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Addressing the strength-ductility trade-off in a cast al-li-cu alloy—Synergistic effect of Sc-alloying and optimized artificial ageing scheme

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Journal of Materials Science & Technology 2022年第1期96卷 212-225页

作者： Jinshuo Zhang Guohua Wu liang Zhang Xiaolong Zhang Chunchang Shi Xin Tong National Engineering Research Center of light alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science andEngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Innovation Institute for Materials Shanghai200444China

A dramatic improvement of strength and ductility of cast al-2.5li-1.5cu-1Zn-0.5Mg-0.15 Zr alloy was obtained by the collaboration of Sc-alloying and optimized ageing scheme.Joint and independent influence of Sc-alloying and different ageing temperatures were investigated.The results revealed that a substantial increase was realized in the hardness of Sc-containing alloy,and the ageing response time was only influenced by ageing temperature.Coarse and heterogeneousδ'(al_(3)li),wideδ'-precipitation free zones(δ'-PFZs),and a large amount of T_(1)(al_(2)culi)precipitates were observed in Sc-containing alloy aged at 175℃,which resulted in superior yield strength and poor elongation.The Sc-containing alloy obtained an excellent combination of ductility(elongation=8.2%)and tensile strength(ultimate strength=565 MPa)suffered to 150℃ ageing for 64 h.The increase in the elongation was mainly due to the combined effect of grain refining,much finerδ',and extremely narrowδ'-PFZs(al_(3)(Sc,Zr,li)composite particles and a large amount of S'(al_(2)cuMg)phase.However,the enhancement of the different ageing temperature(150℃ and 175℃)on the mechanical properties of the alloys without Sc addition was not obvious.

关键词： cast al-li-cu alloy δ’-PFZs Mechanical properties cu-containing phases Microstructure evolutions

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Effect of Ti content on microstructures and mechanical properties of cast al-2li-2cu-0.5Mg alloy

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China Foundry 2023年第3期20卷 179-188页

作者： You-jie Guo Dong-chen Yang liang Zhang Guo-hua Wu Yi-xiao Wang Pei-sen li Guang-xiao Ren liang-bin li Xun-man Xiong National Engineering Research Center of light alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanxi Jianghuai Heavy Industry Co. Ltd.Jincheng 048000ShanxiChina Jiangxi Ganfeng lithium Co. LtdXinyu 338004JiangxiChina

Ti is regarded as one of the promising grain refiners in cast al-li-cu alloys,but few research works have been done on its independent role.In this study,the effect of Ti on the microstructure evolution and mechanical properties of cast al-2li-2cu-0.5Mg base alloy was investigated.The results revealed that the grains can be prominently refined with the increase of Ti addition.After adding Ti,high density TiB_(2)-al_(3)Ti composite particles with a low lattice misfit form as heterogeneous nucleation sites for the α-al matrix.δ’(al3li) and T_(1)(al_(2)culi) precipitates that provide enhanced strength are dominated in the alloys after T6 aging treatment.The average size of both δ’ and half-width of δ’-precipitation free zone(PFZ) decreases gradually with the increase of Ti content.This is because the higher binding energy between Ti atoms and vacancies limits the diffusion efficiency of li atoms,and thus results in a higher ductility.Additionally,no nano-sized al_(3)Ti or core-shell structure of al_(3)(li,Ti) particles are found.The tensile property test results indicate that the al-2li-2cu-0.5Mg alloy achieves optimal properties after aging at 175 °C for 32 h when 0.15wt.% Ti is added.It exhibits a yield strength of 352±5 MPa,an ultimate tensile strength of 423±6 MPa,and an elongation of(3±0.4)%.These findings are expected to offer a reliable theoretical guidance for the industrial composition design of the al-li-cu series cast alloys.

关键词： cast al-li-cu alloy Ti content grain refiner mechanical property microstructure

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