期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 11, 页码 2608-2617出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.06.010
关键词
Zn; Nano-SiC; Biocomposites; Laser melting; Mechanical properties
资金
- National Natural Science Foundation of China [51705540, 81871494, 81871498]
- Hunan Provincial Natural Science Foundation of China [2018JJ3671, 2019JJ50588]
- Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme (2018)
- Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University
- Project of Hunan Provincial Science and Technology Plan [2017RS3008]
- Shenzhen Science and Technology Plan Project [JCYJ20170817112445033]
- National Postdoctoral Program for Innovative Talents [BX201700291]
- Hunan Science and Technology Innovation Plan [2018SK2105, kq1606001]
- China Postdoctoral Science Foundation [2018M632983]
Zn has been regarded as new kind of potential implant biomaterials due to the desirable biodegradability and good biocompatibility, but the low strength and ductility limit its application in bone repairs. In the present study, nano-SiC was incorporated into Zn matrix via laser melting, aiming to improve the mechanical performance. The microstructure analysis showed that nano-SiC distributed along Zn grain boundaries. During the laser rapid solidification, nano-SiC particles acted as the sites for heterogeneous nucleation, which resulted in the reduction of Zn grain size from 250 mu m to 15 mu m with 2 wt% SiC (Zn-2SiC). Meanwhile, nano-SiC acted as a reinforcer by virtue of Orowan strengthening and dispersion strengthening. As a consequence, the nanocomposites showed maximal compressive yield strength (121.8 +/- 5.3 MPa) and high microhardness (72.24 +/- 3.01 HV), which were increased by 441% and 78%, respectively, compared with pure Zn. Moreover, fracture analysis indicated a more ductile fracture of the nanocomposites after the incorporation of nano-SiC. In addition, the nanocomposites presented favorable biocompatibility and accelerated degradation caused by intergranular corrosion. These findings suggested that the nano-SiC reinforced Zn biocomposites may be the potential candidates for orthopedic implants. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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