通过原子制造制备高强高韧双相纳米结构Ta基金属玻璃

High-strength and malleable dual-phase nanostructured Ta-based metallic glass via atomic manufacturing

通过原子制造技术构建独特的纳米尺度结构可能是改善金属玻璃(MG)薄膜机械性能的有效途径.在此,我们使用脉冲激光沉积作为原子制造策略,制备了一种Ta基金属玻璃.TaNi MG具有小尺寸纳米晶体(1-4纳米)弥散在非晶基体上的双相纳米结构,因此在压缩过程中表现出7.99 GPa的超高屈服强度和15.87 GPa的高硬度,并伴有80%的大塑性.纳米晶体和MG基体之间的相互作用,导致了多个剪切带的形成,从而贡献了高塑性和强度.研究发现,原子制造方法有利于直接调控薄膜材料的微观结构和微观构型,并进一步优化其性能.这项工作为通过原子尺度的结构设计来打破金属材料的强度-塑性权衡提供了一个实用的方法.

Constructing unique nanoscale structures by atomic manufacturing techniques may be an effective route to improve the mechanical properties of metallic glass(MG)thin films(TFs).Here,using magnetron sputtering and pulsed laser deposition(PLD)as atomic manufacturing strategies,we prepared two types of Ta-based MG TFs with a dual-phase structure.It was found that the PLD-TF presents a finer na-nostructure of small-sized nanocrystalsα-Ta(1-4 nm)diffu-sely dispersed on amorphous matrixes,resulting in an ultra-high yield strength of 7.99 GPa and a high hardness of 15.87 GPa when compressed,accompanied with a large plas-ticity of 80%.The interaction between the nanocrystallines and the MG matrix leads to the formation of multiple shear bands,which contribute to the high plasticity and strength.These results indicate that the atomic manufacturing method is beneficial to directly regulating the microstructure and microconfiguration of TF materials,and further optimizing their performance.This work provides a practical approach to break the strength-plasticity trade-off dilemma in metallic materials through atomic-level structural design.