期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 169, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2023.103731
关键词
Zn alloys; Microstructure; Mechanical property; Nanoprecipitate; Dynamic recrystallization
In this study, a Zn-2Cu-0.8Li alloy with both high strength and high ductility is developed via a unique hierarchical structure. The alloy consists of a hard beta-LiZn4 matrix, a soft eta-Zn phase, and dispersive epsilon-CuZn4 nanoprecipitates. The alloy exhibits excellent mechanical properties due to the unique microstructure and shows great potential for broader biomedical applications.
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 micronsized beta-LiZn4 matrix, a soft submicron eta-Zn phase and dispersive epsilon-CuZn4 nanoprecipitates. The epsilon-CuZn4 nanoprecipitates 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 hard beta-LiZn4 matrix with fine grains and the dispersive epsilon-CuZn4 coherent 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 submicron eta-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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据