phase in Al-Cu alloys
Zhou, L.1; Wu, C. L.1; Xie, P.1; Niu, F. J.1; Ming, W. Q.1; Du, K.2; Chen, J. H.1
Corresponding AuthorWu, C. L.(cuilanwu@hnu.edu.cn) ; Chen, J. H.(jhchen123@hnu.edu.cn)
2021-06-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume75Pages:126-138
AbstractAl-Cu binary alloys are important and interesting industry materials. Up to date, the formation mechanisms of the key strengthening precipitates, named theta'-phase, in the alloys are still controversial. Here, we report that for non-deformed bulk Al-Cu alloys the theta'-phase actually has its own direct precursors that can form only at elevated aging temperature (> ca. 200 degrees C). These high-temperature precursors have the same plate-like morphology as the theta'-phase precipitates but rather different structures. Atomic-resolution imaging reveals that they have a tetragonal structure with a = 0.405 nm and c = 1.213 nm, and an average composition of Al5-xCu1+ x (0 <= x <1), being fully coherent with the Al-lattice. This precursor phase may initiate with a composition of Al5Cu and evolve locally towards Al4Cu2 in composition, eventually leading to a consequent structural transformation into the theta'-phase (Al4Cu2=Al2Cu). There are evidences that because of their genetic links in structure, such a high-temperature precursor may transform to the theta'-phase without having to change their morphology and interface structure. Our study reveals a well-defined and previously hidden precipitation scenario for the theta'-phase to form in Al-Cu alloys at an elevated aging temperature. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordAlCu alloy Age-hardening Precipitation Electron microscopy
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China
DOI10.1016/j.jmst.2020.09.039
Indexed BySCI
Languageen
Funding ProjectNational Natural Science Foundation of China[51831004] ; National Natural Science Foundation of China[51801060] ; National Natural Science Foundation of China[51671082] ; National Natural Science Foundation of China[11427806] ; National Natural Science Foundation of China[51471067] ; National Key Research and Development Program of China[2016YFB0300801]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000640021600014
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162225
Collection中国科学院金属研究所
Corresponding AuthorWu, C. L.; Chen, J. H.
Affiliation1.Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhou, L.,Wu, C. L.,Xie, P.,et al. A hidden precipitation scenario of the theta'-phase in Al-Cu alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,75:126-138.
APA Zhou, L..,Wu, C. L..,Xie, P..,Niu, F. J..,Ming, W. Q..,...&Chen, J. H..(2021).A hidden precipitation scenario of the theta'-phase in Al-Cu alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,75,126-138.
MLA Zhou, L.,et al."A hidden precipitation scenario of the theta'-phase in Al-Cu alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 75(2021):126-138.
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