Quantifying geometrically necessary dislocation with surface roughness effect in copper (111) under indentation

• Published in: Materials Science and Technology (United Kingdom)
• Main Author: Kok W.M.; Chuah H.G.; How H.G.; Teoh Y.H.; Yee H.M.; Tan W.H.
• Format: Article
• Language: English
• Published: Taylor and Francis Ltd. 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136937929&doi=10.1080%2f02670836.2022.2110700&partnerID=40&md5=90c41f94dc238c09d8b8b4af6a2efbda

The present study investigated the geometrically necessary dislocation (GND) with the influence of the surface roughness by establishing the relation of roughness in GND for indentation. The single crystal copper with (111) oriented surface plane was chosen and polished to various roughness levels ranging from 32.7 to 224 nm and subjected to indentation. The increase in surface roughness revealed to increase in the GND and statistically stored dislocation density. As the indentation force decrease from 9.8 to 0.245 N, the plastic strain gradient related to GND increase from 0.0001 up to 0.0017 µm−1 for each 1 nm increment of surface roughness. © 2022 Institute of Materials, Minerals and Mining.