Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys

In an ageing population today, there is an increasing demand for biomedical implants to replace hard tissue failures in most elderly. Currently, titanium alloys are one of the most popular biomaterials used in the manufacture of implants due to its high corrosion resistance and high strength. Amongs...

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Main Author: Yeo, Kai Ni
Other Authors: Matteo Seita
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/150634
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1506342021-06-10T00:36:21Z Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys Yeo, Kai Ni Matteo Seita School of Mechanical and Aerospace Engineering mseita@ntu.edu.sg Engineering::Mechanical engineering In an ageing population today, there is an increasing demand for biomedical implants to replace hard tissue failures in most elderly. Currently, titanium alloys are one of the most popular biomaterials used in the manufacture of implants due to its high corrosion resistance and high strength. Amongst which, Ti-6Al-4V alloy is most commonly used. However, many literatures pointed that Ti-6Al-4V alloys may no longer be suitable, primarily due to the presence of cyto- toxicity elements (V) and its high modulus of elasticity which result in stress shielding effect. Therefore, there is a need to seek for alternatives. In this work, the effect of addition of Niobium (Nb) into Titanium alloys was studied. This study focused on the changes in microstructure and mechanical properties of the alloys. Ti-42Nb and Ti-45Nb were selected to represent the Ti-Nb alloys. Microscopically, Ti-Nb alloys were found to have majority body-centred cubic crystallographic structures, indicating that they were beta phase alloys. Moreover, they had near equiaxed beta grains with random orientation. Mechanically, Ti-Nb alloys demonstrated lower hardness, yield strength and ultimate tensile strength as compared to Ti-6Al-4V. However, these came with attractive trade- offs as the Ti-Nb were discovered to possess significantly lower modulus of elasticity and higher ductility. Hence, this paper concludes that the Ti-Nb alloys have the potential to replace the Ti-6Al-4V as biomaterial for implants. Bachelor of Engineering (Mechanical Engineering) 2021-06-09T00:58:46Z 2021-06-09T00:58:46Z 2021 Final Year Project (FYP) Yeo, K. N. (2021). Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/150634 https://hdl.handle.net/10356/150634 en B286 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
spellingShingle Engineering::Mechanical engineering
Yeo, Kai Ni
Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
description In an ageing population today, there is an increasing demand for biomedical implants to replace hard tissue failures in most elderly. Currently, titanium alloys are one of the most popular biomaterials used in the manufacture of implants due to its high corrosion resistance and high strength. Amongst which, Ti-6Al-4V alloy is most commonly used. However, many literatures pointed that Ti-6Al-4V alloys may no longer be suitable, primarily due to the presence of cyto- toxicity elements (V) and its high modulus of elasticity which result in stress shielding effect. Therefore, there is a need to seek for alternatives. In this work, the effect of addition of Niobium (Nb) into Titanium alloys was studied. This study focused on the changes in microstructure and mechanical properties of the alloys. Ti-42Nb and Ti-45Nb were selected to represent the Ti-Nb alloys. Microscopically, Ti-Nb alloys were found to have majority body-centred cubic crystallographic structures, indicating that they were beta phase alloys. Moreover, they had near equiaxed beta grains with random orientation. Mechanically, Ti-Nb alloys demonstrated lower hardness, yield strength and ultimate tensile strength as compared to Ti-6Al-4V. However, these came with attractive trade- offs as the Ti-Nb were discovered to possess significantly lower modulus of elasticity and higher ductility. Hence, this paper concludes that the Ti-Nb alloys have the potential to replace the Ti-6Al-4V as biomaterial for implants.
author2 Matteo Seita
author_facet Matteo Seita
Yeo, Kai Ni
format Final Year Project
author Yeo, Kai Ni
author_sort Yeo, Kai Ni
title Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
title_short Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
title_full Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
title_fullStr Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
title_full_unstemmed Effect of Nb addition on the microstructure and mechanical properties of additively manufactured Ti alloys
title_sort effect of nb addition on the microstructure and mechanical properties of additively manufactured ti alloys
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/150634
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