Enhancement of Mechanical Properties of NiCo Alloy Induced by Inhomogeneous Gradient of Solute Element Segregation

IF 1.5 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Physica Status Solidi B-basic Solid State Physics Pub Date : 2024-09-09 DOI:10.1002/pssb.202400350

Di Liu, Wei Zhang, Xin Guo, Junqiang Ren, Hongtao Xue, Xuefeng Lu

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Abstract

Inhomogeneous gradient nanocrystals have better mechanical properties than uniform gradient nanocrystals. The segregation of solute elements in inhomogeneous gradient nanocrystals is expected to induce the re‐enhancement of mechanical properties of alloys. Herein, solute element segregation structures of inhomogeneous gradient structure nanocrystalline NiCo alloy are established, simulating tensile deformation via molecular dynamics. The results show that the segregation of solute elements in the inhomogeneous gradient structure of nanocrystals can improve the mechanical properties of the alloy, especially the structure of the intragranular segregation. The intragranular segregation of solute elements induces the decrease of grain boundary energy and greatly enhances the stability of grain boundaries. In addition, the segregation of solute elements within grains can hinder the dislocation movement to a certain extent, and the hindering effect on dislocation movement of stable grain boundaries induced by intragranular segregation of solute elements further enhances the mechanical properties of nanocrystalline alloys. This strategy of combining heterogeneous gradient structure and solute element segregation structure provides a positive and interesting perspective for the design of advanced alloys with excellent properties.

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非均质梯度溶质元素偏析对镍钴合金机械性能的影响

非均质梯度纳米晶体比均匀梯度纳米晶体具有更好的机械性能。非均质梯度纳米晶体中溶质元素的偏析有望重新增强合金的力学性能。本文通过分子动力学模拟拉伸变形，建立了非均质梯度结构纳米晶镍钴合金的溶质元素偏析结构。结果表明，非均质梯度结构纳米晶中溶质元素的偏析可以改善合金的力学性能，尤其是晶内偏析结构。溶质元素的晶内偏析导致晶界能量下降，大大提高了晶界的稳定性。此外，溶质元素在晶粒内的偏析能在一定程度上阻碍位错运动，而溶质元素晶粒内偏析对稳定晶界位错运动的阻碍作用进一步提高了纳米晶合金的力学性能。这种将异质梯度结构与溶质元素偏析结构相结合的策略为设计具有优异性能的先进合金提供了积极而有趣的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica Status Solidi B-basic Solid State Physics 物理-物理：凝聚态物理

CiteScore

3.30

自引率

6.20%

发文量

321

审稿时长

2 months

期刊介绍： physica status solidi is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Being among the largest and most important international publications, the pss journals publish review articles, letters and original work as well as special issues and conference contributions. physica status solidi b – basic solid state physics is devoted to topics such as theoretical and experimental investigations of the atomistic and electronic structure of solids in general, phase transitions, electronic and optical properties of low-dimensional, nano-scale, strongly correlated, or disordered systems, superconductivity, magnetism, ferroelectricity etc.