Simultaneously improved the strength and ductility of cast Al-3Li-2Cu alloy by Ti addition and heat treatment

被引:7
作者
Shao, Lixiong [1 ,2 ]
Li, Xianfeng [1 ,2 ,3 ,4 ]
Wang, Zhiping [1 ,2 ]
Deng, Yaqi [1 ,2 ]
Gao, Zhiyong [1 ,5 ]
Xia, Cunjuan [1 ,2 ,3 ,4 ]
Wang, Haowei [1 ,2 ,3 ,4 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[3] Huaibei Normal Univ, Sch Phys, Huaibei 235000, Anhui, Peoples R China
[4] Huaibei Normal Univ, Elect Informat Coll, Huaibei 235000, Anhui, Peoples R China
[5] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
关键词
Al-Li-Cu alloy; Grain refinement; Mechanical properties; Precipitation behavior; Ti addition; PRECIPITATE-FREE ZONES; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; LI-CONTENT; AL-TI; MICROSTRUCTURE EVOLUTION; CU ALLOY; MG; SIZE;
D O I
10.1016/j.matchar.2024.113902
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work systematically investigated the impact of minor Ti addition and heat treatment on grain structure, precipitates, precipitate-free zone (PFZ), and the performance of the Al-3Li-2Cu alloy. Minor Ti addition significantly refines the as-cast alloy, leading to a transition from columnar grains to equiaxed grains. The primary Al3Ti phases, with a low mismatch (0.99%) to the matrix, act as heterogeneous nucleation sites for alpha-Al, while the presence of Ti solutes restricts grain growth. As a result, the average grain size can be refined to 35.2 mu m by adding 0.2 wt% Ti. Besides, minor Ti addition affects the corresponding precipitation behavior of the alloy. Detailed TEM observations reveal that the addition of Ti inhibits the growth of S'(Al3Li) precipitates and the accompanying S'-PFZ, which should be related to the interaction between Ti solutes and vacancies. Besides, reducing the aging temperature exerts a similar effect. Finally, the 0.2 wt% Ti-modified alloy exhibits excellent mechanical properties after aging at 175 degrees C for 8 h. It demonstrates a high yield strength (272 MPa), a high ultimate tensile strength (399 MPa), and an acceptable elongation (5.9%), which represent an increase of 8.8%, 34.8%, and 293.3%, respectively, compared to the alloy without Ti addition. The simultaneous improvement in strength and ductility is attributed to the presence of fine and equiaxed grains, high-density and homogenous S' precipitates, and a narrow S'-PFZ. In-depth discussions are provided to elucidate the underlying mechanisms governing the microstructure and mechanical properties.
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页数:20
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