Abstract
This paper deals with powder processing of Ti6Al4V titanium alloy based materials with tailored porosity and composition. Ti6Al4V powder was mixed either with salt particles acting as space holder, so as to provide two-scale porosity, or with hard TiN particles that significantly modified the microstructure of the material and increased its hardness. Finally an original three-layer component was produced. Sample microstructure was observed by SEM and micro-tomography with special interest in pore size and shape, inclusion distribution and connectivity. Compression tests provided elastic modulus and yield stress as functions of density. These materials are representative of bone implants subjected to complex biological and mechanical conditions. These results thus open avenues for processing personalized implants by powder metallurgy.
Highlights
Powder metallurgy is the ideal route to produce parts with complex composition, microstructure and geometry
We investigated the sintering of various systems based on biocompatible Ti6Al4V titanium alloy with the objective of producing architectured layered materials with suitable features allowing for their use as advanced bone implants
Materials with two scale porosity have been fabricated from the mixture of the powder with salt particles acting as space holders
Summary
Powder metallurgy is the ideal route to produce parts with complex composition, microstructure and geometry. The possibility of fabricating components including several regions with various characteristics (dense, porous, composite) has hardly been considered. This is because of the difficulty of cosintering materials with different densification rates without generating cracks at the interfaces. In the past two decades, many works have been devoted to defining the most appropriate method to fabricate dense and porous Ti6Al4V parts by powder metallurgy [1,2]. We investigated the sintering of various systems based on biocompatible Ti6Al4V titanium alloy with the objective of producing architectured layered materials with suitable features allowing for their use as advanced bone implants. The microstructure of every component has carefully been characterized by SEM and microtomography and its mechanical properties have been evaluated by compression and microhardness tests
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