Flexural properties, thermal conductivity and electrical resistivity of prealloyed and master alloy addition powder metallurgy Ti–6Al–4V

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%

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

Materials Science and Engineering: C

2015

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“…The value of the corresponding relative density (i.e. 94-96%) are common values for titanium alloys obtained by pressing and sintering (Abkowitz and Rowell, 1986;Bolzoni et al, 2013;Ivasishin, 2005). Table 2 shows the results of the chemical analysis carried out on sintered Ti-6Al-7Nb…”

Section: Characterisation Of the Sintered Ti-6al-7nb Componentsmentioning

confidence: 99%

Evaluation of the mechanical properties of powder metallurgy Ti-6Al-7Nb alloy

Journal of the Mechanical Behavior of Biomedical Materials

2017

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Titanium and its alloys are common biomedical materials owing to their combination of mechanical properties, corrosion resistance and biocompatibility. Powder metallurgy (PM) techniques can be used to fabricate biomaterials with tailored properties because changing the processing parameters, such as the sintering temperature, products with different level of porosity and mechanical performances can be obtained. This study addresses the production of the biomedical Ti-6Al-7Nb alloy by means of the master alloy addition variant of the PM blending elemental approach. The sintering parameters investigated guarantee that the complete diffusion of the alloying elements and the homogenization of the microstructure is achieved. The sintering of the Ti-6Al-7Nb alloy induces a total shrinkage between 7.4% and 10.7% and the level of porosity decreases from 6.2% to 4.7% with the increment of the sintering temperature. Vickers hardness (280-300 HV30) and tensile properties (different combination of strength and elongation around 900MPa and 3%) are achieved.

“…The sintering temperature range considered was between 1250 1C and 1350 1C whilst the sintering time was kept constant at 120 min. These parameters were selected on the base of a previous study where it was demonstrated that the increment of the sintering time is not as effective as the increment of the processing temperature to reach high relative density values [17]. It is worth mentioning that due to the layout of the furnace, sintering was carried out discontinuously (by-batches) but a minimum of three samples per material/condition were considered each time.…”

Section: Shaping and Sintering Of The Ti-3al-25v Powdersmentioning

confidence: 99%

Investigation of the factors influencing the tensile behaviour of PM Ti–3Al–2.5V alloy

Materials Science and Engineering: A

2014

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Titanium, a relatively new engineering metal, has been employed principally in high demanding industries due to its high final cost and it is well known for its biocompatibility. Powder metallurgy (PM) techniques could offer the possibility to reduce the production cost without paying it in terms of mechanical properties, thanks to their intrinsic advantages. In this study the Ti-3Al-2.5V titanium alloy was produced considering two powder production routes and sintered under different temperatures in order to address their feasibility as alternative to the wrought alloy. The results indicate that PM Ti-3Al-2.5V alloys studied have comparable mechanical behaviour as their counterpart obtained by conven-tional metallurgy and, therefore, are potential candidates to fabricate cheaper titanium products for structural applications as well as biomedical devices.