极限晶粒晶格稳定性及相变2024年度工作总结

该课题 2024 年聚焦极限晶粒晶格稳定性及相变，由中科院金属研究所完成。建立 3 组可控制备平台，成功制备出 Ni、Cu、Fe-Ni 等面心立方及体心立方块体纳米晶，部分晶粒尺寸≤5nm。首次在体心立方金属中引入低能界面，晶粒尺寸 11nm 时晶界能低至 0.5J/m²，显著提升热稳定性。研究了电镀温度、电流密度等对晶界结构及性能的影响，实现拉伸强度与塑性同步提升，申请发明专利 2 项，经费执行合规，为极限晶粒金属应用提供关键技术支撑。This project, focusing on the lattice stability and phase transformation of extreme-grained metals, was completed by the Institute of Metal Research, Chinese Academy of Sciences (IMR, CAS) in 2024. Three sets of controllable preparation platforms were established, through which bulk nanocrystals of face-centered cubic (FCC) and body-centered cubic (BCC) metals including Ni, Cu, Fe-Ni were successfully synthesized, with some grain sizes ≤5 nm. Low-energy interfaces were introduced into BCC metals for the first time, and the grain boundary energy decreased to 0.5 J/m² when the grain size was 11 nm, which significantly improved the thermal stability of the materials. The effects of electroplating temperature, current density and other factors on grain boundary structures and properties were investigated, achieving simultaneous enhancement of tensile strength and ductility. Two invention patents have been filed, the project funds were used in full compliance with relevant regulations, and this work provides key technical support for the application of extreme-grained metals.

搜集汇总

背景与挑战

背景概述

该数据集总结了2024年在极限晶粒晶格稳定性及相变领域的研究进展，重点包括制备出晶粒尺寸≤5nm的Ni、Cu、Fe-Ni等块体纳米晶，首次在体心立方金属中引入低能界面（晶界能低至0.5J/m²），显著提升热稳定性，并通过调控电镀参数实现拉伸强度与塑性的同步提升，为极限晶粒金属应用提供了关键技术支撑。