Superior combination of strength and ductility in gradient-structured Cu-Ge alloy

doi:10.1016/j.matchar.2025.114959

Superior combination of strength and ductility in gradient-structured Cu-Ge alloy

2025-05-01

0

PRE

AI

B

Baozhuang Cai

L

Lele Sun

X

Xingfu Li

M

Mengxiang Zhang

杨景然 (Jingran Yang)

C

Cong Li

Z

Zhilin Wu

王

王津 (Jin Wang)

D

Delong Zhang

高

高博 (Bo Gao)

T

Tabasum Huma

DOI：10.1016/j.matchar.2025.114959

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Abstract

En 中文

The microstructures and mechanical properties of gradient Cu-9.0 at.%Ge alloy produced by surface mechanical attrition treatment (SMAT) with different durations at the liquid nitrogen temperature have been investigated. In the process of SMAT, the gradient distribution of defects, including dislocations, twins, and stacking faults was formed. The SMATed alloy showed more than twice the yield strength, while the uniform elongation remained as much as similar to 0.65, comparable to that in the untreated samples, suggesting excellent strength-ductility synergy. Multiple strengthening mechanisms promoted strengthening and hardening, including dislocation pile-up, deformation twinning, and stacking faults. The accommodation deformation between the surface hard and central soft layers induced strain delocalization. The strength-ductility synergy of the alloy is attributed to the high strain hardening rate caused by hetero-deformation-induced (HDI) hardening, strain delocalization, and synergistic strengthening. The study provides new insights and guidelines for the future design of gradient materials.

Keywords:

Cu-Ge alloy

Gradient structure

Strength-ductility synergy

Hetero-deformation induced hardening

Strain delocalization

Superior combination of strength and ductility in gradient-structured Cu-Ge alloy

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