Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
Autor: | Amirhesam Amerinatanzi, Mohammadreza Nematollahi, Paola Bassani, N. Shayesteh Moghaddam, Carlo Alberto Biffi, Mohammad J. Mahtabi, Mohammad Elahinia, Ausonio Tuissi |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Scanning electron microscope XRD EBSD microstructure 02 engineering and technology lcsh:Technology 01 natural sciences Article NiTi ultrasonic nano-crystal surface modification 0103 physical sciences General Materials Science Selective laser melting Composite material lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Microstructure Nanocrystal lcsh:TA1-2040 Nickel titanium Diffusionless transformation selective laser melting Surface modification lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 Electron backscatter diffraction |
Zdroj: | Materials Proceedings of the National Academy of Sciences of the United States of America 12 (2019): 3068-1–3068-16. doi:10.3390/ma12193068 info:cnr-pdr/source/autori:Biffi C. A.; Bassani P.; Nematollahi M.; Moghaddam N. S.; Amerinatanzi A.; Mahtabi M. J.; Elahinia M.; Tuissi A./titolo:Effect of ultrasonic nanocrystal surface modification on the microstructure and martensitic transformation of selective laser melted nitinol/doi:10.3390%2Fma12193068/rivista:Proceedings of the National Academy of Sciences of the United States of America/anno:2019/pagina_da:3068-1/pagina_a:3068-16/intervallo_pagine:3068-1–3068-16/volume:12 Volume 12 Issue 19 Materials, Vol 12, Iss 19, p 3068 (2019) |
ISSN: | 1996-1944 |
Popis: | Nitinol has significant potential for biomedical and actuating-sensing devices, thanks to its functional properties. The use of selective laser melting (SLM) with Nitinol powder can promote novel applications aimed to produce 3D complex parts with integrated functional performances. As the final step of the production route, finishing processing needs to be investigated both for the optimization of the surface morphology and the limit alteration of the Nitinol functional properties. In this work, the effect of an advanced method of surface modification, ultrasonic nanocrystal surface modification (UNSM), on the martensitic transformation and microstructure of SLM built Ni50.8Ti49.2 (at.%) was investigated. Scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry indicated that the UNSM process can generate stress-induced martensite, at least partially suppressing the martensitic transformation. The microhardness profile indicates that the UNSM process can affect the mechanical properties of the SLMed Nitinol sample in a range of up to approximately 750 &mu m in depth from the upper surface, while electron backscatter diffraction analysis highlighted that the initial austenitic phase was modified within a depth below 200 &mu m from the UNSMed surface. |
Databáze: | OpenAIRE |
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