Effect of (Ti:B) atomic ratio on mechanical properties of TiB2–Fe composites “in situ” fabricated via Self-propagating High-temperature Synthesis

Ziemnicka-Sylwester, Marta; Li, Gai; Miura, Seiji

doi:10.1016/j.matdes.2014.12.036

Cited by 21 publications

(4 citation statements)

References 30 publications

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“…33) Noticeably, No peaks of TiC and Fe 2 B was observed in the XRD patterns. These two phases were the most reported intermetallic in literatures 11,16,24,28,29) while not desirable in FeTiB 2 system, as they will deteriorate the mechanically properties of composites, especially the existence of the brittle Fe 2 B phase as mentioned in introduction. Besides, no peaks of Fe 2 B also proved that the decomposition of TiB 2 was suppressed, and thus, the thermal stability of TiB 2 in the Fe5Ti alloy was achieved successfully.…”

Section: Microstructure Of Sintered Compactsmentioning

confidence: 99%

“…Self-propagating high-temperature synthesis (SHS) or combustion synthesis is another way reported capable of producing Fe 2 B free Fe/ TiB 2 composites. 24,28,29) One of the striking merits of SHS refers to the extreme high temperature caused by heat generated by an exothermic reaction, promoting the occurrence of mass transfer process. Nevertheless, high porosity and aggregation of the newly formed phases 2528) are inevitably introduced in products, which is not suitable for the underlying application for structural materials where strength is valued extremely.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of 30 vol%TiB2 Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

Matsugi

et al. 2019

Mater. Trans.

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TiB 2 doped Fe system alloys composites as a new generation of novel materials in sustainable society show the great potential in hot work tool steels usage. Compared with SKD61, the new generation materials are focused on improving both thermal conductivity and hardness. For the suppression of TiB 2 decomposition and Fe 2 B formation, monophase BCC structured Fe5Ti alloy powders were fabricated by mechanical allying method. The TiB 2 addition with 30 vol% was selected for the control of hardness. The compacts sintered at 1323 and 1373 K for 0.6 ks consisted of ¡-Fe and TiB 2 with almost 30 vol%, which meant no decomposition of TiB 2 occurred during sintering. The result agreed with the achievement of thermal stability of TiB 2 in Fe5Ti during spark sintering synthesis. The thermal conductivity and Vickers hardness of compacts sintered at 1323 and 1373 K for 0.6 ks were 48.0 W/(m•K), 684.7 HV and 53.5 W/(m•K), 717.5 HV, respectively, which were 2.0, 1.3 and 2.2, 1.4 folds than those (24.0 W/(m•K), 516.0 HV) of SKD61. In addition, the compression strength of two compacts sintered at 1323 and 1373 K were measured to be 1698 and 2591 MPa, respectively. The compact sintered at higher temperature showed better mechanical properties and higher thermal conductivity due to the improvement of densification and interface bonding between Fe5Ti and TiB 2 as proved by the fracture modes in compression tests and the crack propagations in hardness tests. Hence, this work provides a new method for fabricating Fe 2 B free FeTiB 2 composites by powder metallurgy with both improvement of thermal conductivity and hardness in the usage of hot work tool steels.

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Section: Microstructure Of Sintered Compactsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of 30 vol%TiB2 Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

Matsugi

et al. 2019

Mater. Trans.

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“…Cemented borides, TiB 2 –Co [147], TiB 2 –Fe [148,149], and TiB 2 –Cu [150], produced by SHS (thermal explosion mode) + pseudo-HIP (when sand is used as pressure-transmitting medium instead of liquid) exhibited hardness up to 23.5 GPa [147] (2400 HV) for TiB 2 -15 vol.-% Co, and up to 16 GPa [148] (∼1630 HV) for TiB 2 -25 vol.-% Fe. The XRD and electron-probe microanalysis reveal that the Co-based binder is actually intermetallic Ti 3 Co 5 B 2 , while the Fe-based binder can be pure iron.…”

Section: Metal-ceramic Materialsmentioning

confidence: 99%

Self-propagating high-temperature synthesis of advanced materials and coatings

Левашов

Mukas'yan

Rogachev

et al. 2016

International Materials Reviews

302

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Self-propagating high-temperature synthesis (SHS) or combustion synthesis (CS) is a rapidly developing research area. SHS materials are being used in various fields, including mechanical and chemical engineering, medical and bioscience, aerospace and nuclear industries. The goal of the present paper is to provide a comprehensive state-of-the-art review and to analyse a critical mass of knowledge in the field of SHS materials and coatings. We also briefly discuss the history and scientific foundations of SHS along with an overview of the technological aspects for synthesis of different materials, including powders, ceramics, metal-ceramics, intermetallides, and composite materials. Application of CS in the field of surface engineering is also discussed focusing on two main routes for applying SHS to coating deposition: (i) single-step formation of the desired coatings and (ii) use of SHSderived powders, targets or electrodes in the coating deposition processes.

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“…34) However, in the absence of C and O, formation of Fe 2 B is still reported in literatures. 28,35) The reaction mechanism of Fe and TiB 2 is of great importance with regard to the synthesis of FeTiB 2 composites, and hence it will be discussed in this study. In most cases, formation of Fe 2 B is undesirable because it may deteriorate toughness of materials, however, wear resistance of composites can be enhanced significantly.…”

Section: Introductionmentioning

confidence: 99%

Spark Sintering of TiB2 Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations

Matsugi

et al. 2020

Mater. Trans.

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TiB 2 reinforced Fe matrix composites were investigated for their potential as a new generation of hot work tools which are mainly characterized by high thermal conductivity and high hardness in comparison with conventional materials. In this work, Fe30 vol%TiB 2 composites were sintered at 1373 K for different holding times (0, 0.3, 0.6, 1.8 and 3.6 ks). Apart from Fe and TiB 2 , newly formed phases of Fe 2 B and TiC were found in all sintered compacts. A good Fe/TiB 2 interfacial cohesion was confirmed at atomic level at 0 ks, which was due to the occurrence of the special orientation relationship between {110} planes of Fe and f10 10g planes of TiB 2. The observation of dislocations in TiB 2 particles, attributed to the activation of slip systems, showed the plastic deformation ability of TiB 2 at high temperature. The reaction between Fe and TiB 2 was due to TiB 2 dissolution in Fe at 1373 K and different diffusion depth of B and Ti atoms in Fe. Consequently, B directly reacted with Fe, since the solubility of B atoms was low in both ¡-Fe and £-Fe. TiC probably precipitated from FeTiC solid solution along Fe grain boundaries in the cooling stage after sparking sintering, leading to a layer of Fe wrapping around TiB 2. Among all the compacts, the one sintered at 1373 K for 0.6 ks displayed the excellent properties which were comparable in Vickers hardness and 133% higher in thermal conductivity, compared with that of SKD61 as the commonly used practical material. This work provides a new perspective to fabricate a future generation of hot work tools.

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Effect of (Ti:B) atomic ratio on mechanical properties of TiB2–Fe composites “in situ” fabricated via Self-propagating High-temperature Synthesis

Abstract: The TiB₂ -based Fe-matrix cermets with titanium addition (literarily different Ti:B ratio) were fabricated from elemental powders "in situ" using the Self-propagating

Cited by 21 publications

References 30 publications

Synthesis of 30 vol%TiB<sub>2</sub> Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

Synthesis of 30 vol%TiB<sub>2</sub> Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

Self-propagating high-temperature synthesis of advanced materials and coatings

Spark Sintering of TiB<sub>2</sub> Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations

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