Effect of major alloying elements on microstructure and mechanical properties of a highly β stabilized titanium alloy

Zhao, Yongqing; Xin, Shewei; Zeng, Weidong

doi:10.1016/j.jallcom.2009.03.042

Cited by 64 publications

(19 citation statements)

References 16 publications

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“…The obtained value of residual weighted profile (Rwp) is in between 7.4 % and 9.1 % as well as Goodness of fit (GoF) is lying between 0.9 and 1.6. Ti-25V-15Cr-0.2Si [56] and Ti-30Zr-5Al-3V [57]. Tables 2 and 3 are the summary of the Rietveld analyses, indicating values of lattice parameter, crystallite size and microstrain of the several α and β planes, respectively.…”

Section: X-ray Line Profile Analysis and Phase Transformationmentioning

confidence: 99%

“…The logarithm of work hardening rate, ln(dσ/dε), versus logarithm of true stress, lnσ, is plotted for all the samples in Fig. 7a [56] and [57] for Ti-25V-15Cr-0.2Si and Ti-30Zr-5Al-3V alloys, respectively. As Ti-55521 alloy contains 1 % more Cr, which has a much smaller atomic radius compared to elemental Ti, this results in an expected slightly smaller bcc lattice parameter than that for Ti-55511 alloy.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

Ahmed

Savvakin

Ивасишин

et al. 2013

Materials Science and Engineering: A

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The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti-Al-Mo-V-Cr-Fe alloys AbstractTwo near-β titanium alloys, Ti-5Al-5Mo-5V-1Cr-1Fe and a modified one containing 2 wt% Cr (Ti-5Al-5Mo-5V-2Cr-1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 K s−1 and 1 K s−1) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in β-Ti phase are higher than in α-Ti phase for all cases. In both alloys, slower cooling results in an increase in α volume fraction and promotes morphology of continuous grain boundary α phase. A lower total elongation is obtained in both alloys under slower cooling which could be accounted for by the continuous morphology of α phase. Overall, Ti-5Al-5Mo-5V-1Cr-1Fe displays higher ultimate tensile strength and total elongation compared to Ti-5Al-5Mo-5V-2Cr-1Fe, regardless of the cooling rate. Two near-β titanium alloys, Ti-5Al-5Mo-5V-1Cr-1Fe and a modified one containing 2 wt. % Cr (Ti-5Al-5Mo-5V-2Cr-1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 Ks -1 and 1 Ks -1 ) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in β-Ti phase are higher than in α-Ti phase for all cases. In both alloys, slower cooling results in an increase in α volume fraction and promotes morphology of continuous grain boundary α phase. A lower total elongation is obtained in both alloys under slower cooling which could be accounted for by the continuous morphology of α phase. Overall, Ti-5Al-5Mo-5V-1Cr-1Fe displays higher ultimate tensile strength and total elongation compared to Ti-5Al-5Mo-5V-2Cr-1Fe, regardless of the cooling rate.

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Section: X-ray Line Profile Analysis and Phase Transformationmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

Ahmed

Savvakin

Ивасишин

et al. 2013

Materials Science and Engineering: A

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“…다양한 합금 원소를 첨가하여 고용강화를 이용한 타이타늄 합금의 고강도화 연구가 오랫동안 진행되어 왔다 [7][8][9][10][11][12][13][14][15][16]. 일반적으로 치환형 원소 중 1wt.% 당 고용강화가 가장 큰 원소는 Sn이며 Nb, Ta, Pd 원 소 첨가는 효과가 크지 않는 것으로 보고되고 있다 [8,12].…”

Section: 서 론unclassified

The Effects of Oxygen Content on Microstructure and Mechanical Properties of Ti-Al-Fe-Si-O alloy

Bae¹,

Yeom²,

Park³

et al. 2016

Journal of the Korean Society for Heat Treatment

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The effect of the oxygen content and the annealing temperature on the tensile behavior of the Ti-1.5Al-3Fe-0.25Si-(0.1~0.5)O alloy was investigated. The tensile properties were dependent on the volume fraction of the microstructure constituents, i.e. the equixed α, equixed β and lamellar α. The results showed that the O-partitioned equixed α had a much higher strength compared to the equixed β. The strength of the lamellar α increased with increasing the annealing temperature because the O content of the lamellar α increased. Ti-1.5Al-3Fe-0.25Si-0.3O alloy annealed to 900 o C where the volume fraction of lamellar α was the highest exhibited an excellent combination of the strength (1198.5 MPa) and ductility (27.5%). The effect of the lamellar α on the ductility was discussed.

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“…The average β grain size was slightly coarser in the Ti-55511 alloy after steps I to III in comparison with the Ti-55521 alloy. Zhao et al [14] reported the effect of Cr on reducing the β grain coarsening in Ti-25V-15Cr-0.2Si alloy compared to Ti-25V-10Cr-0.2Si alloy. No β grain growth was observed after step III because residual pores as well as the α phase presented at this stage prevented it.…”

Section: Distribution In Beta (β) Phasementioning

confidence: 99%

“…In this work, a traditional Ti-5Al-5Mo-5V-1Cr-1Fe (VT22) alloy was chosen as it is produced via the cost effective BEPM method using powder for the first time and a modified VT22 (Ti-5Al-5Mo-5V-2Cr-1Fe) alloy was also selected since the Cr content controls the grain size during heat treatment in the β phase field [14], as well as reduces the amount of α phase [15,16] formed during soaking in the α+β phase field resulting in improved ductility [17]. However, if more Cr (≥ 2 wt.…”

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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Effect of major alloying elements on microstructure and mechanical properties of a highly β stabilized titanium alloy

Cited by 64 publications

References 16 publications

The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

The Effects of Oxygen Content on Microstructure and Mechanical Properties of Ti-Al-Fe-Si-O alloy

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

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