Abstract
New Ti-44Al-5Nb-3Cr-1.5Zr (at.%) β-stabilized intermetallic alloy was synthesized by the electron beam casting and afterwards re-solidified by the high-gradient (300 °C cm−1) induction float zone (FZ) technique. FZ-processing led to the ordered microstructure creation consisting of volumetrically prevailing (γ + α2) lamellar colonies separated by minor seam-like γ-granular interlayers, and the least intergranular quota of β(Ti)/B2 phase. The optimum phase balance, submicron interlamellar spacing and preferable alignment of lamellae along the thermal gradient were controlled by FZ-conditions. Unique microstructural adjustment enhances drastically the high-temperature yield strength, Young modulus and creep resistance. Thus the thermal limit of γ-TiAl(Nb,Cr,Zr) structural applicability could be extended from 750–800 °C towards 900–950 °C.
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ACKNOWLEDGMENTS
Authors acknowledge the Russian Ministry of Education and Science grant 11.951.2014/K, and Russian Foundation for Basic Research grant 16-03-00757-a.
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Kartavykh, A.V., Gorshenkov, M.V., Korotitskiy, A.V. (2017). Microstructure/Properties Relationship of Advanced Heat-Resistant Intermetallics TiAl(Nb,Cr,Zr) After Casting and Float Zone Processing. In: Oral, A., Bahsi Oral, Z. (eds) 3rd International Multidisciplinary Microscopy and Microanalysis Congress (InterM). Springer Proceedings in Physics, vol 186. Springer, Cham. https://doi.org/10.1007/978-3-319-46601-9_10
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DOI: https://doi.org/10.1007/978-3-319-46601-9_10
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