Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1576234 | Materials Science and Engineering: A | 2013 | 11 Pages |
Abstract
Body centred cubic (BCC) β-phase multifunctional titanium alloys have been developed with a very unique combination of thermal and mechanical properties. In this investigation, a very low porosity Ti-36.8-Nb-2.7Zr-2.0Ta-0.44O (wt%) alloy was produced by powder sintering, hot forging, solution treatment and cold swaging. X-ray diffraction and transmission electron microscopy (TEM) of the solution treated alloy revealed the presence of a small amount of Ï-phase in a predominantly BCC β-phase matrix. Electron backscatter diffraction (EBSD) of the swaged alloy revealed a highly elongated and fragmented microstructure, and a strong ã110ã fibre texture. TEM also revealed the existence of stress-induced twin lamella, dislocations and Ï-phase. Consistent with previous studies on these types of alloys, the swaged alloy exhibited non-linear elasticity during tensile straining, low elastic modulus (45.4 GPa), high elastic limit (2.3%), high elongation to failure (8.1%), and a high yield strength (880 MPa) and tensile strength (940 MPa). The coefficient of thermal expansion was also low (â¼5Ã10â6 Kâ1 between 50 and 300 °C) in this alloy.
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Physical Sciences and Engineering
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Authors
W. Guo, M.Z. Quadir, S. Moricca, T. Eddows, M. Ferry,