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Degradation of Zr-based bulk metallic glasses used in load-bearing implants: A tribocorrosion appraisal
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. NTNU Norwegian University of Science and Technology, Norway. (ENHETEN STRUKTURER)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN STRUKTURER)ORCID iD: 0000-0002-8493-9802
2016 (English)In: Journal of The Mechanical Behavior of Biomedical Materials, ISSN 1751-6161, E-ISSN 1878-0180, Vol. 60, 56-67 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Owing to the amorphous structure, Bulk Metallic Glasses (BMGs) have been demonstrating attractive properties for potential biomedical applications. In the present work, the degradation mechanisms of Zr-based BMGs with nominal compositions Zr55Cu30Ni5Al10 and Zr65Cu18Ni7Al10 as potential load-bearing implant material were investigated in a tribocorrosion environment. The composition-dependent micro-mechanical and tribological properties of the two BMGs were evaluated prior to the tribocorrosion tests. The sample Zr65-BMG with a higher Zr content exhibited increased plasticity but relatively reduced wear resistance during the ball-on-disc tests. Both BMGs experienced abrasive wear after the dry wear test under the load of 2N. The cross-sectional subsurface structure of the wear track was examined by Focused Ion Beam (FIB). The electrochemical properties of the BMGs in simulated body fluid were evaluated by means of potentiodynamic polarization and X-ray Photoelectron Spectroscopy (XPS). The spontaneous passivation of Zr-based BMGs in Phosphate Buffer Saline solution was mainly attributed to the highly concentrated zirconium cation (Zr4+) in the passive film. The tribocorrosion performance of the BMGs was investigated using a reciprocating tribometer equipped with an electrochemical cell. The more passive nature of the Zr65-BMG had consequently a negative influence on its tribocorrosion resistance, which induced the wear-accelerated corrosion and eventually speeded-up the degradation process. It has been revealed the galvanic coupling was established between the depassivated wear track and the surrounding passive area, which is the main degradation mechanism for the passive Zr65-BMG subjected to the tribocorrosion environment.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 60, 56-67 p.
Keyword [en]
Bulk metallic glasses, Degradation, Tribocorrosion, Wear, Aluminum, Glass, Ion beams, Medical applications, Nickel, Wear of materials, Wear resistance, X ray photoelectron spectroscopy, Biomedical applications, Bulk metallic glass, Phosphate buffer salines, Reciprocating tribometer, Spontaneous passivation, Subsurface structures, Tribo-corrosion, Zr based bulk metallic glass, Metallic glass, biomaterial, metal, phosphate buffered saline, unclassified drug, zirconium, Article, body fluid, corrosion, electrochemistry, film, implant, mechanical stress, plasticity, potentiodynamic polarization, priority journal, procedures, surface property, Young modulus
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186919DOI: 10.1016/j.jmbbm.2015.12.024ISI: 000378969100006Scopus ID: 2-s2.0-84954529193OAI: oai:DiVA.org:kth-186919DiVA: diva2:931194
Note

QC 20160526

Available from: 2016-05-26 Created: 2016-05-16 Last updated: 2017-06-09Bibliographically 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)
Opponent
Supervisors
Note

QC 20170612

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

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