电沉积纳米孪晶Ni中五次孪晶的电子显微分析*
单海权, 男, 1986年生, 硕士生
收稿日期: 2013-07-25
修回日期: 2013-11-19
网络出版日期: 2014-03-20
基金资助
* 国家自然科学基金项目11374027和51001003, 以及北京市教委重点基金项目KZ201010005002资助
ELECTRON MICROSCOPY STUDY OF FIVE-FOLD TWINS IN ELECTRODEPOSITED NANO-TWIN Ni
Received date: 2013-07-25
Revised date: 2013-11-19
Online published: 2014-03-20
Supported by
Supported by National Natural Science Foundation of China (Nos.11374027 and 51001003) and Key Project Funding Scheme of Beijing Municipal Education Committee (No.KZ201010005002)
通过直流电沉积技术制备具有高密度纳米孪晶结构的Ni, 并对该材料中存在的五次孪晶结构进行了深入系统的电子显微分析. 获得了纳米孪晶Ni中五次孪晶结构的HRTEM图像和SAED花样; 研究了单个晶粒内部五次孪晶的结构特性、分布规律. 结果表明, 五次孪晶是由5个{111}晶体旋转组成, 五次旋转孪晶产生的7.35°本征间隙至少由五次孪晶中的2个孪晶界分担; 而且分担间隙的孪晶界呈现宽化现象, 并且分解为新的孪晶, 导致五次孪晶晶粒在整体形状上不具有五次对称性, 呈现出一定的不规则形状. TEM截面形貌分析表明, 电沉积纳米孪晶Ni呈现{110}面平行样品表面织构, 晶粒为柱状晶分布, 柱状生长方向为[110]. 通过综合结构表征, 给出了五次孪晶在三维空间的结构模型.
单海权 , 张跃飞 , 毛圣成 , 张泽 . 电沉积纳米孪晶Ni中五次孪晶的电子显微分析*[J]. 金属学报, 2014 , 50(3) : 305 -312 . DOI: 10.3724/SP.J.1037.2013.00443
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.
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