Production of titanium alloys for advanced aerospace systems by powder metallurgy

Henriques, Vinícius André Rodrigues; Campos, Pedro Paulo de; Cairo, Carlos Alberto Alves; Bressiani, José Carlos

doi:10.1590/s1516-14392005000400015

Cited by 74 publications

(20 citation statements)

References 6 publications

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“…Apart from Ti64-PA sintered at 1250°C either 2 hours or 4 hours, relative density values for the Ti-6Al-4V alloy ranges between 95% and 96%, similar to that obtained by other authors using elemental titanium sponge powders blended with elemental powders [18][19][20][21] or master alloys [20,22,23].…”

Section: Relative Densitysupporting

confidence: 85%

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

Bolzoni

Ruiz-Navas

Gordo

2013

Materials & Design (1980-2015)

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A comparison between the properties achievable by processing the Ti-6Al-4V alloys by means of two powder metallurgy approaches, precisely prealloyed and master alloy addition, was carried out. Prealloyed and master alloy addition hydride-dehydirde powders characterised by an irregular morphology were shaped by means of cold uniaxial pressing and high vacuum sintered considering the effect of the variation of the sintering temperature and of the dwell time. Generally, the higher the temperature and the longer the dwell time, the higher the relative density and, consequently, the better the mechanical performances.Nevertheless, a higher processing temperature or a longer time leads also to some interstitials pick-up, especially oxygen, which affects the mechanical behaviour and, in particular, lowers the ductility. Although some residual porosity is left by the pressing and sintering route, mechanical properties, thermal conductivity and electrical resistivity values comparable to those of the wrought alloy are obtained.

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Section: Relative Densitysupporting

confidence: 85%

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

Bolzoni

Ruiz-Navas

Gordo

2013

Materials & Design (1980-2015)

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“…The stability of its properties under dynamic load conditions is also important [5]. The disadvantages of titanium and its alloys include low heat conduction, troublesome processing [6][7][8][9] and high cost of machining [10]. The most commonly used titanium alloy is Ti-6Al-4V.…”

Section: Introductionmentioning

confidence: 99%

Hot Processing of Cast and PM Ti-6Al-4V Alloy

Wojtaszek

Śleboda

Korpała

2016

Archives of Metallurgy and Materials

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Quantitative and qualitative evaluation of the influence of the applied sample morphology as well as parameters of deformation on the microstructure and selected properties of Ti-6Al-4V alloy after deformation was presented. Both cast Ti-6Al-4V alloy and powder compacts were used as the material under investigation. P/M preform was produced from the mixture of elemental powders, by hot compaction. The samples of compacts as well as cast alloy were subjected to plastometric tests under various conditions. The influence of the state of the investigated Ti-6Al-4V alloy on the character of flow curves was determined. The microstructure and hardness after deformation were evaluated and compared. Basing on the results of plastometric tests, the suitable thermo-mechanical parameters of forging of Ti-6Al-4V alloy were determined. The charge was machined from the compacts and from cast material, and both types of forging stock were hot-forged. The microstructure as well as hardness of the forgings were compared.

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“…Equations [3] and [4] indicate that the stresses in the three different regions considered above will be evidently different. The corresponding strains will be also significantly different, as illustrated schematically in the stress-strain curve (Figure 9(b)).…”

Section: Mechanism Of Pore Size Effect On Ductilitymentioning

confidence: 99%

“…[1,2] Research in the past [1][2][3] focused on PM titanium alloys made by two kinds of processes: the blended element (BE) powder process and the pre-alloyed (PA) powder process. It is now common [3,4] that densities approaching the theoretical density can be achieved by proper control of powder and the processing parameters. Tensile ductility of PM titanium alloys is very sensitive to porosity but there is not much quantitative work in this area.…”

Section: Introductionmentioning

confidence: 99%

The Nature of Tensile Ductility as Controlled by Extreme-Sized Pores in Powder Metallurgy Ti-6Al-4V Alloy

Kumar

Chandran

Cao

et al. 2016

Metall Mater Trans A

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Tensile properties of Ti-6Al-4V titanium alloy, sintered by a new process (sintering, phase transformation, and dehydrogenation of titanium hydride compacts, termed HSPT process), were investigated to determine how the sintering pores influence the tensile strength and ductility. It was found that the ductility in the sintered alloy is severely affected by the size of the largest pore, referred here as extreme-sized pore, even when the average volume fraction of porosity is nearly constant between a large number of samples. It is shown that the rapid decrease in ductility, with an increase in the extreme pore size, is caused by strain localization around the extreme-sized pore and early crack initiation. This crack initiation leads to fracture of the plane containing the pore thereby limiting the extent of uniform plastic strain that can be attained before fracture. Interestingly, the strength properties are, however, found to be independent of the size of the extreme-sized pore. The results are explained on the basis of stress concentration and strain localization around the extreme-sized pores. The work also reveals that if the extreme-sized pores are eliminated, PM Ti-6Al-4V alloy with high strength (~1100 MPa) and good ductility (~12 pct), which is easily comparable to a wrought Ti-6Al-4V alloy, can be achieved even at oxygen levels up to 0.4 wt pct.

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Production of titanium alloys for advanced aerospace systems by powder metallurgy

Cited by 74 publications

References 6 publications

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

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

Hot Processing of Cast and PM Ti-6Al-4V Alloy

The Nature of Tensile Ductility as Controlled by Extreme-Sized Pores in Powder Metallurgy Ti-6Al-4V Alloy

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