Mechanical and oxidation properties of Ti–xFe–ySi alloys

Lee, D.B.; Park, K.B.; Jeong, Hwan Jeong; Kim, S.E.

doi:10.1016/s0921-5093(01)01670-7

Cited by 31 publications

(13 citation statements)

References 8 publications

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“…Grain-boundary-diffusion creep is the main mechanism of stress relief. 7 The fine-grain structure is generally characteristic of dense, compact and adherent layers.…”

Section: Scalesmentioning

confidence: 99%

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Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Vojtěch¹,

Kubatík²,

Jurek

et al. 2005

Oxid Met

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Titanium was powder siliconized and gas nitrided, in order to improve its cyclic-oxidation resistance. Siliconizing was performed in a pure-silicon powder at temperatures in the range of 800-1100 • C for 3-48 h. Gas nitriding was carried out in pure N 2 at 1100 • C/12 h. Cyclic-oxidation experiments with the siliconized and nitrided samples were conducted in air at 850 and 950 • C for up to 560 h. It was found that the siliconized layers grew according to the parabolic law with the activation energy for siliconizing E S being 47.2 kJ mol −1 . Powder siliconizing at 900-1100 • C/3 h produced multi-phase layers, in which Ti 5 Si 3 silicide predominated The siliconizing temperature of 800 • C/3 h appeared to be insufficient, because it led to a non-uniform surface layer with a slight protective effect. The nitrided layers were composed of titanium nitride TiN and α-Ti(N) intestitial solid solution. Measurement of the oxidation kinetics revealed that the titanium siliconized at 900-1100 • C/3 h oxidized much more slowly than pure Ti, Ti-6Al-4V alloy and nitrided titanium. Microstructural investigation revealed the complex substructure of the scales on the siliconized samples which was composed of rutile+silica, rutile and nitrogen-rich sub-layers. The mechanism of high-temperature cyclic oxidation of the siliconized and nitrided titanium is discussed.

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“…Grain-boundary-diffusion creep is the main mechanism of stress relief. 7 The fine-grain structure is generally characteristic of dense, compact and adherent layers.…”

Section: Scalesmentioning

confidence: 99%

“…Surface alloying seems to be more advantageous than bulk alloying, because silicon strongly modifies the mechanical properties of titanium. [3][4][5][6][7] Besides a reduction of the oxidation rate, [7][8][9][10][11][12] silicon has been shown also to improve wear 13,14 and creep 15 resistance.…”

Section: Introductionmentioning

confidence: 99%

Cyclic-Oxidation Resistance of Protective Silicide Layers on Titanium

Vojtěch¹,

Kubatík²,

Jurek

et al. 2005

Oxid Met

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“…As a low-cost b-Ti stabilizer, Fe has been used in a variety of commercial Ti alloys, including Ti5Al-2.5Fe, Ti-6Al-2Fe, Ti-10V-2Fe-3Al, and Ti-4.5Fe-6.8Mo-1.5Al (in wt pct throughout) and the emerging TIMETAL 54M (Ti-5Al-4V-0.6Mo-0.4Fe) and TIMET-AL 18 (Ti-5V-5Mo-5.5Al-2.3Cr-0.8Fe). [5][6][7][8] In addition, small additions of Fe improve both the machinability and hot workability of Ti alloys such as KS EL-F (Ti-4.5Al-4Cr-0.5Fe-0.15C) and TIMETAL 54M. [7,8] From a PM standpoint, Fe is a fast diffuser in both a-Ti and b-Ti.…”

Section: Introductionmentioning

confidence: 99%

The Sintering, Sintered Microstructure and Mechanical Properties of Ti-Fe-Si Alloys

Yang

Luo

Schaffer

et al. 2012

Metall Mater Trans A

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A systematic study has been conducted of the sintering, sintered microstructure and tensile properties of a range of lower cost Ti-Fe-Si alloys, including Ti-3Fe-(0-4)Si, Ti-(3-6)Fe-0.5Si, and Ti-(3-6)Fe-1Si (in wt pct throughout). Small additions of Si (£1 pct) noticeably improve the as-sintered tensile properties of Ti-3Fe alloy, including the ductility, with fine titanium silicides (Ti 5 Si 3 ) being dispersed in both the a and b phases. Conversely, additions of >1 pct Si produce coarse and/or networked Ti 5 Si 3 silicides along the grain boundaries leading to predominantly intergranular fracture and, hence, poor ductility, although the tensile strength continues to increase because of the reinforcement by Ti 5 Si 3 . Increasing the Fe content in the Ti-xFe-0.5/ 1.0Si alloys above 3 pct markedly increases the average grain size and changes the morphology of the a-phase phase to much thinner and more acicular laths. Consequently, the ductility drops to <1 pct. Si reacts exothermically with Fe to form Fe-Si compounds prior to the complete diffusion of the Fe into the Ti matrix during heating. The heat thus released in conjunction with the continuous external heat input melts the silicides leading to transient liquid formation, which improves the densification during heating. No Ti-TiFe eutectoid was observed in the as-sintered Ti-Fe-Si alloys. The optimum PM Ti-Fe-Si compositions are determined to be Ti-3Fe-(0.5-1.0)Si.

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“…Accordingly, new alloys with high strength and low cost are being developed, e.g., Ti-Si [19], Ti-Fe-Si [20], Ti-Al-Fe [21], and Ti-Fe-Sn [3]. Recently, we have focused on the duplex Ti-5111 alloy because of its price advantage and attractive properties.…”

Section: Introductionmentioning

confidence: 99%

“…In the Ti-5111 alloy system, Al stabilizes the ␣ phase and improves the corrosion and oxidation resistance behavior. Fe is known to be a low-cost ␤ phase stabilizer [20,21]. Cr addition can promote the plasticity of duplex alloys and increases the tendency of Ti to passivate [22].…”

Section: Introductionmentioning

confidence: 99%