Mechanical behaviour of pressed and sintered titanium alloys obtained from master alloy addition powders

Materials Science and Engineering: C

2015

Self Cite

Titanium and its alloys are characterized by an exceptional combination of properties like high strength, good corrosion resistance and biocompatibility which makes them suitable materials for biomedical prosthesis and devices. The wrought Ti-6Al-4V alloy is generally favored in comparison to other metallic biomaterials due to its relatively low elastic modulus and it has been long used to obtain products for biomedical applications. In this work an alternative route to fabricate biomedical implants made out of the Ti-6Al-4V alloy is investigated. Specifically, the feasibility of the conventional powder metallurgy route of cold uniaxial pressing and sintering is addressed by considering two types of powders (i.e. blended elemental and prealloyed). The characterization of physical properties, chemical analysis, mechanical behavior and microstructural analysis is carried out in-depth and the properties are correlated among them. On the base of the results found, the produced alloys are promising materials for biomedical applications as well as cheaper surgical devices and tools.

Section: Accepted M Manuscriptsupporting

confidence: 88%

Section: Consolidation Of the Ti-6al-4v Materialsmentioning

confidence: 99%

Feasibility study of the production of biomedical Ti–6Al–4V alloy by powder metallurgy

Materials Science and Engineering: C

2015

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“…Similar behaviour with the sintering temperature and comparable level of porosity to those shown in Fig. 2 can be obtained in powder metallurgy α+β Ti alloys by alloying elemental Ti with conventional master alloys [10,11] or iron [12,13] and stainless steel powder [7]. From the micrographs shown in Fig.…”

Section: Resultssupporting

confidence: 79%

Low-Cost α+β PM Ti Alloys by Fe/Ni Addition to Pure Ti

2016

MSF

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Ti and its alloys can deliver a very interesting combination of properties such as low density, high strength, corrosion resistance and biocompatibility and, therefore, are very flexible materials which can be adapted to various applications. Nonetheless, Ti and Ti alloys are only employed in critical applications (i.e. aeronautical and aerospace, nautical, medical, etc.) or in products for leisure. In both of these cases the higher fabrication costs of Ti in comparison to its competitors (i.e. steel and aluminium) is not the limiting factor as it is for many structural applications, especially for mass production (i.e. automotive sector). The use of creative techniques and the decrement of the starting price of Ti have been identified as the two main routes to follow to decrease the fabrication costs. In this study, the production of low-cost α+β Ti alloys has been assessed by combining the addition of cheap alloying elements (in particular a Fe/Ni powder) with the classical powder metallurgy route (pressing and sintering). Physical and mechanical properties as well as microstructural analysis of these low-cost alloys were measured and correlated to the processing parameters used to sinter them. It is found that the low-cost Ti alloys show similar behaviour to conventional α+β Ti alloys and, thus, have the potential to be used for non-critical applications.

“…The relative density values shown in Figure 3 are similar to those available in the literature for PM titanium alloys [17][18][19]. M A N U S C R I P T…”

Section: Accepted M Manuscriptsupporting

confidence: 79%

Influence of sintering parameters on the properties of powder metallurgy Ti–3Al–2.5V alloy

Materials Characterization

2013

Self Cite

The processing of near net shape Ti-3Al-2.5V components using the conventional pressing and sintering route is addressed in this study. The Ti-3Al-2.5V starting powder was obtained considering both the blending elemental and the master alloy addition methods. The powders were uniaxially pressed and sintered in a high-vacuum furnace under various temperaturetime combinations. The influence of the processing parameters on the relative density, microstructural features, amount of interstitials, mechanical behaviour, thermal conductivity and electrical resistivity of the sintered materials was evaluated. It was found that the relative density of the samples increases with processing temperature and time, and almost fully dense materials were obtained. The mechanical performance of the Ti-3Al-2.5V improves due to the reduction of the residual porosity and are, generally, of the same order of magnitude of those required for titanium biomedical products. Furthermore, the temperatures-times selected permit to obtain thermal and electrical properties similar to the wrought alloy.