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Quantitative Electron tomography for Accurate Measurement of precipitates Microstructure Parameters in Al–Cu–Li Alloys

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1882-1894页

作者： Shi-Yong Li Ruo-Han Shen Yu-tao He Cui-Lan Wu Jiang-Hua Chen Centre for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China College of Materials Science and Engineering Hainan UniversityHaikou 570228China

Mechanical theories show that properties of alloys are strongly dependent on the morphological parameters oftheir strengthening ***,accurate measurement of precipitates microstructure parameters is still a challenging *** this article,we develop a quantitative electron tomography method by combining computer vision technology to accurately characterize the three-dimensional microstructure parameters,such as volume fractions,sizes and distributions,of the t_(1) and δ’/θ’/δ’ precipitates in Al-Cu-Li(-Mg) *** they have extremely large aspect-ratios in shape and large numbers in density upon formation in the Al matrix,these thin plate-like precipitates are difficult to be characterized quantitatively without the assistance of computer vision *** is shown that the property difference between two peak-aged states of the alloy can be well explained with the quantitative precipitate parameters correctly *** these correct precipitate data,we also tested the validity of current mechanical models for projecting the contribution of precipitates to the strengths of the alloy,demonstrating that quantitative relations between strength and micro structure parameters still need to be refined.

关键词： Al–Cu–Li–Mg alloy t1 precipitate δ′/θ′/δ′composite precipitate Morphological parameters Electron tomography Computer vision

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Improvement of strength and ductility of Al-Cu-Li alloy through cryogenic rolling followed by aging

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transactions of Nonferrous Metals Society of China 2017年第9期27卷 1920-1927页

作者： Yan-jun DENG Guang-jie HUANG Ling-fei CAO Xiao-dong WU Li HUANG Ming-yong XIA Qing LIU College of Materials Science and Engineering Chongqing University Chongqing 400044 China

to develop an improved approach in achieving an excellent combination of high strength and ductility,the solutionized Al?Cu?Li plates were subjected to rolling at cryogenic and room temperatures,respectively,to a reduction of83%,followed by aging treatment at160°*** results indicate that Al?Cu?Li alloys through cryogenic rolling followed by aging treatment possess better mechanical *** at cryogenic temperature produces a high density of dislocations because of the suppression of dynamic recovery,which in turn promotes the precipitation of t1(Al2CuLi)precipitates during *** high density of t1precipitates enable effective dislocation pinning,leading to an increase in strength and *** contrast,room temperature rolled alloys after aging treatment exhibit lower strength and ductility due to low density of t1precipitates in the grain interior and high density of t1precipitates around subgrain boundaries.

关键词： Al-Cu-Li alloy cryogenic rolling dislocation t1 precipitate

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