Abstract
Oxygen strongly reduces the tensile ductility of niobium between 400 and 1000 K. Because two basically different brittle fracture modes and ductile rupture (microvoid coallescence) are competitive in this range the overall fracture process can be complicated and lead to mixed fracture morphologies. Oxygen concentration, strain rate and temperature are important parameters. The brittle modes are cleavage which requires a high stress level and Troiano slew strain rate embrittlement fracture involving oxygen diffusion and thus favored by slower strain rates and higher temperatures. Dynamic strain aging is important at the lower end of the embrittlement range where it increases the work hardening and raises the stress to the cleavage fracture stress.
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© 1985 Martinus Nijhoff Publisher, Dordrecht
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Watson, P.G., Reed-Hill, R.E. (1985). On the Embrittlement of Niobium by Oxygen. In: Krausz, A.S. (eds) Time-Dependent Fracture. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5085-6_22
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DOI: https://doi.org/10.1007/978-94-009-5085-6_22
Publisher Name: Springer, Dordrecht
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