Mo segregation and distribution in Ti–Mo alloy investigated using nanoindentation

Ružić, Jovana; Emura, Satoshi; Ji, Xin; Watanabe, Ikumu

doi:10.1016/j.msea.2018.01.098

Cited by 57 publications

(23 citation statements)

References 31 publications

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“…It is worth noting that pure Ti crystallizes in another allotropic form of body-centered cubic structure similar to Mo, which is named β-phase, in contrast with α-phase of hexagonal structure, stable at room temperature. The transformation of the α-phase into β-phase occurs at 1155 K [17]. However, the addition of Mo promotes the stability of the β-phase at room temperature.…”

Section: Mo-ti Interface Formation Of Mo-ti Solid Solutionmentioning

confidence: 99%

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Expanding Plasma Process for Nitriding Mo–Ti Bilayer Thin Films

et al. 2019

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Owing to the reducing effect of NHx radicals and H species produced in (Ar-N2-H2) expanding plasma, chemical reactions are promoted in thin metal films in contrast with other plasma treatments where the impinging energetic ions play the main role. Multi layers of Mo, Ti, and their nitrides are used in very recent applications such as supercapacitors or solar cells. They combine the interesting properties of the constituents. This work reports on the formation and the structure of Ti nitrides and Mo silicides in Mo–Ti bilayer films coated on Si wafers exposed to (Ar-N2-H2) plasma for 1 to 3 h. Nitrogen diffuses into the surface layers from 400 °C and TiN starts to crystallize from 600 °C. Interdiffusion of Mo, Ti, and Si through Mo–Ti bilayer films gives rise to the formation of Mo–Ti alloys and MoSi2 of hexagonal structure, which transforms into MoSi2 of tetragonal structure at longer treatment durations. A 1 h 30 min plasma exposure at 800 °C leads to the formation of three layers of nearly equal thickness with clear interfaces, which consist of TiN and MoSi2 of nanometric size in the vicinity of the Mo–Ti bilayer film surface.

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Section: Mo-ti Interface Formation Of Mo-ti Solid Solutionmentioning

confidence: 99%

“…hexagonal structure, stable at room temperature. The transformation of the α-phase into β-phase occurs at 1155 K [17]. However, the addition of Mo promotes the stability of the β-phase at room temperature.…”

Section: Mo-ti Interface Formation Of Mo-ti Solid Solutionmentioning

confidence: 99%

Expanding Plasma Process for Nitriding Mo–Ti Bilayer Thin Films

et al. 2019

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“…The composition of the grain is Ti 79.35 Fe 10.16 Sn 8.25 Mo 2. 24 . In fact, the grain in the region labeled P1 is a particle mainly containing the β-Ti phase in Figure 2a,b; for the particle containing Ti phase, according to EDS analysis, the contents of Ti, Sn, and Mo elements are larger than those of Ti, Sn, and Mo elements in Ti 75 Fe 19 Sn 5 Mo 1 nominal component.…”

Section: Microstructure Of Ti-fe-sn-mo Alloysmentioning

confidence: 99%

“…To ensure the correctness of the measured results, the surface of each sample was polished to mirror-finish. Based on a Berkovich indenter, the calculated E r values were used [24]:…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Rapidly Solidified β-Type Ti–Fe–Sn–Mo Alloys with High Specific Strength and Low Elastic Modulus

Jia

et al. 2019

Metals

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The microstructure and mechanical properties of rapidly solidified β-type Ti-Fe-Sn-Mo alloys with high specific strength and low elastic modulus were investigated. The results show that the phases of Ti-Fe-Sn-Mo alloys are composed of the β-Ti, α-Ti, and TiFe phases; the volume fraction of TiFe phase decreases with the increase of Mo content. The high Fe content results in the deposition of TiFe phase along the grain boundary of the Ti phase. The Ti 75 Fe 19 Sn 5 Mo 1 alloy exhibits the high yield strength, maximum compressive strength, large plastic deformation, high specific strength, high Vickers hardness, and large toughness value, which is a superior new engineering material. The elastic modulus (42.1 GPa) of Ti 75 Fe 15 Sn 5 Mo 5 alloy is very close to the elastic modulus of human bone (10-30 GPa), which indicating that the alloy can be used as a good biomedical alloy. In addition, the large H/E r and H 3 /E r 2 values of Ti 75 Fe 19 Sn 5 Mo 1 alloy indicate the good wear resistance and long service life as biomedical materials. Metals 2019, 9, 1135 2 of 18 strength and ductility of the Ti-Fe-based alloys [15-19]. For example, the (Ti 0.705 Fe 0.295 ) 96.15 Sn 3.85 alloy exhibits high yield strength of 1794 MPa and large plastic deformation of 9.6% [15]; the ductility of the (Ti 0.705 Fe 0.295 ) 93.15 Sn 3.85 Nb 3 alloy can be further improved [19]. The microstructures of the eutectic Ti-Fe-based alloys are composed of β-Ti and TiFe phase [15][16][17][18][19]. Although the content of TiFe phase for the eutectic Ti-Fe-based alloys is lower than that of TiFe phase for the hypereutectic Ti-Fe-based alloys, the content of TiFe phase for the former is still high, which affects the strength and ductility of the Ti-Fe-based alloy. Ternary Ti-Fe-Cu, Ti-Fe-Ta, and Ti-Fe-Co and quaternary Ti-Fe-Sn-Nb hypoeutectic alloys have been reported to further reduce the content of TiFe phase [13,[20][21][22][23]. The Ti 94 Fe 3 Cu 3 alloy exhibits the high tensile strength (1200 MPa) and large percentage elongation of 9%, which is attributed to the formation of micro/nano-structured αand β-Ti phases by the dual-axial forging method [20]. The Ti 80 Fe 14 Sn 3 Nb 3 alloy exhibits the high yield strength of 1.88 GPa, ultimate compressive stress of 2400 MPa, plastic strain of 32.4%; the good mechanical properties are attributed to supersaturated β-Ti phase and the high density of lattice defects that restrict the dislocation motion [12].The microstructures of hypoeutectic Ti-Fe-based alloys are generally composed of β-Ti and α-Ti phases; the strength of the alloys is low and the ductility is high when the alloys are mainly composed of β-Ti phases. When the alloy is eutectic, the alloy is composed of a large number of β-Ti and TiFe phases. The plasticity of the alloy is low because of the high content of brittle TiFe phases. While the alloy is hypereutectic, the alloy is composed of a small number of β-Ti phases and a large number of TiFe phases, and the plasticity of the alloy is low. We have previously reported that Ti 80 Fe 20 i...

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“…Nano-indentation measurements have been used extensively in materials research owing to its non-destructive nature, relatively simple specimen preparation, the ability to extract mechanical properties directly from load-displacement curves, etc. 1,2) Furthermore, it enables the observation and analysis of small-scale deformation, dislocation nucleation, size-dependent plasticity, phase transformation, and surface degradation at elevated temperatures. 37) Recently, high-temperature nano-indentation measurements have been widely employed in industries such as aerospace, automotive, nuclear, cutting tool, and biomaterials.…”

Section: Introductionmentioning

confidence: 99%

Nano-Indentation Measurement for Heat Resistant Alloys at Elevated Temperatures in Inert Atmosphere

et al. 2019

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A new approach of nano-indentation measurements at elevated temperatures has been developed to evaluate a temperature-dependent mechanical behavior of heat resistant alloys on a submicron scale, where the measurement is conducted in an inert atmosphere to prevent the surface oxidation of a sample and heat an indenter passively. The developed approach enables us to perform nano-indentation testing with a diamond indenter in the temperature range of 23³800°C. The developed approach has been applied to gamma single-phase single-crystal of a nickel-based superalloy. Then the degradations of the sample surface and the indenter tip have been discussed in this case.

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Mo segregation and distribution in Ti–Mo alloy investigated using nanoindentation

Cited by 57 publications

References 31 publications

Expanding Plasma Process for Nitriding Mo–Ti Bilayer Thin Films

Expanding Plasma Process for Nitriding Mo–Ti Bilayer Thin Films

Microstructure and Mechanical Properties of Rapidly Solidified β-Type Ti–Fe–Sn–Mo Alloys with High Specific Strength and Low Elastic Modulus

Nano-Indentation Measurement for Heat Resistant Alloys at Elevated Temperatures in Inert Atmosphere

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