An investigation on dynamic tensile properties of TiAl intermetallic alloy
Room-temperature tensile properties of polycrystalline Ti-47Al-2Mn-2Nb alloy with nearly lamellar (NL) microstructures were investigated at the strain rate between 10{sup {minus}5} and 1,000 s{sup {minus}1} using a self-designed Split-Hopkinson tensile bar setup with a rotating disk and conventional testing machine. It was found that tensile ductility varies within a narrow range with the strain rate while dynamic strengths ({sigma}{sup d}) of the alloy are obviously higher than static strengths ({sigma}{sup s}). There exists a linear relationship between {sigma}{sup s} and the logarithm of the strain rate (ln{dot {epsilon}}), and between {sigma}{sup d} and the strain rate itself ({dot {epsilon}}). Fractography analysis indicated that the alloy fractured in a mixed mode of predominant transgranular cleavage and minor intergranular cracking under static and dynamic strain rates. Environmental effect was excluded from the main cause for the room-temperature brittleness of the investigated alloy.
- Research Organization:
- Shanghai Jiao Tong Univ. (CN)
- OSTI ID:
- 20001599
- Report Number(s):
- CONF-981104-; ISBN 1-55899-458-0; ISSN 1067-9995; TRN: US0000177
- Resource Relation:
- Conference: High-Temperature Ordered Intermetallic Alloys VIII, Materials Research Society Symposium Proceedings, Boston, MA (US), 11/30/1998--12/03/1998; Other Information: PBD: 1999; Related Information: In: High-temperature ordered intermetallic alloys VIII. Materials Research Society symposium proceedings: Volume 552, by George, E.P.; Mills, M.J.; Yamaguchi, Masaharu [eds.], [600] pages.
- Country of Publication:
- United States
- Language:
- English
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