应变对面心立方结构孪晶纳米线变形机制影响的原位原子尺度研究

应变对面心立方结构孪晶纳米线变形机制影响的原位原子尺度研究

杨成鹏¹，孙 涛¹，韦如建¹，卢 艳¹, 孔德利¹，罗俊峰²，贺 昕²，熊晓东²，王兴权²，王立华^1∗，张 泽^{1, 3∗}，韩晓东^1∗

（1. 北京工业大学固体微结构与性能研究所，北京市先进材料微结构与性能重点实验室，北京100124；2. 有研亿金新材料有限公司, 北京102200；3. 浙江大学材料科学与工程学院，浙江 杭州310007）

摘  要  本文利用原位实验技术，在透射电镜中实现了对直径约为40 nm的孪晶结构Ni 纳米线（D = ~40 nm）的弯曲变形实验，并对其塑性变形机制进行了原位原子尺度研究。原位原子尺度研究表明，弯曲应变对孪晶结构Ni 纳米线的塑性行为有显著影响。在弯曲变形的初始阶段，塑性变形受位错行为控制，并且孪晶厚度对位错类型和滑移系具有重要影响。随着弯曲应变的增加，纳米线中观察到了连续的晶格畸变以及面心立方-体心四方的相转变。当弯曲应变继续增加超过~ 30%时，塑性变形方式由晶格畸变/塌陷引起的晶界形核主导。本实验提供了孪晶结构Ni 纳米线在大塑性变形下的塑性变形图像，对理解不同的弯曲应变对孪晶结构Ni 纳米线变形机制的影响具有借鉴意义。

关键词  面心立方金属；孪晶结构镍纳米线；塑性机制；相变

中图分类号：O733；TG383；TG115. 5⁺2；TG115. 21⁺5. 3

文献标识码：Adoi:10.3969/j.issn.1000-6281.2020.05.004

Effect of strain on the deformation mechanism of twin-structured Ni nanowires (NWs)

YANG Cheng-peng¹, SUN Tao¹, WEI Ru-jian¹, LU Yan¹, KONG De-li¹, LUO Jun-feng²,HE Xin²,XIONG Xiao-dong², WANG Xing-quan², WANG Li-hua^1*, ZHANG Ze^1，3*, HAN Xiao-dong^1*

(1. Beijing Key Lab of Microstructure and Property of Advanced Material, Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124; 2. Grikin Advanced Materials CO., LTD.,  Beijing 102200;

3. Department of Materials Science, Zhejiang University, Hangzhou Zhangjiang 310007, China)

Abstract Using home-made techniques, the in situ atomic-scale bending experiments were conducted on twin-structural Ni nanowires (NWs) (D=~40 nm). A number of in situ atomic-scale observations indicated that the plastic activities of twin-structural Ni NWs can be significantly affected by the bending strain. In the early stages of bending, their plastic deformations were controlled by dislocation activities, and there was a strong effect of twin thickness on dislocation type and glide systems. With bending strain increasing, fcc-bct phase transition was observed. When the bending strain increased to a significant level, the grain boundaries (GBs) that resulted from dislocation activities and lattice distortion/collapse were detected. This study provided a plastic deformation picture of the twin-structured Ni NWs after severe plastic deformation, and advanced our understanding of how the bending strain affected the deformation mechanisms of twin-structural Ni.

Keywords   fccstructured metal; twin-structural Ni nanowires; plasticity mechanism；phase transition

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