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The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, lar...

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Autores principales: Preisler, Dalibor, Janeček, Miloš, Harcuba, Petr, Džugan, Jan, Halmešová, Kristýna, Málek, Jaroslav, Veverková, Anna, Stráský, Josef
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947503/
https://www.ncbi.nlm.nih.gov/pubmed/31861121
http://dx.doi.org/10.3390/ma12244233
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author Preisler, Dalibor
Janeček, Miloš
Harcuba, Petr
Džugan, Jan
Halmešová, Kristýna
Málek, Jaroslav
Veverková, Anna
Stráský, Josef
author_facet Preisler, Dalibor
Janeček, Miloš
Harcuba, Petr
Džugan, Jan
Halmešová, Kristýna
Málek, Jaroslav
Veverková, Anna
Stráský, Josef
author_sort Preisler, Dalibor
collection PubMed
description Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction.
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spelling pubmed-69475032020-01-13 The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy Preisler, Dalibor Janeček, Miloš Harcuba, Petr Džugan, Jan Halmešová, Kristýna Málek, Jaroslav Veverková, Anna Stráský, Josef Materials (Basel) Article Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction. MDPI 2019-12-17 /pmc/articles/PMC6947503/ /pubmed/31861121 http://dx.doi.org/10.3390/ma12244233 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Preisler, Dalibor
Janeček, Miloš
Harcuba, Petr
Džugan, Jan
Halmešová, Kristýna
Málek, Jaroslav
Veverková, Anna
Stráský, Josef
The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title_full The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title_fullStr The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title_full_unstemmed The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title_short The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy
title_sort effect of hot working on the mechanical properties of high strength biomedical ti-nb-ta-zr-o alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947503/
https://www.ncbi.nlm.nih.gov/pubmed/31861121
http://dx.doi.org/10.3390/ma12244233
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