| 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 | |
| Source Publication | APPLIED PHYSICS LETTERS
 |
| ISSN | 0003-6951 |
| Volume | 109Issue:8 |
| Abstract | 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. |
| description.department | [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 |
| Subject Area | Physics, Applied |
| Funding Organization | 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 |
| Indexed By | sci |
| Language | 英语 |
| WOS ID | WOS:000383849000010 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/76303 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | 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. |
| Recommended Citation 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). |
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