A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants
A Co–30 at.% Cr–5 at.% Ag alloy was fabricated using a combination of mechanical alloying and spark plasma sintering. The microstructure of the alloy consisted of an ultrafine-grained ε-Co solid solution matrix with an average grain size of 167 nm and uniformly dispersed Ag particles with an average...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-12-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519306288 |
| _version_ | 1819213087810519040 |
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| author | Feilong Jiang Weiwei Zhu Cancan Zhao Yulei Li Pengbo Wei Tian Wan Haixia Ye Shuai Pan Fuzeng Ren |
| author_facet | Feilong Jiang Weiwei Zhu Cancan Zhao Yulei Li Pengbo Wei Tian Wan Haixia Ye Shuai Pan Fuzeng Ren |
| author_sort | Feilong Jiang |
| collection | DOAJ |
| description | A Co–30 at.% Cr–5 at.% Ag alloy was fabricated using a combination of mechanical alloying and spark plasma sintering. The microstructure of the alloy consisted of an ultrafine-grained ε-Co solid solution matrix with an average grain size of 167 nm and uniformly dispersed Ag particles with an average size of 72 nm and a minor amount of nanoscale σ-precipitates with size of 23 nm. Such particular microstructure enabled high hardness of 650 HV and compressive strength of up to 2.3 GPa. Pin-on-disk dry sliding wear tests show that the present alloy exhibited superior wear resistance, with wear rate in the order of 10−5 mm3/(N·m) upon sliding against alumina. The wear-induced microstructure extended only ~500 nm from the sliding surface, with elongated Ag particles. The alloy also demonstrated high resistance to corrosion in artificial saliva solution, due to the formation of a protective passive film. Moreover, the addition of Ag also significantly enhanced the antibacterial activity of Co–Cr alloys, with antibacterial rates against E. coli and S. aureus of 90.5% and 72.6%, respectively. The present alloy with a combination of high strength, superior wear- and corrosion-resistance, and excellent antibacterial activity offers a promising candidate for medical implants. Keywords: Co-Cr-Ag alloy, Spark plasma sintering, Sliding wear, Corrosion, Antibacterial |
| first_indexed | 2024-12-23T06:53:17Z |
| format | Article |
| id | doaj.art-e18e9867ad5a4aec8549e75a6f8e2285 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-23T06:53:17Z |
| publishDate | 2019-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-e18e9867ad5a4aec8549e75a6f8e22852022-12-21T17:56:23ZengElsevierMaterials & Design0264-12752019-12-01184A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implantsFeilong Jiang0Weiwei Zhu1Cancan Zhao2Yulei Li3Pengbo Wei4Tian Wan5Haixia Ye6Shuai Pan7Fuzeng Ren8Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Institute of Applied Physics and Materials Engineering, Faculty of Science & Technology, University of Macau, Macau, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, ChinaDepartment of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Corresponding author.A Co–30 at.% Cr–5 at.% Ag alloy was fabricated using a combination of mechanical alloying and spark plasma sintering. The microstructure of the alloy consisted of an ultrafine-grained ε-Co solid solution matrix with an average grain size of 167 nm and uniformly dispersed Ag particles with an average size of 72 nm and a minor amount of nanoscale σ-precipitates with size of 23 nm. Such particular microstructure enabled high hardness of 650 HV and compressive strength of up to 2.3 GPa. Pin-on-disk dry sliding wear tests show that the present alloy exhibited superior wear resistance, with wear rate in the order of 10−5 mm3/(N·m) upon sliding against alumina. The wear-induced microstructure extended only ~500 nm from the sliding surface, with elongated Ag particles. The alloy also demonstrated high resistance to corrosion in artificial saliva solution, due to the formation of a protective passive film. Moreover, the addition of Ag also significantly enhanced the antibacterial activity of Co–Cr alloys, with antibacterial rates against E. coli and S. aureus of 90.5% and 72.6%, respectively. The present alloy with a combination of high strength, superior wear- and corrosion-resistance, and excellent antibacterial activity offers a promising candidate for medical implants. Keywords: Co-Cr-Ag alloy, Spark plasma sintering, Sliding wear, Corrosion, Antibacterialhttp://www.sciencedirect.com/science/article/pii/S0264127519306288 |
| spellingShingle | Feilong Jiang Weiwei Zhu Cancan Zhao Yulei Li Pengbo Wei Tian Wan Haixia Ye Shuai Pan Fuzeng Ren A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants Materials & Design |
| title | A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants |
| title_full | A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants |
| title_fullStr | A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants |
| title_full_unstemmed | A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants |
| title_short | A strong, wear- and corrosion-resistant, and antibacterial Co–30 at.% Cr–5 at.% Ag ternary alloy for medical implants |
| title_sort | strong wear and corrosion resistant and antibacterial co 30 at cr 5 at ag ternary alloy for medical implants |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519306288 |
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