Hierarchical structured Zn-Cu-Li alloy with high strength and ductility and its deformation mechanisms
Hierarchical structured Zn-Cu-Li alloy with high strength and ductility and its deformation mechanisms
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DOI：
10.1016/j.ijplas.2023.103731
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发表时间：
2023-08
影响因子：
9.8
通讯作者：
Xiyuan Zhang;Guisen Liu;Linfeng Jiang;Dian Jiao;Jimiao Jiang;Chun Chen;Zhiqiang Gao;Jialin Niu;G. Sha;Yao Shen;Hua Huang;G. Yuan
中科院分区：
文献类型：
--
作者：
Xiyuan Zhang;Guisen Liu;Linfeng Jiang;Dian Jiao;Jimiao Jiang;Chun Chen;Zhiqiang Gao;Jialin Niu;G. Sha;Yao Shen;Hua Huang;G. Yuan
Although Zn-based alloys exhibit great potential as biodegradable implants due to their moderate degradation rate and acceptable biocompatibility, the mechanical property is insufficient to meet medical applications. In this study, a Zn-2Cu-0.8Li (wt%) alloy with both high strength and high ductility is developed via a unique hierarchical structure. The alloy is composed of a hard micron-sizedβ-LiZn4matrix, a soft submicronη-Zn phase and dispersiveε-CuZn4nanoprecipitates. Theε-CuZn4nanoprecipitates grow along the specific direction and exhibit a coherent interface with the matrix. During the room-temperature tensile deformation, continuous dynamic recrystallization (CDRX) related to dislocation absorption and preferential misorientation increase near grain boundaries, as well as <c+a> dislocations, are observed. The excellent strength of the alloy is mainly attributed to the hardβ-LiZn4matrix with fine grains and the dispersiveε-CuZn4coherent nanoprecipitates.Simultaneously, favorable ductility is ensured by the deformable matrix with fine grains, and further improved by the activated CDRX, <c+a> slip and soft submicronη-Zn phase. Owing to the unique hierarchical microstructure, Zn-2Cu-0.8Li alloy exhibits a yield strength of 426.2 MPa, ultimate tensile strength of 472.2 MPa, uniform elongation of 43.7% and fracture elongation of 63.7%, showing great prospects for broader biomedical applications. This research proposes a significant strategy for the design of Zn alloys with excellent combination of high strength and ductility.
