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| DYNAMIC TENSILE PROPERTIES OF Ti-47Al-2Mn-2Nb ALLOY |
| WANG Yu; LIN Dongliang (T. L. Lin) (Department of Materials Science; The Open Laboratory of Education Ministry for High-Temperature Materials and Tests; Shanghai Jiao Tong University; Shanghai; 200030)ZHOU Yuanxin; XIA Yuanming (Department of Modern Dynamics; University of Science and Technology of China; Hefei 230026)C. C. Law (Materials and Mechanics Engineering; United Technologies Company-Pratt & Whittney 400 Main Street; East Hartford; CT 06108; U. S. A.)Correspondent: LIN Dongliang; professon; Tel: (021)62812544(O); (021)62835352(H);Fax:(021)62820892; Email: dllin@mail.sjtu.edu.cn. |
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Cite this article:
WANG Yu; LIN Dongliang (T. L. Lin) (Department of Materials Science; The Open Laboratory of Education Ministry for High-Temperature Materials and Tests; Shanghai Jiao Tong University; Shanghai; 200030)ZHOU Yuanxin; XIA Yuanming (Department of Modern Dynamics; University of Science and Technology of China; Hefei 230026)C. C. Law (Materials and Mechanics Engineering; United Technologies Company-Pratt & Whittney 400 Main Street; East Hartford; CT 06108; U. S. A.)Correspondent: LIN Dongliang; professon; Tel: (021)62812544(O); (021)62835352(H);Fax:(021)62820892; Email: dllin@mail.sjtu.edu.cn.. DYNAMIC TENSILE PROPERTIES OF Ti-47Al-2Mn-2Nb ALLOY. Acta Metall Sin, 1998, 34(9): 908-914.
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Abstract Room-temperature tensile properties of Ti-47Al-2Mn-2Nb alloy with near lamellar (NL) microstructures were investigated at the strain rates between 20 and 1000 s-1 using a self-designed Split-Hopkinson tensile bar setup with a rotating disk. And a comparison was made between static and dynamic tensile properties. It was found that tensile ductility fluctuates within a narrow range with the variation of the strain rate f dynamic elongation is almost the same as the static elongation. But dynamic strengths (d) of the alloy and their strain rate sensitivity are obviously higher than those under static strain rates, and there exists linear relationship between static strength (s) and the logarithm of the strain rate(s= A + Blu), and between d and the strain rate itself(d = C + D). Fractography analysis indicates that the alloy fractures in a mixed mode of predominant transgranular cleavage and minor intergranular cracking under static and dynamic strain rates. Environmental effect is excluded from the main cause for the room-temperature brittleness of the investigated alloy.
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Received: 18 September 1998
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