Journal
APPLIED SURFACE SCIENCE
Volume 416, Issue -, Pages 891-900Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.04.223
Keywords
Hardness; Cyclic loading; Nickel alloy; Transmission electron microscopy; Indentation
Categories
Funding
- Excellent Young Scientists Fund of NSFC [51422502]
- Integrated Program for Major Research Plan of NSFC [91323302]
- Science Fund for Creative Research Groups of NSFC [51621064]
- Changjiang Scholars Program of Ministry of Education of China
- Tribology Science Fund of State Key Laboratory of Tribology, Tsinghua University [SKLTKF14A03]
- Science Fund of the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University [201501]
- Xinghai Science Funds for Distinguished Young Scholars and Thousand Youth Talents at Dalian University of Technology
- Natural Science Foundation of Jiangsu Province [BK20151190]
- Distinguished Young Scholars for Science and Technology of Dalian City [2016RJ05]
- Science Fund of Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences [2017K02]
- Collaborative Innovation Center of Major Machine Manufacturing in Liaoning
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Nanotwinned (NT) surfaces are developed on a face-centered cubic (fcc) metal with ultrahigh hardness under cyclic loading using plastic deformation at room temperature. The hardness on NT surfaces remains constant at 7.9 and 8.5 GPa indented at 1 and 7 N under 0-100 cycles respectively, which are about three times that of their pristine surfaces. This is different from the NT metals and nonmetallic materials, on which the hardness is about two times that of their pristine counterparts. Moreover, NT metals usually consist of randomly oriented twin and grain boundaries, making it difficult to control the uniform mechanical property. Here, novel nt structure is proposed on an fcc metal, in which all the twin boundaries are along (-1-11) orientation, forming bundles of nanotwins to several micrometers in length. (C) 2017 Elsevier B.V. All rights reserved.
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