Microstructure and mechanical properties of consolidated gamma titanium aluminides

Kothari, Kunal; Radhakrishnan, R.; Wereley, Norman M.; Sudarshan, T. S.

doi:10.1179/174329007x186471

Cited by 27 publications

(7 citation statements)

References 29 publications

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“…It can be observed that the workpiece material is mainly composed of α2+γ layered clusters at room temperature after hot isostatic pressing and aging treatment. In addition, there are equiaxed crystal γ and bright gray equiaxed crystal α2 in the lamellar microstructure, and a small amount of B element exists in the form of fine TiB2 whisker hard reinforcing phase, improving the materials mechanical properties [31]. Prior to the grinding test, the workpiece material was machined into a standard test piece (20 mm × 18 mm × 15 mm) suitable for ultrasonic device via the wire electrical discharge machining method.…”

Section: Workpiece Materialsmentioning

confidence: 99%

Grindability of γ-TiAl intermetallic compounds during ultrasonic vibration-assisted high efficiency deep grinding process

Wang

Tang

Zhao

et al. 2023

Int J Adv Manuf Technol

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Gamma titanium-aluminum intermetallic compounds (γ-TiAl) have an important application significance in the field of aero-engines owing to their excellent mechanical properties (e.g., high-temperature resistance, high toughness, etc). Grinding as an important method was used to realize the high efficiency and precise machining for difficult-to-cut materials. However, the machining defects (e.g., adhesion, cracks, and even burns, etc) were confronted on machined surface of γ-TiAl materials under high grinding force and temperature loads. In this case, the new machining methods combined with the ultrasonic vibration and high-efficiency deep grinding technology was proposed to improve the machining quality and efficiency. Comparative trials of ultrasonic vibration-assisted high efficiency deep grinding (UVHEDG) and high efficiency deep grinding (HEDG) were carried out to study the grinding performance, in terms of the grinding force, grinding temperature, specific grinding energy, and machining surface quality. Results show that UVHEDG possess the lower grinding force and temperature by 38.69% and 39.05% compared with HEDG, respectively. In addition, the employment of ultrasonic vibrations contributes to maintain the abrasive sharpness, and thus the specific grinding energy is reduced by 23.95%. Ground surface roughness can be reduced by 19.53%, and the grinding surface quality is effectively improved due to the lubrication effect and track overlap effect under ultrasonic vibration.

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Section: Workpiece Materialsmentioning

confidence: 99%

Grindability of γ-TiAl intermetallic compounds during ultrasonic vibration-assisted high efficiency deep grinding process

Wang

Tang

Zhao

et al. 2023

Int J Adv Manuf Technol

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“…Also, the α 2 phase present in TiAl alloys is significantly decreased by Nb additions, decreasing its oxygen solubility [54]. Although Nb was primarily used for improving oxidation resistance [167], other high-temperature properties such as strength and creep resistance have been enhanced by the presence of Nb.…”

Section: Effect Of Alloy Modifications On the Oxidation Resistance Of Tialmentioning

confidence: 99%

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

Mogale¹,

Matizamhuka²,

Cobbinah³

2022

Corrosion - Fundamentals and Protection Mechanisms

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This research paper summarises the practical relevance of additive manufacturing with particular attention to the latest laser powder bed fusion (L-PBF) technology. L-PBF is a promising processing technique, integrating intelligent and advanced manufacturing systems for aerospace gas turbine components. Some of the added benefits of implementing such technologies compared to traditional processing methods include the freedom to customise high complexity components and rapid prototyping. Titanium aluminide (TiAl) alloys used in harsh environmental settings of turbomachinery, such as low-pressure turbine blades, have gained much interest. TiAl alloys are deemed by researchers as replacement candidates for the heavier Ni-based superalloys due to attractive properties like high strength, creep resistance, excellent resistance to corrosion and wear at elevated temperatures. Several conventional processing technologies such as ingot metallurgy, casting, and solid-state powder sintering can also be utilised to manufacture TiAl alloys employed in high-temperature applications. This chapter focuses on compositional variations, microstructure, and processing of TiAl alloys via L-PBF. Afterward, the hot corrosion aspects of TiAl alloys, including classification, characteristics, mechanisms and preventative measures, are discussed. Oxidation behaviour, kinetics and prevention control measures such as surface and alloy modifications of TiAl alloys at high temperature are assessed. Development trends for improving the hot corrosion and oxidation resistance of TiAl alloys possibly affecting future use of TiAl alloys are identified.

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“…Titanium aluminides show excellent high-temperature mechanical properties, as well as good corrosion and oxidation resistance, thus are great candidates for hightemperature applications [1,2]. Furthermore, their low density ( ∼ 3.7 g cm −3 ) [3] can be of great advantage for the production of gas turbine engines, exhaust valves and turbocharger rotors [4,5]. Despite the interesting high-temperature properties, some drawbacks hinder a wider application of titanium aluminides, especially when production costs are imperative.…”

Section: Introductionmentioning

confidence: 99%

Sinterability and microstructure evolution of powder metallurgy processed titanium aluminides

Silva

Quaglio

Monfardini

et al. 2023

Materials Science and Technology

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The objective of this study was to assess the effect of different aluminium additions in microstructure evolution and hardness of powder metallurgy processed titanium aluminides. Alloys with aluminium contents of 10, 20, 30, 40 and 45 at.-% were prepared using mixtures of elemental powders that were cold uniaxially pressed. Sintering was conducted at 1300 and 1400°C for 2 h under argon atmosphere. The results indicated a sharp decrease in sinterability for larger elemental aluminium additions. Furthermore, the hardness values decreased with the aluminium content due to the higher porosity. However, in alloys with higher aluminium content, despite the higher porosity, microstructural homogeneity was improved and equilibrium phases α2-Ti3Al and γ-TiAl could be achieved in fully lamellar Ti-40Al and Ti-45Al.

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Microstructure and mechanical properties of consolidated gamma titanium aluminides

Cited by 27 publications

References 29 publications

Grindability of γ-TiAl intermetallic compounds during ultrasonic vibration-assisted high efficiency deep grinding process

Grindability of γ-TiAl intermetallic compounds during ultrasonic vibration-assisted high efficiency deep grinding process

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

Sinterability and microstructure evolution of powder metallurgy processed titanium aluminides

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