材料科学
延展性(地球科学)
微观结构
纳米结构
应变硬化指数
变形(气象学)
晶界
复合材料
冶金
纳米技术
蠕动
作者
Guodong Li,Jiaxi Jiang,Huachun Ma,Ruixiao Zheng,Si Gao,Shiteng Zhao,Chao Ma,Kei Ameyama,Bin Ding,Xiaoyan Li
出处
期刊:Acta Materialia
[Elsevier]
日期:2023-09-01
卷期号:256: 119143-119143
被引量:1
标识
DOI:10.1016/j.actamat.2023.119143
摘要
Heterogeneous microstructural design has been proven to be an effective strategy in breaking the strength–ductility dilemma in nanostructured metals. However, the precise control of heterogeneous microstructures to achieve strength–ductility synergy remains challenging. Here, we demonstrate a novel powder metallurgy approach for creating three-dimensional (3D) core–shell nanostructures with highly tunable shell thickness and grain size distributions. These 3D nanostructures enable superior strength–ductility synergy in pure copper, pushing the boundary of the Ashby map to unchartered territory. A combination of microstructural characterization, atomistic simulations and crystal plasticity modeling reveals that the generation and accumulation of geometrically necessary dislocations near the core–shell interface play a pivotal role in accommodating the strain gradient and sustaining a high strain-hardening rate during plastic deformation. Our work provides a viable approach for designing bulk nanostructured materials with 3D heterogeneous ingredients and demonstrates a promising pathway for the development of strong and ductile materials.
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