Maintaining Grain Boundary Segregation-Induced Strengthening Effect in Extremely Fine Nanograined Metals

被引：0
|
作者：
Qian, Lei [1 ,2 ]
Zhang, Jiacheng [1 ]
Yang, Wenqing [1 ]
Wang, Yunjiang [3 ]
Chan, Kangcheung [1 ]
Yang, Xu-Sheng [1 ,2 ]
机构：
[1] Hong Kong Polytech Univ, Res Inst Adv Mfg, Dept Ind & Syst Engn, Hong Kong 999077, Peoples R China
[2] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518060, Peoples R China
[3] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China
来源：
NANO LETTERS | 2025年 / 25卷 / 13期
关键词：
Grain boundary segregation; amorphous grain boundary; extremely fine grain size; deformation mechanism; strengthening effect; PLASTIC-DEFORMATION; COMPLEXION FORMATION; MECHANICAL-BEHAVIOR; ZR; STABILITY; SIZE; EVOLUTION; FILMS;
D O I：
10.1021/acs.nanolett.5c01032
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Reinforcing grain boundaries through solute segregation is a promising strategy to strengthen nanograined metals. However, maintaining strengthening in extremely fine nanograined metals poses challenges due to grain size reduction and grain boundary structural changes from excessive segregation. This study employs hybrid Monte Carlo/Molecular Dynamics simulations to investigate the interplay between solute concentration, grain boundary structure, deformation mechanism, and strength in Zr-segregated nanograined Cu. Results exhibit significant strength enhancement by optimizing segregation, extending the strengthening effect to a grain size as small as 3.75 nm. Continuous Zr segregation induces a progressive transition from original grain boundaries to segregated and ultimately amorphous grain boundaries. Amorphization alters the dominant deformation mechanism from grain boundary migration to homogeneous shear-transformation-zone activation, fostering and optimizing the strengthening effect in extremely fine nanograined Cu. These findings inspire a novel approach of segregation-induced grain boundary amorphization to leverage strong boundaries and extremely fine nanograins for strengthening nanograined metals.
引用
收藏
页码：5493 / 5501
页数：9
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