Effect of alloying elements on the properties of Ti-Al-Si alloys prepared by powder metallurgy

Knaislová, Anna; Šimůnková, Vendula; Novák, Pavel; Průša, Filip; Cabibbo, Marcello; Jaworska, L.; Vojtěch, Dalibor

doi:10.1016/j.jallcom.2021.159251

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…The addition of C and Si can strengthen γ TiAl alloys by both solid solution and precipitation strengthening mechanisms [55]. To introduce C into the alloy, various powders can be used, such as C, TiC or B 4 C. [56,57], while Si powder is the most commonly used to introduce Si [58,59]. The strengthening mechanisms depend on the solubilities of C and Si in different phases.…”

Section: B C and Simentioning

confidence: 99%

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Liu

Lin

Zhang

et al. 2021

Metals

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Intermetallic gamma titanium aluminides display attractive engineering properties at high temperatures of up to 750 °C. To date, they have been used in low-pressure turbine blades and turbocharger rotors in advanced aircraft and automotive engines. This review summarizes the fundamental information of the Ti–Al system. After providing the development of TiAl alloys, typical phases, microstructures and their characteristics in TiAl alloys, the paper focuses on the effects of alloying elements on the phase boundary shifting, stabilizing effects and strengthening mechanism. The relationships between chemical additions, microstructure evolution and mechanical properties of the alloy are discussed. In parallel, the processing technologies and the common heat treatment methods are described in detail, both of which are applied to optimize the mechanical properties via adjusting microstructures. On this basis, the effects from chemical composition, processing technologies and heat treatments on microstructure, which controls the mechanical properties, can be obtained. It has a certain guiding significance for tailoring the microstructures to gain desired mechanical properties.

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Section: B C and Simentioning

confidence: 99%

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Liu

Lin

Zhang

et al. 2021

Metals

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“…Examples include aircraft structure and aero engines (high strength-to-weight ratio and creep resistance on elevated temperature), bio implants and biomedical devices (superior biocompatibility and excellent corrosion resistance), and equipment used in chemical processing industries (corrosion resistance) [4]. Pure titanium is strengthened by adding different alloying elements such as Al, Si, Zr, Cu, Fe, Ni, Nb, and Sn [5][6][7][8][9][10][11][12][13][14][15]. Titanium alloys can be categorized into three groups: α type, β type, and α+β type.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, thermal, electrical, and corrosion properties of microwave-sintered Ti-0.8Ni-0.3Mo/TiB composites

et al. 2023

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In this study, Titanium boride (TiB) reinforced Ti-0.8Ni-0.3Mo/XTiB (X=5, 10, 15, and 20 wt.%) composites were successfully fabricated by microwave sintering assisted powder metallurgy process. Scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analyses were used to evaluate the elemental powders individually. The distribution of TiB particles in the sintered Ti-0.8Ni-0.3Mo composites was observed using optical microscopy (OM) and SEM. The Microhardness of the microwave-sintered samples was evaluated through Micro Vicker’s hardness testing machine. Thermal characteristics were estimated for temperatures ranging from 50 to 250 °C. The electrical conductivity of Ti-0.8Ni-0.3Mo/TiB composites was calculated from the measured resistance values using the four-point probe method at room temperature. The immersion method was performed to estimate the corrosion properties by suspending the sintered samples in 3.5% NaCl solution for 60 h. The morphology of the corroded surfaces was examined using SEM. The results revealed that Ti-0.8Ni-0.3Mo/15TiB possessed optimum hardness values from 220 to 260 HV, mechanical properties such as True yield strength from 728 to 814 MPa, ultimate compression strength from 1335 to 1680 MPa, fracture strain of 6.12 to 13.81 %. It also revealed less weight loss in a corrosion medium of 0.6 g. The Ti-0.8Ni-0.3Mo/TiB composites had good properties in densification aspects, which is suitable for applications such as marine and airfare components.

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“…Since intermetallic compound has a series of superior chemical, physical, and mechanical properties, recent years it attracts lots of attentions to researchers in the areas of porous metallic membranes [19][20][21][22][23][24]. Basing on mechanisms of preparation and pore formation, four common methods of porous intermetallic compounds were summarized and reviewed by Jiang Yao [6]: (1) sintering preparation based on physical process mechanism of pore formation; (2) violent reaction process to form pores; (3) the formation of Kirkendall pores; (4) the pore formation by phase transition process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fe doping on preparation of Ti-Si porous membrane via in-situ reactive process

Liu

Zhao

et al. 2023

Preprint

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Asymmetric porous filter element can reach a high filtering accuracy with larger filtration flux, which can enhance the filtration efficiency and reduce the energy consumption when it was applied in separation equipment. A novel porous material of Ti-Si intermetallic compound micro-porous membrane was successfully synthesized with Fe doped Ti mixed powder and SiO2 by the in-situ reactive sintering process. Effects of Fe doping, sintering temperature and the external load pressure on the formation of membrane were systemically studied. The results show that increasing Fe doping amount can celebrate the in-situ reactive process and promote the membrane formation. The synthesized granules on the membrane are well distributed with the size of 1∼3 µm, and the thickness of the membranes is 4∼7 µm. The relative air permeability coefficient of porous membrane reduces raptly with increasing either Fe doping amount, or sintering temperature and the external load pressure. All synthesized membranes show the presence of Ti5Si3 and Ti phases, with a little amount phase of FeTi and FeO. The membrane formation mechanism is due to the large reduction reactivity of Fe doped Ti powder with SiO2, and the asymmetric porous structure of Ti5Si3/Ti was obtained finally.

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Effect of alloying elements on the properties of Ti-Al-Si alloys prepared by powder metallurgy

Cited by 13 publications

References 43 publications

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Mechanical, thermal, electrical, and corrosion properties of microwave-sintered Ti-0.8Ni-0.3Mo/TiB composites

Effects of Fe doping on preparation of Ti-Si porous membrane via in-situ reactive process

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