Journal
COMPOSITES PART B-ENGINEERING
Volume 216, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108882
Keywords
Rare earth; Additive manufacturing; Zn alloy; Creep resistance; Antibacterial activity
Funding
- National Natural Science Foundation of China [51935014, 82072084, 81871498]
- JiangXi Provincial Natural Science Foundation of China [20192ACB20005, 2020ACB214004]
- Provincial Key RAMP
- D Projects of Jiangxi [20201BBE51012]
- Guangdong Province Higher Vocational Colleges AMP
- Schools Pearl River Scholar Funded Scheme (2018)
- China Postdoctoral Science Foundation [2020M682114]
- Open Project of Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University [TLXYCHR-O-21ZD01]
- Open Research Fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology
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In this study, cerium was alloyed with biodegradable Zinc using laser additive manufacturing technique, which effectively improved the mechanical properties and creep resistance. The Zn-Ce alloy exhibited significantly enhanced ultimate tensile strength and reduced creep rate, along with strong antibacterial activity, favorable cytocompatibility, and hemocompatibility, showing promising potential as a candidate for bone repair applications.
Poor mechanical strength and creep resistance limit the orthopedic application of biodegradable Zinc (Zn). In present work, cerium (Ce) was alloyed with Zn using laser additive manufacturing technique. As one kind of rare earth element, Ce possessed high surface activity, which effectively interrupted the grain growth and caused the formation of stable intermetallics, thus contributing to grain refinement strengthening and precipitate strengthening. More significantly, Ce alloying activated more pyramidal slip by means of reducing the critical resolved shear stress during plastic deformation, and resultantly formed the sessile dislocations, which caused the accumulated strain hardening and improved the creep resistance. As a result, Zn-Ce alloy exhibited a considerably improved ultimate tensile strength of 247.4 ? 7.2 MPa, and a reduced creep rate of 1.68 ? 10-7 s-1. Moreover, it exhibited strong antibacterial activity, as well as favorable cytocompatibility and hemocompatibility. All these results demonstrated the great potential of Zn-Ce alloy as a candidate for bone repair application.
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