Pressure-less and current-activated pressure-assisted sintering of titanium dual matrix composites: Effect of reinforcement particle size

Patel, Vishnu V.; El‐Desouky, A.; Garay, Javier E.; Morsi, K.

doi:10.1016/j.msea.2008.11.046

Cited by 49 publications

(19 citation statements)

References 13 publications

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“…Even with much more TiB content, the hardness values of the PS samples are similar to those reported in previous work 1 . However, hardness and densification increase significantly when HP is used, as shown in previous research using current-activated pressure-assisted sintering (CAPAS) [7] . Densification of the Ti-7.5Si-22.5B powders was improved due to the use of powders milled for only 1 hour comparing with HP of elemental powders without milling 20 .…”

Section: Resultsmentioning

confidence: 67%

“…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: 67%

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…The boron source required to form TiB can be added in the form of B 4 C, TiB 2 , or other additives. It was reported that the in-situ formation of TiB whiskers in the spark plasma sintered Ti matrix composites remarkably a ects the microstructure and mechanical properties [24][25][26][27][28][29].…”

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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“…Therefore, the decreases in tensile strength and wear resistance of TMCs are related to the agglomeration of reinforcements caused by the high volume fraction of reinforcements. Although the degree of TiB agglomeration is strongly sensitive to the particle size and shape of the Ti powder, there have been very few studies on the effects of the agglomeration of reinforcements on the tensile properties of TMCs (Patel et al, 2009, Chicosha et al, 2014 .…”

Section: Introductionmentioning

confidence: 99%