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Experimental results
Published in B. A. Greenberg, M. A. Ivanov, S. V. Kuz’min, V. I. Lysak, Explosive Welding, 2019
B. A. Greenberg, M. A. Ivanov, S. V. Kuz’min, V. I. Lysak
Orthorhombic titanium aluminides were chosen because of their inherent complex strength properties, including high values of specific strength (strength/density ratio), good plasticity at room temperature, fracture toughness, high creep and oxidation resistance [18, 19]. For orthorhombic aluminides of certain compositions, it is also possible to obtain good tensile properties, which is unusual for TiAl and Ti3Al [20, 21]. The excellent combination of the strength properties inherent in the orthorhombic titanium aluminides gives reason to hope for their successful use in designing bimetallic joints. Particularly attractive is the possibility of implementing as one of the phases a disordered solid solution, which, with its increased ductility and toughness, can serve as a damping element in the structure of a multiphase alloy based on intermetallic compounds.
Self-Lubricating Ceramic Matrix Composites
Published in Emad Omrani, Pradeep K. Rohatgi, Pradeep L. Menezes, Tribology and Applications of Self-Lubricating Materials, 2017
Emad Omrani, Pradeep K. Rohatgi, Pradeep L. Menezes
Li et al. [134] studied the sliding wear of TiAl intermetallics against steel and ceramics of Al2O3, Si3N4, and WC/Co. They found that sliding wear property of titanium aluminide was strongly dependent on the counterface materials. Cheng et al. [135] investigated the effect of TiB2 on dry-sliding tribological properties of TiAl intermetallics. They observed that the wear resistance increased dramatically, but the friction coefficient was not related to the addition of TiB2. In addition, several investigations showed that titanium aluminides had poor tribological behaviors that would limit their applications [136,137]. Hence, the addition of effective solid lubricants becomes an excellent solution to obtain the TiAl matrix materials with good tribological behaviors over the wide temperature range. Cheng et al. [138] investigated the tribological behavior of a Ti–46Al–2Cr–2Nb alloy under liquid paraffin lubrication against AISI 52100 steel ball in ambient environment and at varying loads and sliding speeds. Nevertheless, only several studies have been done on the tribological behavior of TiAl intermetallic materials at elevated temperatures. The fretting wear behavior of a Ti–48Al–2Cr–2Nb alloy was investigated in air from RT to 600°C [139]. Tribological behavior of a Ti–46Al–2Cr–2Nb alloy was investigated against a Si3N4 ceramic ball at a constant speed of 0.188 m/s and an applied load of 10 N from 20°C to 900°C [138,140]. Consequently, it is necessary to further investigate the elevated temperature tribological behavior of TiAl-based intermetallic materials.
Synthesis and Characterization of Copper–Ruthenium Composites
Published in Ajay Kumar Mishra, Lallan Mishra, Ruthenium Chemistry, 2018
Rasidi Sule, Iakovos Sigalas, Joseph Kwaku Ofori Asante, Peter Apata Olubambi
Nickel and titanium aluminide systems have been widely used for high-temperature structural applications due their strength, high oxidation and corrosion resistance, and high melting point (Bora et al., 2004). The application of these alloy systems at high temperature is limited by their poor room temperature ductility and fracture toughness (Bora et al., 2004). In order to overcome these challenges, a material with high strength at room and elevated temperatures as well as room temperature ductility and toughness could be incorporated.
Temperature rise in workpiece and cutting tool during drilling of titanium aluminide under sustainable environment
Published in Materials and Manufacturing Processes, 2018
Nithin Tom Mathew, Vijayaraghavan Laxmanan
Table 1 shows the detailed result of surface roughness of drill tool at various locations for the fresh tool, drill tool after HAR dry, wet, and MQL condition. In all the conditions, it is observed that the roughness values at region 1 were found be higher when compared to region 2 and region 3. This might be due to the intense contact of the chip with region 1 when compared to another region. The reduced value of both roughness parameters might be due to the better and effective lubrication capability of the cutting fluid. The reduction in friction is an important factor of concern so as to reduce the temperature rise both in work surface and cutting tool. This could control the thermal damage on the work surface especially the subsurface damages such as the formation of the white layer. In a high-temperature material like intermetallic titanium aluminide, this would greatly help in improving their performance and high-temperature properties. Also, the durability or life of the cutting tool is of huge importance since it increases the overall productivity and reduces the overall production cost. Better lubrication could reduce the tool wear and ensures that the tool performs well throughout the machining period. Hence, the advantages of employing an effective lubrication system like MQL are essential to improve the efficiency of a manufacturing process.
The correlation between structure, multifunctional properties and application of PVD MAX phase coatings. Part III. Multifunctional applications
Published in Surface Engineering, 2020
One widely implemented strategy used to increase jet engine efficiency involves both the improvement of existing oxidation- and corrosion-resistant multiphase metal-alloys [135] and intermetallic compound, such as titanium aluminide [15,135–137], and the development and use of new materials such as bulk MAX Phases [5–7,15,113–115,117,138–152] for hot-section engine components.
Additive manufacturing, the path to industrialisation at CSIRO
Published in Australian Journal of Mechanical Engineering, 2021
Robert Wilson, Shiqin Yan, Christian Doblin, Nazmul Alam, Daniel East, Daniel Liang, Alejandro Vargas-Uscategui, Andrew Urban, Emma Regos, Saden Zahiri, Peter C. King, Stefan Gulizia, Gary Savage, Darren Fraser, Sri Lathabai, Kishore Venkatesan, David Ritchie, Kun Yang, Ling Chen, Geoffrey de Looze
More recent research projects developed machine parameters for high-temperature materials such as cobalt chrome superalloy Co-29Cr-10Ni-7 W, titanium aluminide TiAl, and nickel superalloy, Hastelloy X. A large area of research was the fabrication of chemical mixers from stainless steel, with high surface areas, for use in continuous flow chemical reactors.