Structure and energetics of nanotwins in cubic boron nitrides

IMR OpenIR

	Structure and energetics of nanotwins in cubic boron nitrides
	Zheng, SJ; Zhang, RF; Huang, R; Taniguchi, T; Ma, XL; Ikuhara, Y; Beyerlein, IJ; Zheng, SJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.; Zhang, RF (reprint author), Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China.; Zhang, RF (reprint author), Beihang Univ, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China.
	2016-08-22
发表期刊	APPLIED PHYSICS LETTERS
ISSN	0003-6951
卷号	109 期号:8
摘要	Recently, nanotwinned cubic boron nitrides (NT c-BN) have demonstrated extraordinary leaps in hardness. However, an understanding of the underlying mechanisms that enable nanotwins to give orders of magnitude increases in material hardness is still lacking. Here, using transmission electron microscopy, we report that the defect density of twin boundaries depends on nanotwin thickness, becoming defect-free, and hence more stable, as it decreases below 5 nm. Using ab initio density functional theory calculations, we reveal that the Shockley partials, which may dominate plastic deformation in c-BNs, show a high energetic barrier. We also report that the c-BN twin boundary has an asymmetrically charged electronic structure that would resist migration of the twin boundary under stress. These results provide important insight into possible nanotwin hardening mechanisms in c-BN, as well as how to design these nanostructured materials to reach their full potential in hardness and strength. Published by AIP Publishing.
部门归属	[zheng, shijian ; ma, xiuliang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [zhang, ruifeng] beihang univ, sch mat sci & engn, beijing 100191, peoples r china ; [zhang, ruifeng] beihang univ, int res inst multidisciplinary sci, beijing 100191, peoples r china ; [huang, rong] east china normal univ, key lab polar mat & devices, minist educ, shanghai 200062, peoples r china ; [taniguchi, takashi] natl inst mat sci, tsukuba, ibaraki 3050044, japan ; [ikuhara, yuichi] japan fine ceram ctr, nanostruct res lab, nagoya, aichi 4568587, japan ; [ikuhara, yuichi] univ tokyo, inst engn innovat, tokyo 1138656, japan ; [beyerlein, irene j.] los alamos natl lab, div theoret, los alamos, nm 87545 usa
学科领域	Physics, Applied
资助者	Hundred Talents Project of the Chinese Academy of Sciences; National Thousand Young Talents Program of China; Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China [51471018]; Laboratory Directed Research and Development Program Award [20140348ER]; National Supercomputer Center at TianJin
收录类别	sci
语种	英语
WOS记录号	WOS:000383849000010
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/76303
专题	中国科学院金属研究所
通讯作者	Zheng, SJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.; Zhang, RF (reprint author), Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China.; Zhang, RF (reprint author), Beihang Univ, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China.
推荐引用方式 GB/T 7714	Zheng, SJ,Zhang, RF,Huang, R,et al. Structure and energetics of nanotwins in cubic boron nitrides[J]. APPLIED PHYSICS LETTERS,2016,109(8).
APA	Zheng, SJ.,Zhang, RF.,Huang, R.,Taniguchi, T.,Ma, XL.,...&Zhang, RF .(2016).Structure and energetics of nanotwins in cubic boron nitrides.APPLIED PHYSICS LETTERS,109(8).
MLA	Zheng, SJ,et al."Structure and energetics of nanotwins in cubic boron nitrides".APPLIED PHYSICS LETTERS 109.8(2016).