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Ивасишин, О. М.; Savvakin, Dmytro G.; Froes, F. H.; Бондарева, К. А.

doi:10.1023/a:1021117126537

Cited by 93 publications

(26 citation statements)

References 4 publications

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“…Short-term strength at 400 C of sintered titanium with large amount of oxygen was twice that of titanium without oxygen addition [21]. The presence of the oxygen decreases the ductility of titanium alloys at concentrations above 0.4 wt.% [22]. From such an information, we conclude that impurities introduced during the PM processing limit the use of PM alloys for applications where the ductility is not the primary property required.…”

Section: Introductionmentioning

confidence: 81%

Modification of surface properties of Ti–16Si–4B powder alloy by plasma immersion ion implantation

et al. 2011

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Section: Introductionmentioning

confidence: 81%

Modification of surface properties of Ti–16Si–4B powder alloy by plasma immersion ion implantation

et al. 2011

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“…Studies [8][9][10] have shown that improved sinterability, low porosity, and better mechanical properties can be achieved by this approach. The reduced porosity level in the sintered product has been attributed partly to the hydrogen cleaning of the particle surfaces, during egress, which apparently leads to better sintering.…”

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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“…Thus, the production cost can be reduced further. Ivasishin et al [7] produced Ti-6Al-4V alloy via the BEPM technique using hydrogenated Ti powder without any additional HIP step and obtained a high density (~99%) in the powder alloy after sintering.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and alloying elements distribution between the phases in powder near-β titanium alloys during thermo-mechanical processing

et al. 2012

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Abstract:In the present study, two powder near-β Ti alloys having a nominal composition of Ti-5Al-5Mo-5V-XCr-1Fe (X=1-2, wt.%) were studied. The alloys were produced via the blended elemental powder metallurgy technique using hydrogenated Ti powder. Microstructure evolution and the distribution of the alloying elements between the phases were investigated after each step of thermo-mechanical processing (TMP). Microstructures were refined through the TMP in both alloys. Porosity was reduced with deformation at 1173 K (900°C) in the β phase field. The β →α phase transformation occurred during soaking at 1023 K (750°C) in the α+β phase field. Fragmentation of the continuous grain boundary α occurred by the 40% deformation at 1023 K (750°C). Variation in the concentration of the alloying elements in each phase took place through the diffusion during soaking in the α+β phase field, e.g. exit of β-stabilisers from the α-phase. However, the α phase remained supersaturated with β stabilisers. Deformation had no influence on the distribution of the alloying elements. An additional 1% Cr content slightly affects on the amount of the α phase formed and β grain size, but has no noticeable effect on the distribution of the alloying elements between the phases.

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Cited by 93 publications

References 4 publications

Modification of surface properties of Ti–16Si–4B powder alloy by plasma immersion ion implantation

Modification of surface properties of Ti–16Si–4B powder alloy by plasma immersion ion implantation

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

Microstructure evolution and alloying elements distribution between the phases in powder near-β titanium alloys during thermo-mechanical processing

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