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Rare Metals

02.04.2019

Comprehensive tensile properties improved by deep cryogenic treatment prior to aging in friction-stir-welded 2198 Al–Li alloy

verfasst von: Jian-Qiu Sun, Yue Ma, Chong Gao, Hong-Yun Luo

Erschienen in: Rare Metals

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Abstract

In order to improve the comprehensive mechanical properties, deep cryogenic treatment (DCT) prior to aging was carried out on friction-stir-welded (FSW) 2198 Al–Li alloy; afterward, the microstructure and tensile properties were characterized by means of optical microscopy (OM), transmission electron microscopy (TEM) and tensile testing. The results show that FSW 2198 alloy through DCT prior to aging (DAT) possesses superior tensile properties than conventional aging treatment (AT). The microstructural analysis reveals that DAT alloy exhibits a finer grain structure, since DCT might effectively alleviate the residual stress in FSW 2198 alloy and thus decrease the driving force for grain coarsening in subsequent aging process. Moreover, DCT generates dislocation multiplication, which provides more preferential nucleation sites for T1 (Al₂CuLi) phase during subsequent aging treatment, resulting in high-density fine T1 phases and thin precipitate-free zone within DAT alloy. Such reasonable microstructure leads to DAT alloy possessing better strength-ductility combination compared to AT alloy.

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Titel: Comprehensive tensile properties improved by deep cryogenic treatment prior to aging in friction-stir-welded 2198 Al–Li alloy
verfasst von: Jian-Qiu Sun
Yue Ma
Chong Gao
Hong-Yun Luo
Publikationsdatum: 02.04.2019
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-019-01214-5

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