Effect of process parameters on hardness and microstructure of graphene reinforced titanium composites

Gürbüz, Mevlüt; Mutuk, Tuğba

doi:10.1177/0021998317745143

Cited by 38 publications

(17 citation statements)

References 20 publications

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“…These properties are directly related with diffusion phenomena. Eqn (2) and Eqn (3) give the effect of the time and temperature on the powder properties [16,17]. As given the Scherer calculations, the crystallite size of the LMO samples are increases with increasing temperature and time.…”

Section: Resultsmentioning

confidence: 99%

Single Step Solid-State Synthesis of Lanthanum Molybdate

Avcıoğlu

Mutuk

Gürbüz

et al. 2019

Advances in Materials Science

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In this study, LaxMoyOz powders were synthesized by a cost-effective solid-state synthesis method. Four different heating cycles were designed to investigate the effects of synthesis temperature and holding time on lanthanum molybdate (LMO) formation, phase assemblies, particle size and morphology. X-Ray Diffraction (XRD) and scanning electron microscopy (SEM) studies were performed to observe crystal structure and particle morphology of synthesized powders. The results showed that nearly ninety percent β - La2Mo2O9 (43,3 nm crystal size) phase was obtained at 1000 °C for 6 h holding time. Longer holding times at 1000 °C favor more oxygen-rich compounds which cause recrystallization of various new crystalline phases. The grain size of the synthesized powder was increased from 0,2 µm to 1,5 µm with increasing holding time. In summary, it is possible to manufacture LMO powders rich in β - La2Mo2O9 by one - step solid - state synthesis method. The phase assembles and particle size of LMO powders could also be tailored by optimization of heat treatment cycle.

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Section: Resultsmentioning

confidence: 99%

Single Step Solid-State Synthesis of Lanthanum Molybdate

Avcıoğlu

Mutuk

Gürbüz

et al. 2019

Advances in Materials Science

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“…As given in Eq. (2), Vickers hardness (H) is directly proportional to the square root of dislocation density [13] (2)…”

Section: Resultsmentioning

confidence: 99%

Grafen-Titanyum (<30μm) Kompozitlerin Toz Metalurjisi Yöntemiyle Üretilmesi: Mikroyapi ve Mekanik Özellikler

Mutuk

Gürbüz²

2019

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Titanium has extraordinary features of any metallic element such as corrosion resistance, strength to density ratio etc. Due to its good features titanium can be used in the composite as a matrix material. Titanium matrix composites (TiMCs) can be used in various industries such as automotive, airplanes and especially biomaterials. Today, as carbon reinforcing material carbon nanotube (CNT), graphite and graphene are used as reinforcing materials. The graphene has the most remarkable properties in this reinforced material due to its extraordinary mechanical features, low friction and high abrasion resistance. Composite materials produced by using titanium and graphene may have remarkable mechanical and microstructural properties. This is conspicuous subject in recent years. In the present study, graphene (Gr) reinforced titanium composites were produced by powder metallurgy method. The effect of various percentages of graphene (0-0,15-0,30-0,45-0,60 wt.%) on the microstructure, density, hardness and compressive strength of Ti composites have been investigated. From the mechanical tests after sintering at 1100 o C for 120min. The highest hardness and the greatest compressive strength were obtained for 0,30 wt.% Gr reinforced composites (520.2 HV and 1137 MPa) when compared to pure titanium (419.8 HV and 780 MPa). The crystal phase and microstructure of the composites were detected by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). Better mechanical properties were observed for Ti-Gr composite materials when compared pure Ti. These kinds of composites promise the future for using especially the field of biomaterials.

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“…These intermetallics have a high hardness of approximately 800.20 HV and 866.46 HV [32,39] , respectively. These hard formations distributed in the ductile matrix, generated zones in which the deformation of the matrix was interrupted by the interaction with these regions of high hardness; in comparison to the matrix (∼40 HV) that contained the mixed phase Cu-Cu(Ti) minority and the grains of Ti (304 HV) [47], that lodge these regions in the limits.…”

Section: Microhardness Of the Materialmentioning

confidence: 99%

Effect of temperature on morphology and wear of a Cu-Ti-TiC MMC sintered by abnormal glow discharge

Bohórquez

Pérez

Sarmiento-Santos

et al. 2020

Mater. Res. Express

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Microstructure and tribological properties had been studied in a Cu-Ti-1%TiC MMC with titanium concentration of 10%, 15%, and 20%. The composite was manufactured following the pulvimetallurgical route that included: mechanical and ultrasonic mixing in 2-propanol, compaction at 400 MPa and sintering assisted by abnormal glow discharge in an atmosphere of 10% nitrogen and 90% argon. The discharge was established in the direct current regime and the voltage values were adjusted according to the sintering temperatures of 750°C and 850°C. The sintering process was carried out for 30 min and then cooled in the same atmosphere. As a result, a differentiated in morphology and wear properties were obtained in the sintered parts. At 750°C a microstructure characterized by the stability of Ti grains with intermetallic precipitates such as CuTi 2 and CuTi were observed at the interface with the matrix. On the other hand, the intermetallic phases as Cu 3 Ti, Cu 4 Ti and CuTi 2 had been detected in the sintered at 850°C. These phases were related to diffusive processes that occurred during the sintering, enhanced by the energy provided by the process. It had been observed that with increase of titanium content an improvement of the MMC tribological properties. In titanium contents of 20% at 750°C was estimated a wear coefficient of 2.7 × 10 −8 mm 3 .N −1 .m −1 with a track width of 312 μm. Despite the pores originated during the sintering of MMC at 850°C was found a wear coefficient value of 2.4 × 10 −8 mm 3 .N −1 .m −1 and a track size of 778 μm, related to the plastic deformation exerted on the porous structures during the wear process. Results of the tribological analysis lead that this compound may be applied in fields where the balance between adequate tribological properties and lightness are highly required such as the automotive, aeronautical and biomedical industries.

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Effect of process parameters on hardness and microstructure of graphene reinforced titanium composites

Cited by 38 publications

References 20 publications

Single Step Solid-State Synthesis of Lanthanum Molybdate

Single Step Solid-State Synthesis of Lanthanum Molybdate

Grafen-Titanyum (<30μm) Kompozitlerin Toz Metalurjisi Yöntemiyle Üretilmesi: Mikroyapi ve Mekanik Özellikler

Effect of temperature on morphology and wear of a Cu-Ti-TiC MMC sintered by abnormal glow discharge

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