Nanoindentation of a nickel surface with twin boundaries using molecular dynamics simulations

被引：3

作者：

Zhang, Qin ^{[1
]}

Zhou, Bingrao ^{[1
]}

Wang, Yimin ^{[1
]}

Zhang, Zefei ^{[1
]}

Zang, Zhiwei ^{[1
]}

Lv, Zhiqing ^{[1
,2
]}

机构：

[1] Yanshan Univ, Key Lab Adv Forging & Stamping Technol & Sci, Minist Educ China, Qinhuangdao 066004, Hebei, Peoples R China

[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2022年 / 38卷 / 15期

关键词：

Nickel; nanoindentation; hardness; dislocation evolution; molecular dynamics; GRAIN-BOUNDARY; ATOMISTIC SIMULATION; DEFORMATION; METALS; FILMS; NI;

D O I：

10.1080/02670836.2022.2075103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, nanoindentation on a (110) crystal plane with a spherical indenter and (111) twin boundaries at different distances was simulated using molecular dynamics. In addition, the load-displacement curves and mechanical properties were calculated, and the deformation mechanism of the nickel matrix was analysed using a dislocation extraction algorithm (DXA). The results showed that the load decreased in the load-displacement curve, which was caused by the initial nucleation of the dislocations, and the twinning boundary hindered dislocation propagation. Furthermore, Young's modulus values near the twin boundary were lower than those farther away, and the maximum shear stress near the twin boundary was lower. Therefore, dislocation activity in the nickel matrix during indentation was mainly in the form of Shockley partial dislocations.

引用

页码：1218 / 1229

页数：12

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