Effect of boron on microstructure and mechanical properties of multicomponent titanium alloys

Okulov, Ilya; Sarmanova, M. F.; Волегов, А. С.; Okulov, Artem; Kühn, U.; Skrotzki, Werner; Eckert, J.

doi:10.1016/j.matlet.2015.06.017

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…Comparing samples without B 4 C, the same trend was observed in the hardness and Young's modulus values (Figure 8). Therefore, this verified how, from different starting powders and diverse reactions phenomenon, the final properties could be, to some extent, similar; other authors have reported some positive or negative effects on the mechanical behaviour of the titanium alloys with other intermetallic additions [35,36].…”

Section: Physical and Tribological Propertiessupporting

confidence: 79%

Reaction Layer Analysis of In Situ Reinforced Titanium Composites: Influence of the Starting Material Composition on the Mechanical Properties

Montealegre-Meléndez

Arévalo

Beltrán

et al. 2020

Metals

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This study aims at the analysis of the reaction layer between titanium matrices and reinforcements: B 4 C particles and/or intermetallic Ti x Al y . Likewise, the importance of these reactions was observed; this was particularly noteworthy as regard coherence with the obtained results and the parameters tested. Accordingly, five starting material compositions were studied under identical processing parameters via inductive hot pressing at 1100 • C for 5 min in vacuum conditions. The results revealed how the intermetallics limited the formation of secondary phases (TiC and TiB) created from the B and C source. In this respect, the percentages of TiB and TiC slightly varied when the intermetallic was included in the matrix as prealloyed particles. On the contrary, if the intermetallics appeared in situ by the addition of Ti-Al powder in the starting blend, their content was lesser. The mechanical properties values and the tribology behaviour might deviate, depending on the percentage of the secondary phases formed and its distribution in the matrix.

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Section: Physical and Tribological Propertiessupporting

confidence: 79%

Reaction Layer Analysis of In Situ Reinforced Titanium Composites: Influence of the Starting Material Composition on the Mechanical Properties

Montealegre-Meléndez

Arévalo

Beltrán

et al. 2020

Metals

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“…In the present work, the diameter and length ranges for needle-like TiB particles are around 30-50 nm and 0.7-1.5 μm, respectively and the average width of the α-Ti grains is 0.75 μm. The titanium grain refinement observed in the Ti-TiB composite compared to that of CP-Ti is mainly related to the rejection of boron during solidification which restricts the growth rate of the primary β-Ti grains [44][45][46]. According to the Ti-B phase diagram [44], solidification of Ti-TiB occurs in the hypoeutectic zone as the boron content was measured by chemical analysis method (inductively coupled plasma atomic emission spectroscopy) to be around 1.5 wt% for the SLMprocessed Ti-TiB material.…”

Section: Resultsmentioning

confidence: 99%

Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Attar

Ehtemam-Haghighi

Kent

et al. 2017

Materials Science and Engineering: A

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237

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Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the nanoindentation load, H and Er were decreased. Comparison of the nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using nanoindentation and the wear evaluation from conventional wear tests

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“…Massive fractured TiBw and microcracks around TiBw were shown in the SEM image ( Figure 5c) far away from the fracture surface., and the crack path included lots of cracks along TiBw and β grains boundaries in the SEM image (Figure 5d) near the fracture surface. These observations indicate that TiBw fractured with the accumulation of load transfer due to the inherent brittleness of TiBw [17], and then, microcracks emerged in the interface of TiBw and matrix. With further deformation, the cracks extended from microcracks to the β grains boundaries of Ti matrix, leading to the final fracture.…”

Section: Discussionmentioning

confidence: 87%

“…Moreover, Feng et al [16] reported that the growth of the recrystallization primary β was strongly restricted by the TiBw during the extrusion process, which reduced the grain sizes of Ti64. Okulov et al [17] reported that multicomponent Ti alloys was refined by adding boron during casting. The TiB needle-shape particles distributed along primary β-Ti dendrites, and reduced the secondary dendrite arm spacing of the β-Ti phase, resulting in grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement of Ti-15Mo-3Al-2.7Nb-0.2Si Alloy with the Rotation of TiB Whiskers by Powder Metallurgy and Canned Hot Extrusion

Hou

Gao

Cui

et al. 2020

Metals

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In situ synthesized TiB whiskers (TiBw) reinforced Ti-15Mo-3Al-2.7Nb-0.2Si alloys were successfully manufactured by pre-sintering and canned hot extrusion via adding TiB2 powders. During pre-sintering, most TiB2 were reacted with Ti atoms to produce TiB. During extrusion, the continuous dynamic recrystallization (CDRX) of β grains was promoted with the rotation of TiBw, and CDRXed grains were strongly inhibited by TiBw with hindering dislocation motion. Eventually, the grain sizes of composites decreased obviously. Furthermore, the stress transmitted from the matrix to TiBw for strengthening in a tensile test, besides grain refinement. Meanwhile, the fractured TiBw and microcracks around them contributed to fracturing.

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Effect of boron on microstructure and mechanical properties of multicomponent titanium alloys

Cited by 22 publications

References 11 publications

Reaction Layer Analysis of In Situ Reinforced Titanium Composites: Influence of the Starting Material Composition on the Mechanical Properties

Reaction Layer Analysis of In Situ Reinforced Titanium Composites: Influence of the Starting Material Composition on the Mechanical Properties

Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Grain Refinement of Ti-15Mo-3Al-2.7Nb-0.2Si Alloy with the Rotation of TiB Whiskers by Powder Metallurgy and Canned Hot Extrusion

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