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New Beta-type Ti-Fe-Sn-Nb alloys with superior mechanical strength
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Tohoku University, Japan.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2017 (English)In: Journal of Materials Science and Engineering: A, ISSN 2161-6213, Vol. 705, 348-351 p.Article in journal (Refereed) Published
Abstract [en]

Ti-Fe-Sn-Nb alloys comprised of single beta-Ti phase were developed showing excellent mechanical strength and superior plasticity. The alloys exhibited increased yield strength as a function of Fe content, where the Ti80Fe14Sn3Nb3 alloy presented the highest yield stress (1.88 GPa) comparable to that of Ti-based nanocrystalline alloys. Moreover, a significant strain-hardening (520 MPa) was achieved along with the plastic deformation. The excellent mechanical strength was enhanced by the supersaturated beta-Ti and the high density of lattice defects that restrict the dislocation motion.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 705, 348-351 p.
Keyword [en]
Ti-Fe-Sn-Nb, Mechanical properties, Beta-Ti alloy, beta-stability
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-208639DOI: 10.1016/j.msea.2017.08.060ISI: 000413135700042Scopus ID: 2-s2.0-85028563705OAI: oai:DiVA.org:kth-208639DiVA: diva2:1107606
Note

QC 20170612

Available from: 2017-06-09 Created: 2017-06-09 Last updated: 2017-11-06Bibliographically approved
In thesis
1. High-performance Load-bearing Alloys
Open this publication in new window or tab >>High-performance Load-bearing Alloys
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this thesis is to study advanced metallic alloys as load-bearing componentsfor engineering and biomedical applications. The investigations have been focusing onthe improvement of the properties and performance of existing materials as well assynthesizing and developing completely new materials. This thesis covers alloy design,microstructure characterizations, mechanical and electrochemical tests, together withevaluating the tribocorrosion performances under the combined action of wear andcorrosion. The thesis consists of three parts:In part one (paper I and II), two types of multicomponent Ti-Fe-Sn-Nb alloys weredeveloped showing superior mechanical properties with distinct microstructures. Firstlythe hypoeutectic alloy consisting of ductile dendrites and ultrafine eutectic presentedsuperior yield strength and enhanced ductility compared to those of bulk metallicglasses (BMGs). Secondly, the β-type alloys completely retaining of β-Ti phasedisplayed outstanding plasticity without sacrificing the high mechanical strength.In part two (paper III), a series of Ti-based glassy alloys containing no biological toxicelements e.g. Ni, Cu and Al, were designed by a novel method coupling thermodynamiccalculations and topological instability criterion. A self-consistent thermodynamicdatabase was constructed based on the CALPHAD (Calculation of Phase Diagrams)approach. The experimental verifications matched reasonably well with the theoreticalcalculation, suggesting this method provides an effective approach for glass formingpredictions.In part three (paper IV and V), the degradation mechanisms of the load-bearing Zrbased BMGs were evaluated under the effects of tribological wear and electrochemicalcorrosion. Comparatively the tribo-electrochemical performances of the surfacemodified (plasma nitriding or diamond-like carbon) conventional metallic biomaterialsi.e. medical grade pure Ti, stainless steel and CoCrMo alloys, were investigated in linewith that of the BMGs.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 44 p.
National Category
Materials Engineering
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-208641 (URN)9789177294283 (ISBN)
Public defence
2017-06-08, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20170612

Available from: 2017-06-12 Created: 2017-06-09 Last updated: 2017-06-12Bibliographically approved

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