Microstructure and Mechanical Properties of a New Ti–1.5Al–1Fe–7.2Cr Alloy Produced with Conventional Cast and Wrought Approach

Markovsky, P.E.; Ikeda, Masahiko; Ueda, Mikito; Bondarchuk, V. I.

doi:10.15407/mfint.41.10.1315

Cited by 4 publications

(4 citation statements)

References 10 publications

(16 reference statements)

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“…As the amount of Mo addition increased, the electrical resistivity and electrical resistance decreased, and the HV increased. A comparison between the Ti-Mo and Ti-Fe alloys suggests that this trend is reasonabl 5,6) . Furthermore, in all cases, the electrical resistance showed a negative temperature dependence.…”

Section: Stq Statementioning

confidence: 96%

Influence of Substitution of Fe by Mo on Heat Treatment Behavior in Ti-Mo-Fe Alloys

Mizuta

Miyake

Ikeda

et al. 2021

MSF

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In order to reduce the cost of β-type Ti alloys, the use of Fe as an alloying element has been studied. However, Fe is known to have a very high diffusion coefficient in β-Ti of about 2.6×10-12 m2/s at 1200 K, and its behavior during heat treatment is expected to be difficult to control. By contrast, Mo, which is also a β-stabilizing element, has a diffusion coefficient of only about 2.5×10-14 m2/s at 1200 K, i.e., roughly 100 times smaller than that of Fe1), 2). In this study, the effect of the partial substitution of Fe with Mo on the aging behavior of β-Ti alloys was investigated using X-ray diffraction, electric resistivity, and Vickers hardness measurements. Ti-Mo-Fe alloys were solution-treated by holding at 1173 K for 3.6 ks and then quenching in ice water. In the X-ray diffraction patterns for the resulting samples, only peaks associated with the β phase were identified. It was found that the electrical resistivity and Vickers hardness decreased with increasing Mo content. As the Mo-to-Fe ratio increased, the decrease in electrical resistivity and the increase in Vickers hardness occurred later during the isothermal aging process. This was due to a delay in isothermal ω-phase precipitation.

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Section: Stq Statementioning

confidence: 96%

Influence of Substitution of Fe by Mo on Heat Treatment Behavior in Ti-Mo-Fe Alloys

Mizuta

Miyake

Ikeda

et al. 2021

MSF

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“…2b). The regimes of subsequent thermomechanical processing and heat treatments were chosen basing on the technological approaches developed in [16,[22][23][24]. Machined semiproducts were subjected to 3D pressing at initial temperature of 1100 °C (Fig.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The results of tensile tests of all program materials are presented in Table 5. Data for the Ti-1.5Al-1Fe-7.2Cr alloy (lines 17-19) with somewhat higher chromium content [23,24] were added for comparison to illustrate the influence of C Mo above 10 wt.%. Typical examples of engineering tensile stress-strain curves for alloys #3 and #4 are given in Fig.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Microstructure and Tensile Properties of Cost-Efficient Thermally Hardenable α + β Alloys of Ti–Al–Mo–Fe and Ti–Al–Mo–Cr Systems

Markovsky

Akhonin

Berezos

et al. 2020

Metallogr. Microstruct. Anal.

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Four new compositions of titanium alloys of Ti-Al-Mo-Fe and Ti-Al-Mo-Cr systems with content of β-phase stabilizing elements in a range of 3.8-9.8 wt.% (in terms of "molybdenum equivalent" C Mo ) were studied. The alloys were melted by single-melt electron-beam cold hearth technique, thermomechanically processed, and subjected to conventional (in furnace) or continuous rapid (resistant heating by electric current) heat treatments with different regimes. The microstructure, phase composition, and mechanical properties both in as-deformed state and after heat treatments were studied in detail. It is found that the proposed thermomechanical processing allows to obtain a transformed microstructure characterized by nearly equiaxed α-phase particles with relatively small aspect ratio and weak crystallographic texture of a basal type. Subsequent annealing in the α + β field led to completion of the α + β microstructure transformation; a microstructure of globular type was obtained in the low-alloyed (C Mo = 3.8%) material. The phase transformations at various stages of strengthening heat treatments and their influence on the final microstructure and properties were studied, depending on the content of β-stabilizing elements and processing route. Particular attention was paid to the influence of the content of β-stabilizing element on the mechanical properties, as well as to the difference between the alloying systems with iron or chromium. It is shown that the alloys of proposed compositions provide high strength and reliability; they are competitive with conventional commercial alloys in terms of the balance of mechanical properties in hot deformed, annealed, and thermally strengthened states. Strengthening treatment based on rapid heating allows to achieve strength above 1500 MPa with sufficient ductility.

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“…The addition of aluminum in Ni-Ti alloy researched by Pavel Salvetr et al showed the decrease of porosity and improvement of corrosion resistance and hardness [33]. Aluminum (Al) addition is due to its distinctive characteristics, such as low density (2.7 g/cm 3 ) and combination of moderate strength and high ductility, thermal conductivity, electric conductivity, corrosion-resistance [34,35].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Titanium Alloy Obtained by Powder Metallurgy

et al. 2022

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Ti-based alloys are an important class of materials suitable especially for medical applications, but they are also used in the industrial sector. Due to their low tribological properties it is necessary to find optimal technologies and alloying elements in order to develop new alloys with improved properties. In this paper, a study on the influence of sintering treatments on the final properties of a titanium alloy is presented. The alloy of interest was obtained using the powders in following weight ratio: 80% wt Ti, 8% wt Mn, 3% wt Sn, 6% wt Aluminix123, 2% wt Zr and 1% wt graphite. Two sintering methods were used, namely two-step sintering (TSS) and multiple-step sintering (MSS), as alternatives to conventional sintering which uses a single sintering dwell time. Evolution of sample morphology, composition and crystalline structure with sintering method was evidenced. The lower values for the friction coefficient and for the wear rate was attained in the case of the sample obtained by TSS.

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Microstructure and Mechanical Properties of a New Ti–1.5Al–1Fe–7.2Cr Alloy Produced with Conventional Cast and Wrought Approach

Cited by 4 publications

References 10 publications

Influence of Substitution of Fe by Mo on Heat Treatment Behavior in Ti-Mo-Fe Alloys

Influence of Substitution of Fe by Mo on Heat Treatment Behavior in Ti-Mo-Fe Alloys

Microstructure and Tensile Properties of Cost-Efficient Thermally Hardenable α + β Alloys of Ti–Al–Mo–Fe and Ti–Al–Mo–Cr Systems

Characterization of Titanium Alloy Obtained by Powder Metallurgy

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