Yu Yang, Wei Yuhao, Song Yaoyao, Shou Haoge, He Liuyong
Center for Engineering and Technology, Huanghuai University, Zhumadian, 463000, China.
School of Computer Science, University of Sydney, Sydney, NSW, Australia.
Sci Rep. 2025 May 24;15(1):18066. doi: 10.1038/s41598-025-01805-6.
This study investigates the influence mechanisms of temperature on the tensile properties of Mg-Zn-Ca alloys, with a focus on the activation differences of slip systems at room temperature (RT) and high temperature (HT), and their effects on work hardening behavior. Observations using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) reveal that Mg-Zn-Ca alloy deformation predominantly relies on basal slip and partial pyramidal slip at RT. The decomposition of pyramidal <c + a> into basal <c + a> dislocations enhance dislocation interactions, which increases the work hardening rate and tensile strength. In contrast, more non-basal and multi-slip systems are activated at HT, reducing dislocation interactions and leading to a decrease in the work hardening rate. The HT samples exhibit lower tensile strength but higher elongation. This study reveals the regulatory mechanism of pyramidal <c + a> dislocation slip decomposition and dislocation interactions at different temperatures, providing a theoretical foundation for designing high-strength, high-ductility magnesium alloys.
本研究探究了温度对Mg-Zn-Ca合金拉伸性能的影响机制，重点关注室温（RT）和高温（HT）下滑移系的激活差异及其对加工硬化行为的影响。利用电子背散射衍射（EBSD）和透射电子显微镜（TEM）进行的观察表明，Mg-Zn-Ca合金在室温下的变形主要依赖于基面滑移和部分锥面滑移。锥面<c + a>分解为基面<c + a>位错增强了位错相互作用，从而提高了加工硬化率和拉伸强度。相比之下，高温下更多的非基面和多滑移系被激活，减少了位错相互作用，导致加工硬化率降低。高温样品的拉伸强度较低，但伸长率较高。本研究揭示了不同温度下锥面<c + a>位错滑移分解和位错相互作用的调控机制，为设计高强度、高延展性镁合金提供了理论基础。
