ELECTRON MICROSCOPY STUDY OF FIVE-FOLD TWINS IN ELECTRODEPOSITED NANO-TWIN Ni

doi:10.3724/SP.J.1037.2013.00443

Acta Metall Sin

2014, Vol. 50

Issue (3): 305-312 DOI: 10.3724/SP.J.1037.2013.00443

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ELECTRON MICROSCOPY STUDY OF FIVE-FOLD TWINS IN ELECTRODEPOSITED NANO-TWIN Ni

SHAN Haiquan¹, ZHANG Yuefei¹(

), MAO Shengcheng¹, ZHANG Ze²

1 Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124
2 Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310058

Cite this article:

SHAN Haiquan, ZHANG Yuefei, MAO Shengcheng, ZHANG Ze. ELECTRON MICROSCOPY STUDY OF FIVE-FOLD TWINS IN ELECTRODEPOSITED NANO-TWIN Ni. Acta Metall Sin, 2014, 50(3): 305-312.

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Abstract

The nanocrystalline Ni thin films with high density nano-scale growth twins were synthesized by direct electrodeposition technology. The five-fold twinning structure in electrodeposited nano-twin Ni was systematically investigated by TEM. The remarkable diffraction pattern and HRTEM images obtained from the cross-section observation demonstrate directly that the electrodeposited nano-twin Ni has five-fold twinning structure with five {111} twinned subcrystals and systematically analyzed the 7.35° intrinsic structural gap. In this work, the 7.35°gap was at least inset in two twin boundaries of the five-fold twin, the twin boundaries which share the 7.35° gap always broaden and was decomposed into other twins, so that, the grain present a irregular shape. cross-sectional TEM micrograph revealed that the electrodeposited nano-twin Ni had columnar grain structure with a strong {110} texture. By means of comprehensive structure characterization, a new space structural model of the five-fold twin was proposed.

Key words: electrodeposition nanao-twin Ni microstructure transmission electron microscopy (TEM) five-fold twin

Received: 25 July 2013

ZTFLH:	TG146.15
	TG113.11

Fund: Supported by National Natural Science Foundation of China (Nos.11374027 and 51001003) and Key Project Funding Scheme of Beijing Municipal Education Committee (No.KZ201010005002)

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	Haiquan SHAN
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00443 OR https://www.ams.org.cn/EN/Y2014/V50/I3/305

Fig.1

纳米孪晶Ni中五次对称孪晶结构的TEM像

Fig.2

纳米孪晶Ni中五次孪晶的高分辨图像及快速Fourier变换图

Fig.3

孪晶界的高分辨图像进行FFT得到的二次电子衍射图以及根据实验结果提出的五次孪晶平面结构模型

Fig.4

电沉积纳米孪晶Ni的截面TEM像及空间结构示意图

Fig.5

电沉积纳米孪晶Ni中五次孪晶的HRTEM像及FFT图

Fig.6

五次对称形核过程示意图

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