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New porous Mg composites for bone implants

Version 2 2024-06-04, 12:02
Version 1 2017-07-13, 09:44
journal contribution
posted on 2024-06-04, 12:02 authored by A Vahid, Peter HodgsonPeter Hodgson, Y Li
Various porous Mg alloys and composites have been fabricated to date. However, typically they have unsatisfactory mechanical properties, particularly in load bearing applications. In the current work, porous magnesium-niobium (Mg-Nb) and magnesium-tantalum (Mg-Ta) composites were fabricated via a combination of mechanical milling and powder metallurgy processes. The effect of Nb and Ta contents on the porosity, pore size and mechanical properties of the porous Mg composites was investigated. The microstructural observations show irregular cell shapes, including micro- and macro-pores in the porous materials. The number and size of macro-pores increased with an increase in the amount of reinforcement (Nb or Ta). The mechanical properties of the porous Mg composites increased with an increase in reinforcement contents up to 2 wt% and then decreased. The type, particle size and position of reinforcements influence the strength of porous composites. Fractography of the compressed porous samples showed that in porous Mg-Nb and Mg-Ta composites, cracks are initiated from pores and gaps between Mg powders and propagated through cell walls and cell edges. The strength of these porous Mg composites is comparable to that of human bone.

History

Journal

Journal of Alloys and Compounds

Volume

724

Pagination

176-186

Location

Amsterdam, The Netherlands

ISSN

0925-8388

eISSN

1873-4669

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, Elsevier B.V.

Publisher

ELSEVIER SCIENCE SA