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Microstructure formation of porous sintered Ti-Si-Zr compacts with mechanically alloyed-activated Ti-Si and TiH2 powders
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0002-0101-0062
Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
2014 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 594, 202-210 p.Article in journal (Refereed) Published
Abstract [en]

Metallic implants are widely used in applications associated with bone. A major drawback of using metals is their elastic modulus which is higher than that of bone resulting in stress shielding and premature failure of the implant. The employment of biomaterials with a porous structure has the potential to lower the modulus and promote osseointegration. The present work investigates the microstructure formation and the resulting elastic modulus of a new Ti-Si-Zr alloy. The sintering procedure involves the use of both mechanically alloyed Ti-Si powder and TiH2 to activate sintering with the TiH2 also serving as a pore precursor. The procedure is designed to promote bonding but not consolidation. The influence of sintering temperature, heating rate, as well as the amount and size of the TiH2 on the phases formed and porosity was investigated. It was observed that the use of TiH2 increased the degree of porosity whilst the size of TiH2 particles could be used to control the pore size. The results showed that when using small TiH2 particles, the elastic modulus was strongly dependent on the fraction of TiH2. When large TiH2 particles were used, the porosity had no significant influence on the elastic modulus. The variation in behavior could be attributed to differences in microstructure. To control the bulk modulus it is essential to understand the differences in the microstructure formation mechanisms between these two cases. (C) 2014 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2014. Vol. 594, 202-210 p.
Keyword [en]
Titanium, Zirconium, Silicon, Titanium dihydride, Transient liquid phase sintering, Mechanical alloying
National Category
Metallurgy and Metallic Materials Materials Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:hj:diva-25917DOI: 10.1016/j.jallcom.2014.01.105ISI: 000331723100034Scopus ID: 2-s2.0-84894207326Local ID: JTHMaterialISOAI: oai:DiVA.org:hj-25917DiVA: diva2:789196
Available from: 2015-02-18 Created: 2015-02-18 Last updated: 2016-11-29Bibliographically approved

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