In situ reaction synthesis of Ti–TiB composites containing high volume fraction of TiB by spark plasma sintering process

Zhang, Zhao Hui; Shen, Xiang-Bo; Wen, Sai; Ji, Luo; Lee, Shu-Kui; Wang, Fuchi

doi:10.1016/j.jallcom.2010.04.218

Cited by 54 publications

(23 citation statements)

References 38 publications

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“…Peak angular displacements and a new peak at 37.6 o suggest the formation of fcc titanium or an intermetallic phase, e.g. Ti 6 Si 2 B, Ti 3 Si or TiSi 2 ( Figure 3). SEM analyses of the powders show a variety of sizes and morphologies that were obtained with the different processing parameters (Figure 2).…”

Section: Resultsmentioning

confidence: 99%

“…All materials produced in this work can be employed in plasma experiments as sputtering targets in order to evaluate the effects of porosity and production methods on the properties of the respective coatings. Beyond the application as coating, Ti-7.5Si-22.5B samples developed in this work can be used in high performance cutting tools and as abrasive element, as well as other special applications 6 .…”

Section: Discussionmentioning

confidence: 99%

“…These titanium alloys have been used in structural applications at high temperatures and as a protective layer in drilling tools obtained through magnetron sputtering or other techniques [2][3][4] . Furthermore, Ti 5 Si 3 phase has high technological importance 5 , titanium borides present an excellent combination of properties 6,7 and there is limited information about the Ti 6 Si 2 B phase 8 . High-energy ball milling (HEBM) has been used in the processing of complex materials instead conventional melting techniques.…”

Section: Introductionmentioning

confidence: 99%

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Study of Ti-7.5Si-22.5B alloys produced by powder metallurgy

et al. 2014

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Refractory alloys with silicides and borides have been used in high temperature applications because their elevated melting point, good oxidation resistance and high strength-to-weight ratio. The present study approaches the preparation of .5B (at.-%) alloys through high-energy ball milling and sintering. The powders and compacts obtained in these processes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), density measurements, chemical analyses and Vickers hardness. It was verified that silicon and boron powders are dissolved in the titanium during milling with an iron contamination up to 6.0 at.-%. Furthermore, the use of short milling times and alcohol during the final stages of milling increases the powder yield. Such increasing was obtained even with a high rotary speed (300 rpm), which generally creates higher temperatures and consequently more sticking. After sintering of the as-milled powders, it was indentified mainly the Ti+Ti 6 Si 2 B+TiB+Ti 5 Si 3 phases in the Ti-7.5Si-22.5B sintered alloys, which presented hardness values up to 800 HV. The materials produced by the present work can be employed in coating research as sputtering targets.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Ti-7.5Si-22.5B alloys produced by powder metallurgy

et al. 2014

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“…Using a short-time densi cation method can be useful when a ne-grained microstructure is required. SPS process can be used to fabricate metals, ceramics, and composite materials [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of in-situ formed TiB whiskers on microstructure and mechanical properties of spark plasma sintered Ti–B4C and Ti–TiB2 composites

2017

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Abstract. Monolithic titanium, Ti-1 wt% B 4 C, and Ti-2.5 wt% TiB 2 were spark plasma sintered at 1050 C for 5 min under 50 MPa. The e ects of B 4 C and TiB 2 additions on densi cation process, microstructural development, and mechanical properties of titanium were investigated. The results revealed that relative density of undoped as well as B 4 Cand TiB2-doped Ti samples reached s98-99%. X-ray di raction patterns, thermodynamic assessments, and microstructural investigations veri ed the in-situ formation of TiB whiskers in both composite samples as well as the appearance of TiC spheres in Ti-B 4 C composite. However, trace unreacted TiB2 and B4C additives remained in the composites as a result of incomplete chemical reactions due to short-time SPS process. Compared to undoped Ti sample, grain growth was hindered when the sample was doped by B4C or TiB 2 . Elongation, ultimate tensile strength, and Vickers hardness of B 4 C-or TiB 2 -doped samples were higher than those of monolithic titanium, but bending strength of ceramicdoped samples was signi cantly lower, compared to undoped titanium. These outcomes were discussed in detail and related to the presence/formation of several ceramic phases with di erent morphologies in Ti matrix.

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“…Although there are many factors that influence the strength of TMCs, such as the grain size, O and N contents, as well as the amounts and morphologies of the reinforcements Zhang and Chen, 2010;Sun and Li, 2012;Koo and Park, 2012), the strengthening efficiency is accomplished based on the strength of matrix (Meyers and Chawla, 2009), which is always decided by the grain size in the case of pure Ti matrix.…”

Section: Introductionmentioning

confidence: 99%

Pinning Effect of In-Situ TiC<sub>p</sub> and TiB<sub>w</sub> on the Grain Size and Room Temperature Strength of (TiC + TiB)/Ti Composites

Jia

Chen

et al. 2015

KONA

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Abstract(TiC p + TiB w )/Ti composite was firstly prepared by spark plasma sintering (SPS) and hot extrusion from Ti-B 4 C system, and then isothermally heat treated at 400-800 °C for 24 h to study the pinning effect of the in situ formed reinforcements. Microstructure and phase composition was investigated by SEM, XRD and TEM, variation of the grain size of Ti matrix was studied by EBSD analysis, and room temperature strength was also measured after different heat treatments. Results show that, comparing with pure Ti materials, both the grain size of Ti matrix and the room temperature strength of the composite almost keep stable after heat treatments, suggesting the pinning effect of in situ formed TiC p and TiB w is effective to suppress the growth of Ti matrix grains during heat treatments.

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In situ reaction synthesis of Ti–TiB composites containing high volume fraction of TiB by spark plasma sintering process

Cited by 54 publications

References 38 publications

Study of Ti-7.5Si-22.5B alloys produced by powder metallurgy

Study of Ti-7.5Si-22.5B alloys produced by powder metallurgy

Effects of in-situ formed TiB whiskers on microstructure and mechanical properties of spark plasma sintered Ti–B4C and Ti–TiB2 composites

Pinning Effect of In-Situ TiC<sub>p</sub> and TiB<sub>w</sub> on the Grain Size and Room Temperature Strength of (TiC + TiB)/Ti Composites

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